Volume 8 > Part 1 > Year 2005 > Page 94 > Euphorbiaceae > Aporosa

11. Aporosa nigricans Hook.f.wfo-0000249300

Fl. Brit. Ind. 5: 347. 1887; Airy Shaw, Kew Bull. 26: 217. 1972; Whitmore, Tree Fl. Malaya 2: 61. 1973; Airy Shaw, Kew Bull. Add. Ser. 4: 39. 1975.

Accepted Name : This is currently accepted.

Description : Shrub to tree, up to 18 m high; young branches sparsely puberulous. Stipules not seen, caducous. Leaves: petiole reniform, 9–32 mm long, sparsely puberulous, pulvini distinct; blade elliptic, 12.5–27.5 by 4.5–14.5 cm, length/width ratio 1.9–2.8, papery, drying brownish or greenish above, darker beneath, blackening, base rounded to acute, basal glands small, indistinct, margin somewhat undulate to crenate or serrate, marginal glands distinct, apex acuminate to cuspidate, glabrous above, sparsely hirsute beneath, disc-like glands absent; venation ± flat above, raised beneath, nerves in 8–11 pairs. Inflorescences axillary. Staminate inflorescences 1–6 together, 8–28 by 1.8–2.5 mm, tomentose; peduncle 0–2 mm long; bracts triangular, 0.6–1 mm long; glomerules with 13–20 densely set flowers, spaced at ca 0.1 mm along rachis. Staminate flowers 0.4–0.6 mm long; pedicel 0.2–0.3 mm long; sepals (3)4(5), obovate, 0.5–0.8 mm long; stamens 2, not to slightly exserted, 0.3–0.6 mm long; anthers 0.1–0.2 mm long; pistillode minute. Pistillate inflorescences 1–3 together, 2–9 mm long, tomentose; flowers up to 9, densely arranged along the rachis; bracts triangular, 0.8–1.6 mm long. Pistillate flowers 3–4.5 mm long; pedicel 0.3–1 mm long; sepals (3) 4, ovate, patent, 1.2–2 mm long; staminode occasionally 1; ovary 2-locular, densely tomentose; stigmas sessile to slightly raised, 0.5–1.5 mm long, (almost) completely divided. Fruits ovoid, not stiped, not beaked, 10–12 by 9–12 mm, drying blackish to brownish with yellowish-whitish sutures, sparsely hairy, not fleshy; septae and column (sparsely) sericeous, mostly along margins. Seeds 6–8.5 by 6–8 by 3–4 mm.

Thailand : PENINSULAR: Trang (Khoo Chong), Songkhla (Khao Nam Kang), Pattani (Ban Bacho), Narathiwat (Bala-Hala).

Distribution : Nicobar Islands, Malay Peninsula (type), Sumatra, Borneo.

Ecology : Primary, secondary. logged over, cleared, or open forests, margins of swamp forests, in flat to low undulating land; on roadsides, hillsides, hill ridges, steep or gentle slopes; on sandy or sandstone with clay, brownish to blackish soil; 5–600 m alt.

Vernacular : Krom khao (กรมเขา)(Nakhon Si Thammarat).