Ormosia cambodiana Gagnep. - PAPILIONACEAE

Synonym : Placolobium cambodianum (Gagnep.) Yakovlev

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Botanical descriptions Habitat and ecology Distribution

Botanical descriptions :

Diagnostic characters : Large deciduous or evergreen trees, bark lenticellate, exudates red-brown. Leaves imparipinnate, alternate, rachis swollen at the base, leaflets opposite. Flowers bisexual, pea-like, violet-purple. Fruit a thick pod.
Habit : Deciduous or evergreen tree up to 25 m. tall, about 45 cm. in DBH; bark light brown, outer bark c. 3 cm. thick, dark brown, inner bark red, sap wood straw.
Trunk & bark : Trunk lenticellate, bark dark brownish-red, inner bark yellow, with red-brown sap. .
Branches and branchlets or twigs : Branches terete, glabrous, brownish when dry, lenticellate, and at the first nearly flat.
Exudates : Reddish-brown sap.
Leaves : Imparipinnately compound leave, alternate, crowded at the apex of branchelets, rachis up to 7 cm. long, swollen at the base. Leaflets 5-9, opposite, ovate to elliptic, apex acute to acuminate, base acute, margin entire, young leaves redish-brown, blade coriaceous and glabrous on both surface.
Midrib grooved above, prominent below.
Primary vein single, secondary veins obtuse, about 8 pairs, tertiary veins reticulate. Rachis small about 5-7 cm. long.
Inflorescences or flowers : Inflorescence are racemes, axillary and terminal, glabrous, up to 20 cm. long. Flowers violet-purple grouped at the top of inflorescence, glabrous, pedicel about 7 mm. long, calyx dark brown.
Fruits : Fruit is a thick pod, 2-3 X 5-7cm in length, thick walled, glabrous, red on the outer surface then brown, later dehiscent.
Seeds : Only one red seed.

Habitat and ecology :

In depleted forest, evergreen or open degraded forests from 200 to 600 m. altitude.

Distribution :

Burma (Myanmar), Cambodia, Thailand, Vietnam, and Laos.

Remark/notes/uses :
The wood is used for household applications and in construction work.The tree has ornamental value.

Specimens studied :
BT 434 (Herbarium of Faculty of Sciences-NUoL, NHN-Leiden and CIRAD-Montpellier).

Literature :
Dung, Vu Van. 1996. Vietnam Forest Trees. Agriculture Publishing House, Hanoi, Vietnam.
Flore du Cambodge, du Laos et du Viêtnam 1960-2003. Vol. 23. Muséum national d'histoire naturelle, Paris, France.

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