Tuesday, March 12, 2024

Japanese Pagoda Tree - Styphnolobium japonicum

  Japanese Pagoda Tree - Styphnolobium japonicum, is recognized by the combination of  pinnate leaves, white or yellow to white flowers and yellow to brown, necklace like legume.  It is a deciduous tree that reaches heights of about 60-65 feet tall. Growing in an erect form with a single trunk and broad crown.  It was introduced from Asia and is cultivated and now naturalized from Pennsylvania and Ohio in the North to North Carolina in the South. 



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

The Styphnolobium or Necklacepods is a small genus, made up of only 7 species of shrubs and trees.  The leaves are always alternate and pinnately compound and the flowers bisexual.  The fruit is a very distinct beadlike legume and the seeds are toxic.  The species in this genus have been commonly grouped with the Sophora, unlike the Sophora species, they lack the ability the fix atmospheric nitrogen.  

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


The bark of the Japanese Pagoda Tree is gray-brown and ridged with elongated vertical furrows.  The leaves are alternate and pinnate, the blades are 15-25 cm long and about 11 cm broad.  The leaflets are 7-17 in number alternate and opposite.  The flowers are bisexual and either Corrolla White or Yellow White in color and about 1 cm long each.  The fruit is hairless and yellow-green to light brown in color and in the form of 8-20 cm long legumes with seed compartments that mature in Autumn and persist into Winter.  

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