e-Flora of Thailand
Volume 8 > Part 1 > Year 2005 > Page 84 > Euphorbiaceae > Aporosa
1. Aporosa arborea (Blume) Müll.Arg.wfo-0000248265
in DC., Prodr. 15(2): 470. 1866; Airy Shaw, Kew Bull. 26: 214. 1972; Whitmore, Tree Fl. Malaya 2: 61. 1973.— Leiocarpus arboreus Blume, Bijdr.: 582. 1825. Fig. 16: A–B.
Accepted Name : This is currently accepted.
Synonyms & Citations :
Description : Shrub to tree, up to 25 m high; young branches sparsely puberulous. Stipules caducous. Leaves: petiole reniform, 14–55 mm long, pulvini distinct; blade elliptic to obovate, 13.5–35 by 4.5–15 cm, length/width ratio 2.3–3, papery, drying bluish or greenish, blackening above, greyish brown beneath, base rounded to acute, basal glands absent, margin slightly undulate, marginal glands small, apex acuminate to cuspidate, midrib at base sparsely puberulous above, midrib and nerves sparsely puberulous beneath, disc-like glands often few present along the margin; venation slightly sunken above, raised beneath, nerves in 12–16 pairs. Inflorescences below the leaves to ramiflorous. Staminate inflorescences 1–6 together, 16–55 by 0.5–1 mm, (sparsely) tomentose; peduncle 0.5–4 mm long; bracts triangular, 0.3–0.5 mm long; glomerules with up to 20 densely set flowers, spaced at 0-4 mm at base of rachis to touching at apex. Staminate flowers 0.4–0.8 mm long, yellow; pedicel minute; sepals 4 or 5, obovate, 0.5–0.8 mm long; stamens 2, slightly exserted, 0.3–0.4 mm long; anthers ca 0.2 mm long; pistillode minute. Pistillate inflorescences 1–6 together, 12–36 mm long, (sparsely) tomentose; flowers up to 11, laxly set along rachis; bracts triangular, 0.3–0.5 mm long. Pistillate flowers 2–5 mm long; pedicel 1.5–3 mm long; sepals 5, ovate, patent to slightly reflexed, 0.6–1 mm long; ovary globose, 3(4)-locular, sparsely puberulous; stigmas slightly raised, 0.7–1.5 mm long, bifid to ca halfway. Fruits ellipsoid to globose, not stiped, young ones slightly beaked, 13–17 by 10–13 mm, yellow, drying (dark) brown, glabrous, slightly fleshy; septae and column glabrous. Seeds 9–11 by 5.5–7.5 by 2–4 mm; aril red.
Thailand : PENINSULAR: Pattani (To Mo), Yala (Khao Pi Sat), Narathiwat (Khao Sam Sip, Waeng).
Distribution : Malay Peninsula, Sumatra, West Java (type), Borneo.
Ecology : Primary or secondary evergreen forests, lowland, undulating country; on hillsides, ridge tops, and river sides; on granitic sandy, and brownish soil; 20–1,000 m alt.
Vernacular : Plueak khao (เปลือกข้าว)(Peninsular).
Uses: Wood is used for furniture.