Friday, December 29, 2017

Dawn Redwood - Metasequoia glyptostrobboides

Thought to once be extinct until it's rediscovery in 1944, the Dawn Redwood - Metasequoia glyptostrobboides - is the smallest of all Redwoods. Reaching a max recorded height of 200 feet at maturity - it is still a giant tree by normal standards.  It is native only to the Hubei province of China, but is now planted widely as an ornamental in both residential and commercial landscape settings.  Seeds collected from an expedition performed by the Arnold Arboretum of Harvard University were sent in 1948 to all of the botanical institutions that were active at the time.  These seeds were planted in 1948-50 and many remain growing in botanical gardens and parks today.  The largest specimens remaining from this mass seed planting are (1) at The Bailey Arboretum on Long Island, (2) at James Blair Hall in Willamsburg, VA, (2) near Carnegie Lake in Princeton, NJ, (1) at Willow Wood, NJ, (1) Washington Arboretum in Seattle, (1) at the Los Angeles State and County Arboretum, CA.

Image Citation: Gary Kling, University of Illinois, Bugwood.org

Fossils have shown that during the Paleocene and Eocene periods there were vast forests of Dawn Redwood ( and other metasequoia varieties) throughout the northern portion of North America. In Badlands National Park large petrified trunks and stumps of the Metasequoia occidentalis a very similar tree in this same family that is now extinct, make up the major portion of Tertiary fossil plant material in the badlands of western North Dakota. Upon rediscovery the Dawn Redwood was hailed as a living fossil as the taxon was believed to have become extinct during the late Miocene period. This tree is very unique in the fact that it lived along side the Dinosaurs and has survived, a feat that is limited to very living things.

Metasequoia branchlet 02
Image Citation: By Kevmin (Own work) [GFDL or CC BY-SA 4.0-3.0-2.5-2.0-1.0], via Wikimedia Commons

The Dawn Redwood is a fast growing deciduous tree that can grow up to 4 feet in a single year. The leaves are small and feathery and similar in appearance to the Bald Cypress, they are green on top in the Spring changing to and orange to reddish brown in the Fall. It differs from the Bald Cypress in the leaves and shoots being opposite one another, the crown being more open and the individual leaves being larger, broader and opening two months earlier in most areas. Although it is closely related to the Giant Redwoods it is deciduous like the Bald Cypress and often compared to both. It is recommended to be planted in zones 5-8. They make for a great shade tree but be aware when planting that they grow very tall and average 75-100 feet with a spread on average of 25 feet, in most settings. They enjoy full sunlight and grow in a pyramidal shape. Their branches provide great habitat and winter protection for many varieties of animal & birds.  They are available at some larger nurseries, if you can not find one locally they can also be purchased directly from The Arbor Day Foundation

Image Citation: Robert Vidéki, Doronicum Kft., Bugwood.org



Thursday, December 28, 2017

The Sugarberry - Celtis laevigata

The Sugarberry - Celtis laevigata is a small deciduous tree that grows upwards of 95 feet, they often flower and fruit when young. The Sugarberry grows in an upright erect form with an open spreading crown. The simple bark is grey in color and smooth when young, becoming marred with cork or wart like ridges / growths. The bark marking is often caused by bird excavating the bark to access the sweet sap, this in turn attracts insects to the wounds. The leaves are simple and alternate usually thin and paper like in texture, lanceolate or ocassionally ovate with a rounded, flattened or asymmetric tip. The upper surface is pale green and hairless, smooth surfaced with visible veins.

Image Citation: Brian Lockhart, USDA Forest Service, Bugwood.org

The Sugarberry is a member of the Cannabaeceae (Hemp) family. Sugarberry is usually found growing in sandy loam or rocky soils along streams, bottom lands, and in woodlands. The Cannabaceae Family is made up of 11 genera and 180 species of shrubs, trees, herbs and vines - 14 species are found in North America only 9 are native others are naturalized. The woody members of this family are most easily identified by their alternate simple leaves with 3 primary veins from the base and inconspicuous flowers, and were originally classified as members of the Elm family (Ulmaceae) but recent studies suggest they should actually be included with the Cannabaeceae family.

Image Citation: Chris Evans, University of Illinois, Bugwood.org

Sugarberry has long been used for many purposes by a variety of Native American tribes. The Houma used a concentrate made from the bark to treat sore throats and ground up shells to treat venereal diseases. The Comanche would beat the fruits to a pulp and then mixed with animal fat, rolled into balls, and roasted in the fire as food. The Acoma, Navajo, and Tewa all consumed raw Sugarberries for food. The leaves and branches were boiled by the Navajo to make dark brown and red dye for wool.

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Wednesday, December 27, 2017

The Carolina Hemlock - Tsuga caroliniana


Image Citation:William M. Ciesla, Forest Health Management International, Bugwood.org

The Carolina Hemlock is an attractive tree but does not have a high commercial value and is rarely grown ornamentally.   Reaching heights of 60 feet tall it is very similar in appearance to the Eastern Hemlock.  The cone of the Carolina Hemlock is ovoid to oblong, 2.5-4 cm long and 1.5-2.5 cm broad.  The cone scales spread widely as the cone dries out.  The twigs are light brown, smooth and thinly covered with short dark hairs.  The leaves are in the form of 10-20 mm long flat and slightly downcurled needles that spread in all directions from the twig.  

Image Citation: William M. Ciesla, Forest Health Management International, Bugwood.org

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Tuesday, December 26, 2017

The Red Spruce - Picea rubens

The Red Spruce - Picea rubens is a small-mid sized tree that can reach 50-80 feet tall. Red Spruce is a long lived tree that can live to be well over 400 years old. Red Spruce can be found growing from Canada in the North through North Carolina, Tennessee and Georgia in the South. The branches on the Red Spruce are close in proximity to one another, growing straight out from the trunk and gently sweeping upward near the ends. The wood of Red Spruce is light in color and weight, straight grained, and resilient. This type of lumber is used for making paper, construction lumber, and stringed musical instruments.


Image Citation: Keith Kanoti, Maine Forest Service, Bugwood.org

Red Spruce is moneocious, with male and female flower buds occurring on the same tree but different branches, each year in May. The pendant male flowers are bright red while the female flowers are erect and bright green in color with a hint of purple. The seeds are small and winged, borne in cones. Cones mature from about mid-September to early October, the autumn following flowering. Cones are 1.3 - 1.5 in long, light red-brown, with rigid, rounded scales that are slightly toothed on the edges. Cones are receptive to pollen only when fully open, a condition which lasts briefly for only a few days. The needles are easily identified, they are shiny yellow-green on all sides and point out in all directions very much like porcupine quills. The needles are stiff 3/8 - 5/8 inch long, sharply pointed, four sided and awe shaped.


Image Citation: Georgette Smith, Canadian Forest Service, Bugwood.org

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Friday, December 22, 2017

Why do we decorate "Christmas Trees"?

The custom of the Christmas tree developed in early modern Germany with predecessors that can be traced to the 16th and possibly even the late 15th century. Customs of erecting decorated trees in wintertime can be traced to Christmas celebrations in Renaissance-era guilds in Northern Germany and Livonia. Fir trees have been traditionally used to celebrate winter festivals by both Pagan's and Christian's for thousands of years. Pagans used Fir branches to decorate their homes during the winter solstice, as it reminded them to think ahead to Spring. The Romans used Fir Trees to decorate their temples at the festival of Saturnalia. Christians use it as a sign of everlasting life with God. A Christmas tree is a decorated tree, usually an evergreen conifer such as pine or fir, traditionally associated with the celebration of Christmas.





Image Citation (Photo 1, 2 and 3): Amy Gilliss, Arundel Tree Service

Each year, 33 to 36 million Christmas trees are produced in America, and 50 to 60 million are produced in Europe. In 1998, there were about 15,000 growers in America (a third of them are "choose and cut" farms, which allow buyers to select their tree before cutting it down). In that same year, it was estimated that Americans spent $1.5 billion on Christmas trees. Some trees referred to as living Christmas trees, are sold live with roots and soil, often from a nursery, to be stored in planters or planted later outdoors and enjoyed (and often decorated) for years or decades to come. In the past, Christmas trees were often harvested from wild forests, but now almost all are commercially grown on tree farms. Almost all Christmas trees in the United States are grown on Christmas tree farms where they are cut after about ten years of growth and then new trees are planted to begin the cycle again. Christmas trees are a large attraction for small mammals, birds and spiders as they provide nesting and shelter.

Image Citation (Photo 3 - Christmas Tree Farm) David J. Moorhead, University of Georgia, Bugwood.org

Though the why of decorating a Christmas tree may remain the same, the ways to go about doing it are limitless. Today you are not just limited to a classic evergreens with white or multi colored lights.  Artificial trees have become very popular over the last few decades and are considered by most to be more enviromentally friendly (until they end up in landfills at least...).  You can now purchase thousands of different sizes, colors, styles, themes and materials of artificial trees some even come with built in lights.   For those of us who are a bit more tech savvy, lights can even be programmed to music and come in colors beyond the basic rainbow. The options are as endless as our imaginations, maybe this year your family will out-decorate the Griswold family!  ;-)

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Thursday, December 21, 2017

Eastern White Pine - Pinus strobus

White Pines - Pinus strobus are a large growing evergreen with blue-green needles that are generally 2 1/2-5 inches long.  The needles grow very densely on the branches.  Pines are different from other conifers/evergreens, their needles grow in sheathed groups of 2,3 or 5.  It is a tall tree with straight gray-brown trunk and horizontal growing branches.  The cones are small and slender rarely growing longer then 3-6 inches.  White Pines can live on average 200-250 years although there are a few recorded to be over 400 years old.  Growing about 3 feet per year between the ages of 15-45, but at a slower rate in the juvenille and mature stages before and after that point-they can reach heights well over 150 feet tall, one record holder came in at 207 feet (The Boogerman Pine).  


The White Pine has a very wide growth range from the North Eastern United States through Southeastern Canada, this is the only five needled Pine that grows East of the Rocky Mountains.  Another five needled Pine found in the United States is the Sugar Pine, this is only found in the West. Thought to have originally covered most of the Eastern United States, there are only 1% of the original old growth forests remaining, after the extensive logging operations that occured in the early 20th century.  It is found in the neartic temperate broadleaf and mixed forests biome of Eastern North America.  Prefering well drained/sandy soils and humid climate, it also performs well in boggy areas and rocky highlands.  This tree towers over most others including many broadleaf hardwoods and provides food and shelter to many small mammals and numerous forest birds.



                                      


Image Citation: Steven Katovich, USDA Forest Service, Bugwood.org


Wednesday, December 20, 2017

Arborvitae - Thuja occidentalis

Arborvitae - Thuja occidentalis is monoecious evergreen tree that generally reaches heights of 40-50 feet tall, although it has the potential to grow much taller.  It is a native northern Cypress with scale like leaves, flattened twigs that are grouped in fan shaped sprays with bilaterally symmetric cones.  Found mostly on limestone - derived soils, in swamp areas, riparian areas on cliff and talus from 0-900 m.  It is common from Ontario and New Brunswick in the north, south through the Appalachians of North Carolina and Tennessee.  It is also commonly called Northern White Cedar, American Arborvitae, Eastern Arborvitae, or Cedar Blanc.


Image Citation: Richard Webb, Bugwood.org


The bark of the Arborvitae is Red-Brown in color and becomes gray with age.  The bark is thin and fibrous becoming fissured and forming long strips with age.  The pollen cones are 1-2 mm long reddish in color. The seed cones are ovoid 9-14 mm long, green maturing to brown with 2 pairs of woody, fertile scales, each one is longer then it is wide.  The leaves are scale like, flattened 1-4 mm long, 1-2 mm wide, pointed and dull yellow-green on the upper and lower surface with visible glands and lateral leaves near twig tips.


Image Citation: Franklin Bonner, USFS (ret.), Bugwood.org

It is written that in 1536 an extract from the foliage of the Arborvitae saved the lives of Jacques Cartier and his crew who were suffering from scurvy during their second discovery voyage to Canada,  they in turn named the tree Arborvitae which is Latin for "tree of life".  They brought the tree home with them to Europe, making it the first North American tree to be introduced to Europe.   Since that time, there have been more then 120 cultivars discovered and named.  This sheer number makes it one of the most popular trees in horticulture today.  Arborvitae is one of the longest lived trees in Eastern North America, it can live up to 1890 years.


Image Citation: Rob Routledge, Sault College, Bugwood.org

Arborvitae is a very common planting in both residential and commercial settings.  It is recommended for hardiness zones 3-7 and holds it foliage year round.  This tree adapts very well to both shearing and shaping and naturally grows in a pyramidal shape.

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Tuesday, December 19, 2017

The Atlantic White Cedar - Chamaecyparis thyoides

The Atlantic White Cedar - Chamaecyparis thyoides is a small cedar with irregular rounded cones.  It is also known regionally as the Post Cedar or the Swamp Cedar.  It is a member of the Cupressaceae (Cypress) Family.  A monoecious evergreen tree that grows to up to 120 feet tall on rare occasions but averages 40-60 feet tall.  It generally appears with a single straight trunk and spire shaped crown.  The tree mostly occurs in bogs and swamps or in highly acidic soils, they also form pure stands within forests dominated by other species.  It appears naturally along the Atlantic coastal plain from Maine to South Carolina and along the Gulf Coast Plain from Florida to Mississippi. 

Image Citation: Karan A. Rawlins, University of Georgia, Bugwood.org

The bark is flaky at first becoming a red-brown with age, often furrowing into long spirals with thin peeling strips.  The branches become fan shaped sprays with age that are flattened.   The leaves are scale like and slightly overlapping often with a small rounded resin gland, the stomata form a white X on the lower surface.  The seeds appear in cones, they are rounded but generally not symmetrical.  When mature the cones are relatively small only 4-9 mm wide and long.  They are either bluish-purple to reddish-brown, glaucous, not very resinous and made up of 6-8 woody scales. The cones mature and open within 1 year, within the cones the seeds occur 1-2 per scale and are 2-3 mm long with a narrow wing.  It is monoecious, but the staminate and pistillate flowers are produced on separate shoots.  The flowers appear in the summer but are so small they often are unnoticed by the untrained eye, they remain on the tree untill late fall or early winter.
Image Citation: Keith Kanoti, Maine Forest Service, Bugwood.org

The Atlantic White Cedar has become a very popular ornamental, with over thirty cultivars on the market today. The climate throughout most of the range of Atlantic White Cedar is classed as humid but varies widely in all other aspects. It is recommended for hardiness zones 3a-8b.  Average annual precipitation needed is 40 to 64 in and is best distributed throughout the year. The frost-free season required for optimum growth is 140 to 305 days. Temperature extremes range from -36° F during Maine's winter to highs of over 100° F during the Summer seasons in the Southern range.  It is often times confused with other similar appearance trees such as the Arborvitae (Thuja occidentolis) which also has branches forming fan like sprays and the Port Oxford Cedar (Chamaecyparis lawsoniana) an ornamental found commonly in the East.  The wood is very light and decay resistant but has not been logged heavily since the 20th century. 

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Friday, December 15, 2017

Top ten Christmas tree varieties

When visiting a Christmas tree farm, nursery or even the pop up/fenced side of the road lot (you know the one, it has the giant blow up snowman/santa waiting to greet you) one can often be overwhelmed by the selection of Christmas trees available for purchase. There are dozens of options when choosing a tree, we have compiled a list of the top ten trees and a little about each one to help make your choice a little easier. The top five trees are very close in sales numbers based on my research, their position on the list varies based on each particular region.

Fraser Fir (Abies fraseri), is the most popular Christmas tree sold in the United States: it has deep green colored short and flat needles. The aroma is considered by many to be strong and very long lasting. Fraser fir is a uniformly pyramidal shaped tree which reaches a maximum height of about 80 feet and a diameter of 1-1.5 feet. The strong branches are turned slightly upward which gives the tree a compact appearance and makes for good ornament support. Needled retention is very good on this variety. Fraser Fir has been used less for timber then other Fir varieties, because the difficult terrain on which it grows makes it tought to harvest. The wood is soft and brittle and may be used for pulpwood, light frame construction, interior knotty paneling, and crates.

Fun Fact: Fraser fir boughs have often been used for "pine pillows" and bed stuffing. This is a very interesting way of introducing the scent of fir to your home.

Image Citation: Bill Cook, Michigan State University, Bugwood.org

Balsam Fir (Abies balsamea), is a close second to the Fraser as they are very similar to one another. Balsam grows in an upright pyramidal form. The needles are flat and long lasting. On lower branches needles occur in two rows along sides of the branch, 3/4 - 1 1/2 inches long, spreading in form and not crowded. On older branches, the needles tend to be shorter and curved upward covering the upper sides of the twigs.

Fun Fact: The Balsam was named for the resin (also called balsam) that is found on the bark ridges and wounds, this resin was used during the civil war to treat wounds.

Image Citation: Steven Katovich, USDA Forest Service, Bugwood.org

Douglas Fir (Pseudotsuga menziesii), is also very close in numbers sold to the Balsam and Fraser. It is very fragrant with good needle retention. The needles are dark green to blue in color and range from 1 to 1 1/2 inches long. Needles are soft to the touch and radiate out in all directions from the branch. They have a sweet fragrance when crushed.

Fun Fact: The Douglas Fir is not a true Fir (not related), it has it's very own classification (Pseudotsuga).

Image Citation: Dave Powell, USDA Forest Service (retired), Bugwood.org

Colorado Blue Spruce (Picea pungens Engelm.), is fourth in the top ten best sellers. It has dark green to powdery blue 1-3 inch long needles. It is well known to be the best for needle retention. The Colorado Blue Spruce is often sold balled and burlaped as a "live" tree to be planted after the holiday and enjoyed for many years to come. When young it grows in a nice pyramidal form, often spreading in form with age.

Fun Fact: The Colorado Blue Spruce is the state tree of both Colorado and Utah.
Image Citation:  Richard Webb, Bugwood.org
Scotch (Scots) Pine (Pinus sylvestris), is the most popular Christmas tree in the Pine family and the only to make the top ten. The dark green needles are 1-3 inches long and are retained on the tree even when completely dry. The scent is not as strong as some of the Firs but is very long lasting.
Fun Fact: The Scotch (Scots) Pine is currently the most commercially planted Christmas Tree in the United States.

Image Citation: Howard F. Schwartz, Colorado State University, Bugwood.org

Eastern Red Cedar (Juniperus virginiana), is a favorite in the Southern portion of the United States. It has dark green, shiny needles that are prickly to the touch. The branches are compact and form a pyramidal crown, except in older trees where the shape is more broadened. The leaves are usually arranged in opposing pairs along the branchlets. It is a very popular choice on most "cut your own" farms. The Eastern Red Cedar is a very aromatic option.

Fun Fact: The Eastern Red Cedar is not a true cedar, it is actually a member of the Juniper (Juniperus) family.
Image Citation: Howard F. Schwartz, Colorado State University, Bugwood.org

White Spruce (Picea glauca (Moench) Voss), is a regional favorite in the North Eastern United States and Canada. It has one of the best "wild" shapes on "cut your own" farms. The needles are a bluish-green in color and are poorly retained by the tree once it is cut. When crushed the needles have a unpleasant odor. The thick limbs hold ornaments (even heavy ones) very well.

Fun Fact: The White Spruce is the state tree of South Dakota
Image Citation: Bill Cook, Michigan State University, Bugwood.org

White Pine (Pinus strobus), must be mechanically trimmed to make into the pyramidal shape desired for most Christmas trees. It is most poular in the Mid-Atlantic United States (where it is commonly/naturally grown). The weaker limbs do not hold ornaments very well. This variety is very popular with allergy sufferers who can not handle the stronge aromas of most Christmas trees. Needles are soft, flexible, bluish-green to silver green in color and are regularly arranged in bundles of five. Needles are 2 1/2-5 inches long and are usually shed at the end of the second growing season. The White Pine has great needle retention with little to no noticable fragrance. White Pine lumber is has always been very valuable. The soft, light colored wood warps and checks less than many other species. The wood is used to craft cabinets, interior trims, and for carving.

Fun Fact: Early Native Americans used the inner bark as a food source, later colonists used the inner bark as an ingredient in cough remedies.

Image Citation: Steven Katovich, USDA Forest Service, Bugwood.org

White Fir (Abies concolor), is sometimes mistaken for a Pine as it has the longest needles of all Fir trees. The narrow needles are around 1 - 1 ½ in. in length and occur in rows. They have good foliage color, good needle retention, and a pleasing shape and aroma. White fir has one of the largest ranges of any of the Western Firs. It can be found from the Rocky Mountains in Colorado and New Mexico to the Coast Range in California and Oregon.

Fun Fact: The lumber from the White Fir is used for decking, pulp production, plywood, framing, crating, beams, posts and mobile home construction.
Image Citation: Paul Wray, Iowa State University, Bugwood.org

Virginia Pine (Pinus virginiana), is the newest list maker and has not been used as a Christmas tree for nearly as long as the others. It is an alternate to the Scotch Pine in the South and has become the most affordable Christmas tree variety in that same region. The needles are a dark green to gray and are supported by stout branches, these branches hold even heavy ornaments very well. They are fast growers and can be harvested as Christmas trees in as little as 3-5 years. Thought they have many benefits that make them popular on downside is they must be mechanically shaped to have a pyramidal form.

Fun Fact: The Virginia Pine is a rapid grower, often times even considered to be somewhat invasive growing in some not very favorable locations. This rapid growth and hardiness gives it an edge when planted on sites that have been recently clear cut or even mined.

Image Citation: Vern Wilkins, Indiana University, Bugwood.org

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Thursday, December 14, 2017

Laurel Oak (Darlington Oak) - Quercus hemisphaerica

The Laurel Oak (Darlington Oak) - Quercus hemisphaerica, is a large semi-evergreen that can reach upwards of 80 feet tall.  Due to it's semi-evergreen nature the tree slowly loses leaves throughout the winter months but still has some green leaves remaining in the Spring season when the new leaves begin to appear.  The Laurel Oak is most often planted as an ornamental tree.  Naturally the Laurel Oak is found growing in waterways and bottom lands where the ground remains moist .  Although it prefers wet areas, it can still preform well in dry soils.  Naturally the Laurel Oak is found growing along the Coastal Plain from Southeastern Virginia up the Mississippi River floodplain to Kentucky. 


Image Citation: Chris Evans, University of Illinois, Bugwood.org

Even in the Winter season, the leaves are the fastest way to identify the tree.  The leaves are narrow and long, 2-4 inches long and 1/2 to 1 inch wide and may be rounded or tapered before flaring out gently along the length of the blade.  The rough bark pattern becomes smoother on the upper trunk and along the major limbs.  Unlike most Oaks the leaves of the Laurel Oak easily break when bent.  The acorn is 1/2 inch long and almost perfectly rounded, 1/4 of the nut is enclosed by a saucer shaped cup.  Acorns take two full years to mature.  


Image Citation: Chris Evans, University of Illinois, Bugwood.org

Very similar to the Diamondleaf Oak, although the leaves differ on the lower surfaces, vein axils and habitat.  The Bluejack Oak is another similar species however their leaves have a blue or gray tint.  

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Common Whitebeam -Sorbus aria

There are multiple varieties of Whitebeams that are used in various settings most of which have simply shaped slightly rounded and broad leaves. Whitebeams are Old World trees native to the Northern Parts of the Eurasian landmass, from the British Isle to Japan.  The Common Whitebeam -Sorbus aria - also called the Chess-Apple is native to southern England and parts of Central Europe.The Lutescens which is used as a street tree because of it's tight egg shaped crown. The Majestica which is mainly found in France and has larger leaves. The Himalayan - Sorbus cuspidata is a vigorous tall growing tree, with thicker and longer leaves with shallow toothing and slight lobing.  The Wilfred Fox(a hybrid of the common and the Himalayan) this variety is strictly upright and does not have red fruit as the others do. The Finnish Whitebeam -Sorbus thuringiaca  (unknown origin) also a hybrid has a very different appearance then all of the other Whitebeams, it's leaves are not simply shaped they are instead deeply lobed or pinnate with 1-2 separate leaflets at the base of each leaf.  


Image Citation: Zelimir Borzan, University of Zagreb, Bugwood.org

Whitebeams are moderate sized trees, growing as tall as 60+ feet.  They withstand the harsh conditions of street type locations in European city suburbs.  The leaves are generally simply shaped, rounded and broad (except on the Finnish, theses are deeply loped) Green above and silver below.   The fruits appears in bunches of small berries, depending on the variety the berries are red, orange or sometimes brown.  The flowers are generally small and white in color, bisexual and usually arranged in large, branched corymbs, except on the Himalayan their flowers are larger and have a strong scent similar to the Hawthorn.  Flowers on the Whitebeams are smaller in size and number then the Mountain Ash, the berries also occur in lesser numbers.



Image Citation: Robert Vidéki, Doronicum Kft., Bugwood.org

Whitebeams are not commonly found growing in the United States as they are not native to our area.  When found they are primarily planted in park settings or as specimen trees but never growing wild.  

Wednesday, December 13, 2017

Winged Elm - Ulmus alata

The Winged Elm - Ulmus alata, is a small to medium sized deciduous tree that reaches heights of less then 50 feet tall and usually not more than 1.5 feet in diameter. The Winged Elm has a generally wide, rounded crown that is made up of long slender branches many of which are winged with wide, cork like ridges on either side making the tree easier to identify.  It is sometimes also referred to as the Cork Elm or Wahoo.  Winged Elm is common in the Southern portion of the United States and can be found easily from Virginia south through Florida and West through Texas.

Image Citation: Joe Nicholson, Bugwood.org

The bark of the Winged Elm is thin, irregularly shaped, with rough flat plates, shallow fissures and light gray in color. When shaved or peeled back the bark will reveal thin bands f dark and off white thin inner layers. The leaves are 1.5-3 inches long and 1-1.5 inches broad, with evenly spaced coarse teeth that are divided by smaller thinner teeth in between. One side of each leaf is wider then the other, with the thin yellow vein appearing off center on each leaf. The leaves are a bright green in color and can be either smooth or rough on the upper surface, while the lower surface is always smooth.  In the fall the leaves turn a lovely bright yellow and sometimes a coppery brown.

Image Citation: Chris Evans, University of Illinois, Bugwood.org

The Winged Elm is a small tree and can be used in both commercial and residential settings. Since it is a relatively small tree it does not have value as far as lumber production is concerned. It is also not a desired firewood as the grain of the tree is interlocking and very difficult to split by hand. The Winged Elm has not been recorded to be affected by Dutch Elm disease, a disease that has been deadly to most Elm varieties. Recommended for hardiness zones 6a-9b.

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Tuesday, December 12, 2017

Broadleaf Mistletoe - Phoradendron spp

Broadleaf Mistletoe (Phoradendron spp.) is an evergreen plant that is parasitic in nature, it grows freely on a variety of large landscape trees. Some deciduous host trees of broadleaf mistletoe include Apple, Ash, Birch, Boxelder, Cottonwood, Locust, Maple, Oaks Walnut and Zelkova to name a few. Conifers are not found to often be host of the Broadleaf variety, but can host the dwarf varieties.


Mistletoe plants often develop in rounded form and can reach upwards of two feet in diameter. The plants develop small whitish colored berries that are sticky to the touch. Mistletoe plants are leafy and evergreen becoming most visible in the winter when the deciduous host trees have dropped their leaves. The plants are either female (berry producers) or male (pollen producing only). Many birds feed on the berries and excrete the living seeds which stick to any branch they land on. Older and large trees are often the first to be infested because birds prefer to perch on higher limbs. The down side of this is a heavy build up of mistletoe is most likely to occur in these same larger trees as the birds enjoy feeding on the berries of the mature Mistletoe plants. Often times growths in the upper branches will drop seeds to the lower sections below, spreading the growth even more. Dwarf Mistletoe does not spread in the same way as Broadleaf, instead it's seeds are forcibly discharged from the fruit, dispersing up to 40 feet away.

Image Citation: Paul A. Mistretta, USDA Forest Service, Bugwood.org

Once a seed is in place the seed will germinate, during this time it will begin to grow through the bark of the tree and into the tree's water conducting tissues. Within the tissues, structures similar to roots form, they are called haustoria. Haustoria will spread as the parasitic bush grows and spread. Young growths are slow growing and may take years before they bloom for the first time, their succulent stems become woody over time at the base of each growth. Even if an entire visible growth is removed from it's host plant, it will often resprout directly from the haustoria that is embedded into the host. On the other hand dwarf mistletoe is not woody when mature and is segmented with small scale-like leaves.

Image Citation: Randy Cyr, Greentree, Bugwood.org

Mistletoe can be harmful to a tree that is already weakened but generally does not harm normal, healthy trees. It is possible for individual limbs and branches from healthy trees to become weak or die back. In instances of heavy infestation the entire tree may be stunted, weakened or killed if there are other factors such as disease or drought.

The most effective way to control mistletoe is to remove the infested branches, this will eliminate the haustoria which will prevent re-sprouting. Infested branches must be cut at least 1-2 feet from the base of attachment to be sure you are removing all of the haustoria from the inner tissues of the host. In cases of heavy infestation it may be recommended to remove the entire tree as you can not safely remove more then a portion of the trees crown without causing severe damage or death to the tree itself. If you are not able to prune the tree to eliminate the growth, completely removing the visible mistletoe growth annually will often help limit the spread as only mature growths can produce seeds.

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Monday, December 11, 2017

Paw Paw - Asimina triloba

The Paw Paw (Asimina triloba) is a small deciduous fruit bearing tree that is native to North America.  They grow wild in much of the eastern and midwestern portions of the country, but not in the extreme North, West or South.   

Image Citation (Photos 1 & 2): Rob Routledge, Sault College, Bugwood.org 

The leaves are green in the growing season and an elongated oval shape ranging in size from 10-12 inches long.  In the fall the leaves change to a rusty yellow in color.  When crushed the leaves have a strong unique odor, often compared to that of a bell pepper.  The leaves contain toxic annonaceous acetogenins, making them impalatable to most insects. The one exception is the Zebra Swallowtail Butterfly.  

The flowers have 3 prominent triangular shaped green, brown or purple outer petals.  The flowers are insect pollinated, but fruit production is often limited by the small number of pollinators that are actually attracted to flowers very faint scent.  
Image Citation (Photo 3): Wendy VanDyk Evans, Bugwood.org

The fruit is a green-brown in color and a curved cylindrical shape - the shape of the fruit is very similar to a fat lima bean.  The trees produce an almost tropical fruit with vanilla or banana/mango flavors. When ripe, the fruit’s soft flesh is very creamy in texture. The large seeds are easy to remove, making the pawpaw an excellent pick for fresh eating.  The short shelf life makes it an uncommon find in most market areas.   Fresh fruits of the Paw Paw are generally eaten raw, either chilled or at room temperature. However, they can be kept only 2–3 days at room temperature, or about a week if refrigerated.  

Many animals and insects make use of the Paw Paw tree and it's fruit.  The flowers attract blowflies, carrion beetles, fruit flies, carrion flies and other bettle varieties.  The fruits of the Paw Paw are enjoyed by a variety of mammals, including raccoons, foxes, opossums, squirrels, and black bears. Larvae of the Zebra Swallowtail Butterfly, feed exclusively on young leaves of Paw Paw.  Chemicals in the Paw Paw leaves offer protection from predation throughout the butterfly's life remaining in their systems and making them unpalatable to predators.  Whitetail deer do not feed on the Paw Paw.

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Friday, December 8, 2017

Catawba Rosebay - Rhododendron catawbiense

Catawba Rosebay - Rhododendron catawbiense is distinguished by it's large pink flowers and evergreen leaves with bases that are rounded. It is an evergreen shrub or small tree that reaches heights of only 9-22 feet tall. It grows in a shrubby fashion, often branches closest to the ground. It is native to Mountain slopes, ridges, balds from 500-2000 rarely at lower altitudes. Found from Virginia and West Virginia south to North Georgia, west to Kentucky and northeast Alabama.

Image Citation: Charles T. Bryson, USDA Agricultural Research Service, Bugwood.org

The bark of the Catawba Rosebay is smooth when young, becoming furrowed and shredding with age. The leaves are alternate, simple, narrowly broad and elliptic. In extreme cold or drought the leaves often curl under. The upper leaf surface is a dark lustrous green in color, while the lower surface is a paler green. The flowers are considered to to be a corrolla Pink in color and are in a broad bell shape that can reach up to 6 cm in diameter. The petals and sepals number 5 each with 10 stamens, flowers occur in early Summer annually. The fruit is a linear or oblong capsule that is covered with red-brown hairs, the fruit occurs on erect stalks and mature between late Summer and early Fall.

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Thursday, December 7, 2017

The West Indian Almond - Terminalia catappa

The West Indian Almond - Terminalia catappa, is a deciduous tree that reaches heights of around 75 feet.  It grows in an erect form, generally with a single straight trunk sometimes becoming wider at the base with age.  It is easily identified in the Fall because of the large whorled leaves that become a bright crimson color in the fall.  Originally introduced from he West Indies but is cultivated and has become naturalized in hammocks and coastal areas of South Florida and the Florida Keys.  It is similar to Wild Almond (Terminalia arjuna), which is also naturalized in Southern Florida but the leaves are more or less oblong or oval rather then distinctively obvate.



Image Citation: Florida Division of Plant Industry , Florida Department of Agriculture and Consumer Services, Bugwood.org

The West Indian Almond has branches borne in whorls that are often drooping.  The bark is smooth and a steely gray when young, becoming scaled with age.  The leaves are alternate, crowded near branch tips in an almost umbrella like form.  The leaves are simple, leathery in texture, narrowing to a short point with margins along the entire leaf.  The upper leaf surface is dark green in color with obvious veining, becoming crimson in the fall.  The flowers are bisexual and unisexual, borne in an elongated spike from the leaf axis, occurring in the early summer each year.  Flowers are absent of petals, having 5 sepals and are green-white in color.  The fruit is a flattened, fleshy, almond shaped drupe, green when young becoming yellow and then finally red or blackish-green when ripe.  The fruit reaches sizes of 5 cm long and matures between late Fall to early Winter.


Image Citation: Forest and Kim Starr, Starr Environmental, Bugwood.org



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Wednesday, December 6, 2017

Winged Sumac - Rhus copallinum

Winged Sumac - Rhus copallinum is a sumac that is most easily recognized by it's alternate, pinnately compound leaves with 4+ mm winged rachis.  It is a small deciduous shrub or small slender tree that reaches heights of only 30-35 feet tall.  Generally growing in an erect uproght fashion it can have single or mulitple trunks and is often thicket forming from the production of numerous root suckers.  It is native to the North America and can be found growing throughout the Eastern seaboard from Canada and Maine in the North south throughout Florida, west through eastern Nebraska and eastern Texas.  It is similar in appearance to the Prarie Sumac with the only difference being the rachis size.  

Image Citation: Vern Wilkins, Indiana University, Bugwood.org

The bark of the Winged Sumac is smooth, brown or reddish brown with numerous visable lenticles.  The leaves are alternate, pinnately compound with blades ranging in size from 10-30 cm long, having conspicuous winged rachis, the wings each reaching sizes of over 4 mm each, with 9-23 leaflets.  The flowers are unisexual, with male or female typically occuring on separate trees, green-white in color, with 5 petals and sepals each abut 1 mm long.  The fruit is a hairy rounded red drupe 4-5 mm in diameters, occuring in late Summer to early Fall and remaining until Winter.

Image Citation: Charles T. Bryson, USDA Agricultural Research Service, Bugwood.org

Tuesday, December 5, 2017

The Deciduous Holly - Ilex decidua

The Deciduous Holly (Ilex decidua) or Possumhaw Holly as it is more commonly known is a deciduous Holly tree that reaches heights of only 30 feet tall and grows in an ascending, erect or leaning fashion with a single or multiple trunks.  In open grown specimens the crowns are cylindrical in form and densely foliaged, while in forest grown specimens branches are few. The Possumhaw is native to the Eastern United States from Maryland in the north to Southern Florida in the South, West through Kansas and central Texas.  Most often located between 0-360 m in moist and wet woodlands, floodplains, bottoms, and occasionally dry uplands.  It is similar in appearance to the Carolina Holly but can be distinguished by elliptic rather than oblanceolate leaves.  





Image Citation: Rebekah D. Wallace, University of Georgia, Bugwood.org

The leaves of the Possumhaw Holly are alternate most often occurring in closely set clusters on short shoots which leads them to appear to be whorled or opposite, they are distinctly widest towards the tip with a long tapering base.  The upper leaf surfaces are dark green, margins are not visible, edges are bluntly toothed, each tooth tipped with a tiny gland. The twigs are greenish in color when young, becoming greenish brown and then gray at maturity.  The bark is grayish or gray-brown in color, smooth when young becoming slightly rougher with age.  The flowers are greenish white in color with 4-6 petals each, occurring in the Spring each year.  The fruit is a round multi-stone drupe ranging in size from 4-9mm in diameter, varying in color from red to yellow or orange, occurring in the Fall and persisting into Winter.

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Image Citation: University of Georgia, Bugwood.

Monday, December 4, 2017

The Loblolly Pine - Pinus taeda

The Loblolly Pine - Pinus taeda -  is a large evergreen tree that can reach heights of 80-100 feet in height.   It is commonly found growing in the Western United States and Canada but is native to the Southeastern United States from Central Florida on North.  It grows in a straight tall fashion with a short spread crown.  It is most commonly found from floodplains and roadsides to well drained hillsides.  Its trunk diameter can reach a very large 6+ feet and it is considered to be a very important timber tree.  The lumber is used for construction, interior finishing, craft wood, paper/pulp production, railroad ties and pilings. The name Loblolly comes from the southern term for the moist hollows or depressions that this particular tree is partial to.


Image Citation:  David Stephens, Bugwood.org

The needles are stiff and sharp tipped, pale green in in clusters of three.  The needles are generally six to nine inches long and yellow-green in color and grow in an almost tufted appearance near the edges of the branches.  The bark is cinnamon colored and appears in scaly plates.  The cones are three-six inches long, reddish brown in color and egg shaped.   The seeds are about 1 inch in size, black-brown in color and rhomboidal winged.  The flowers are monoecious and yellow in color, they appear between May-June depending on the region.  



Image Citation:  Brian Lockhart, USDA Forest Service, Bugwood.org


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