Chisocheton siamensis Craib - MELIACEAE

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Botanical descriptions Habitat and ecology Distribution

Botanical descriptions :

Diagnostic characters : Evergreen trees, bark fissured to flaky. Leaves paripinnate, alternate, rachis swollen at base, tip continuously growing leaflets 5-10 pairs. Inflorescence axillary, long and pendulous, flowers creamy-white, Fruit a capsule, covered by an aril.
Habit : Evergreen tree up to 5 m. tall, about 10 cm. in diameter.
Trunk & bark : Trunk smooth, greyish, finnely fissured, flaky and lenticellate, outer bark 1 mm. thick red, inner bark c 0.5 cm. thick, soft, light brown, sapwood creamy white.
Branches and branchlets or twigs : Branches terete, hairy when young but glabrous when mature.
Exudates : Exudate absent.
Leaves : Paripinnately compound leaves, alternate, rachis up to 50 cm. long, swollen at base, tip continuously growing; opposite leaflets 5-10 pairs, oblong-elliptic 3-6 x 6-18 cm. in length, asymmetric blade, apex acute to acuminate, base rounded, margin entire; lamina glabrous on both surface but partly hairy when young.
The veins prominent below, secondary veins (about 7-10 pairs) oblique widely parallel, tertiary veins obliques. Petiolule swollen, very short or sessile, up to 3 mm. long. Leaves with fern like tip; exstipulate.
Inflorescences or flowers : Inflorescence shorter than leaf, less than 30 cm. axillary panicle. Flowers bisexual, cylindrical tubes, white. Pedicel shorter than 0.5 cm long.
Fruits : Fruit is a thick capsule, rounded about 5 cm. in diameter, thick walled, glabrous. Greenish-brown when young then red, later dehiscent into segments, 2-4 loci. Almost 3 lobes.
Seeds : A few, globose, black partly covered by aril.

Habitat and ecology :

In evergreen or open degraded forests from 400 to 600 m. altitude, along the river.

Distribution :

India, Chine, Burma (Myanmar), Vietnam and Laos.

Remark/notes/uses :
No known uses.

Specimens studied :
BT 794, BT 841, Lao 31 (Herbarium of Faculty of Sciences-NUoL, NHN-Leiden and CIRAD-Montpellier).

Literature :
Dung, Vu Van. 1996. Vietnam Forest Trees. Agriculture Publishing House, Hanoi, Vietnam.

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