Volume 8 > Part 1 > Year 2005 > Page 104 > Euphorbiaceae > Aporosa

19. Aporosa wallichii Hook.f.wfo-0000249830

Fl. Brit. Ind. 5: 350. 1887; Gagnep. in Lecomte, Fl. Indo-Chine 5: 562. 1927; Airy Shaw, Kew Bull. 26: 218. 1972.

Accepted Name : This is currently accepted.

Description : (Small) tree, up to 15 m high; young branches very sparsely puberulous. Stipules narrowly ovate, 5–7 by 1.5–2.8 mm, caducous. Leaves: petiole terete, 6–19 mm long, pulvini distinct; blade (seldom few ovate to) elliptic, 9–17.5 by 3.5–6.5 cm, length/width ratio 2.6–2.7, papery, drying bright to yellowish-green (reddish-green) above, greenish (or brownish) beneath, base obtuse to acute, basal glands small, margin slightly undulate to crenulate, marginal glands black, apex acuminate to cuspidate, glabrous, disc-like glands regular to many, within marginal arches; venation mainly raised beneath, nerves in 8–10 pairs. Inflorescences axillary. Staminate inflorescences 2–5 together, 18–43 by 2–2.5 mm, puberulous; peduncle absent; bracts triangular, 0.7–1.5 mm long; glomerules with less than 10 laxly set flowers, continuously set along the rachis. Staminate flowers 1.2–2 mm long, sessile; sepals 3 or 4, obovate, 0.7–1.3 mm long; stamens 2 (or 3), slightly exserted, 1–2.5 mm long; anthers 0.3–0.5 mm long; pistillode present. Pistillate inflorescences 1 or 2 together, 3–9 mm long, puberulous, flowers up to 11, densely arranged along rachis; bracts triangular, 0.8–1.2 mm long. Pistillate flowers 3–4.5 mm long, sessile; sepals 3, ovate, ascending, 1–1.4 mm long; ovary 2-locular, subglabrous; stigmas raised, 2–3 mm long, apically bifid to less than halfway. Fruits (narrowly) ovoid, young ones stiped, often beaked, 9–11 by 6–9 mm, drying (dark) brown to black, glabrous, not fleshy; septae and column sparsely hairy, glabrescent. Seeds 7–7.5 by 5–6 by 2–3 mm.

Thailand : NORTHERN: Chiang Mai, Chiang Rai, Lampang, Nan, Tak, Sukhothai, Phitsanulok; NORTH-EASTERN: Loei; EASTERN: Chaiyaphum; SOUTH-WESTERN: Kanchanaburi, Phetchaburi; CENTRAL: Saraburi; SOUTH-EASTERN: Chon Buri; PENINSULAR: Ranong.

Distribution : North India (type), Burma.

Ecology : (Dry) evergreen or (mixed) deciduous forests, Quercus-dipterocarp forests, dry or open, on slopes, or along edge of forests, on granite bedrock, 100–1,300 m alt.

Vernacular : Mueat won (เหมือดวอน)(Northern, Southwestern).

Notes: Intermediates with Aporosa octandra exist, e.g., specimens with green, but hairy leaves, or specimens with brown, glabrous leaves. Specimens with hairy, green leaves and hairy ovaries are A. octandra, while those with glabrous, brown leaves and glabrous ovaries are A. wallichii.