Alstonia rostrata

Primary tabs

Alstonia rostrata

Description

Tree 8-35 m high, 15-80 cm dbh, sometimes slightly fluted at the base, without buttresses. Bark shallowly and/or irregularly fissured, pale or yellowish brown; Branchlets glabrous. Leaves in whorls of 3-4(-6); Inflorescence 2-5 cm long, many-flowered; Flowers fragrant. Sepals dark green or pink, sometimes red, connate at the base for 0.2-0.4 mm, ovate or suborbicular, 0.9-1.2(-1.7) by 0.9-1.2(-1.5) mm, erect, rounded, glabrous outside, glabrous or laxly puberulous around the apex inside, ciliate. Stamens inserted at 3-3.3 mm from the base; Fruit solitary, composed of a united pair of follicles, 16-30 cm by 8-12 mm, slightly laterally compressed and with distinct and narrow grooves on both sides on the flattened parts, glabrous, roughly striate and thick-walled. Seeds elliptic or oblong, 9-11 by 2.8-3 mm, glabrous and a tuberculous on both sides (except surrounding the hilum, which is smooth), ends rounded;

Distribution

Asia-Temperate: China South-Central (Yunnan present); Hainan (Hainan present), Asia-Tropical: Malaya (Peninsular Malaysia present); Sumatera (Sumatera present); Thailand (Thailand present), Burma present, North Province present, West Province present
China (Yunnan, Hainan), Burma, Thailand; in Malesia: Sumatra (known only from North Province and West Province), Peninsular Malaysia.

Citation

D.J. Middleton 1999 – In: Fl. Thailand: 44
D.J. Middleton & M. Gilbert 1994 – In: Taxon: 478
Whitmore & Tantra 1986: Checklist Sumatra: 18
Sidiy. 1998 – In: Blumea: 168