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Alstonia rupestris Kerr
岩生羊角棉
Description from Flora of China
Blaberopus rupestre (Kerr) Pichon
Shrubs erect, to 4 m tall, glabrous. Bark gray-brown; branches lenticellate. Leaves in whorls of 3-5, sessile; blade very narrowly elliptic or sublinear, 4.5-10 X 0.5-1.5 cm, thick papery, glabrous, apex acuminate; lateral veins 45-80 pairs, nearly at a right angle to midvein. Cymes crowded. Pedicel ca. 3 mm. Corolla white, tube 7-8 mm; lobes oblong, 2.5-3 mm, overlapping to left. Disc lobes as long as ovary. Ovaries distinct. Follicles red-brown, linear, 7-10 cm. Seeds with brown cilia. Fl. May-Oct.
Limestone rocks in brushwoods or forests; 500-1800 m. W Guangxi [Thailand].
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