Rothmannia vietnamensis Tirveng. - RUBIACEAE

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Botanical descriptions Habitat and ecology Distribution

Botanical descriptions :

Habit : Deciduous shrub up to 2 m. tall, 0.4 cm in DBH.
Trunk & bark : Trunk smooth, greenish-brown, lenticellate, outer bark green, inner bark orange, sapwood yellow.
Branches and branchlets or twigs : Branches glabrous, often with pair of nodes closed together, the distal one developing only one leaf so that the leaves occur in group of three.
Exudates : Exudate absent.
Leaves : Simple leaves, opposite, sometime in group of three, elliptic to oblong 4-7 x 12-20 cm. in length, apex acute, base acute to attenuate, margin entire, blade subcoriaceous, glabrous on both side.
Midrib flat above, prominent below.
Primary vein single, secondary veins obtuse, closely parallel, 7-10 pairs.
Stipule interpetiolar, small, triangular.
Inflorescences or flowers : Solitary large flower, terminal but sometime seemingly axillary, few to 1 flower, funnel shape, tube up to 6 cm. long, and lobe up to 4 cm. long, whitish cream and red dots inside corolla, with entensive sweet smell.
Fruits : Fruit berry-like, solitary, globose to ovoid, learhery, indehiscent, about 3-4 cm. in diameter. Young fruit green.
Seeds : Seeds numerous. .

Habitat and ecology :

In mountainous evergreen forest, Pine or Fagaceous forest, and degraded forests from 500 to 600 m. altitude.

Distribution :

Thailand, Vietnam and Laos.

Remark/notes/uses :
No known uses.

Specimens studied :
BT 150 and BT 154 (Herbarium of Faculty of Sciences-NUoL, NHN-Leiden and CIRAD-Montpellier).

Literature :
Puff C., K. Chayamarit and V. Chamchumroon. 2005. Rubiaceae of Thailand. A pictorial guide to indigenous and cultivated genera. The Forest Herbarium, National Park, Wildlife and Plant Conservation Department, Bangkok.

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