Volume 8 > Part 2 > Year 2007 > Page 384 > Euphorbiaceae > Macaranga

22. Macaranga triloba (Reinw.ex Blume) Müll.Arg.

in DC., Prodr. 15, 2: 989. 1866; Hook.f., Fl. Brit. Ind. 5: 452. 1887; Pax & K.Hoffm. in Engl., Pflanzenr. IV. 147. vii: 380. 1914; Gagnep., in Lecomte, Fl. Indo-Chine 5: 439. 1926; Airy Shaw, Kew Bull. 26: 292. 1972; S.J.Davies, Harvard Papers Bot. 6: 418. 2001.— Ricinus trilobus Reinw. ex Blume, Catalogus 108: 1823, nom. nud.— Pachystemon trilobus Reinw. ex Blume, Bijdr.: 626. 1825.

Accepted Name : This is currently accepted.

Description : Tree, up to 20 m high, dbh to 25 cm, often smaller; twigs 6–12 mm in diam., finely tomentose to glabrous, solid, without ants. Stipules ovate-elliptic, 7–12 by 5–10 mm, spreading to recurved, not appressed to stem. Leaves; petiole to 25 cm long, rounded, tomentose to glabrous; blade ovate to broadly ovate, to 35 by 28 cm, trilobed to ⅓–½, sometimes with extra basal lobes, central lobe narrowly deltate, laterals narrow, spreading, base rounded to subtruncate, peltate to 7 cm, margin with prominent glandular teeth, apex acute to acuminate, surfaces at first reddish-brown with erect hairs, becoming glabrous above, shortly pubescent below. Staminate inflorescences paniculate, erect, 10–22 by 8–16 cm, light green, with scattered whitish and ferruginous hairs to ± glabrous, to 3–4 axis orders, rachis flattened, lowest branches opposite; bracteoles ovate to ovate-elliptic, 2–5 by 2–4.5 mm, margin mostly entire, apex acuminate to caudate, ferruginous hairy. Staminate flowers 20–35 per cluster, ca 0.8 mm long, sessile; sepals 3, fused, ferruginous hairy; stamens 1, anthers 3-locular. Pistillate inflorescences 4–10 by 2–5 cm, unbranched or one pair of branches, otherwise as staminate. Pistillate flowers 3–4 mm long; calyx urceolate, ferruginous pubescent, persistent; ovary 4- or 5-locular; stigmas 2–3 mm long, fused at base. Fruits subglobose, 6–8 by 10–13 mm, sessile, one discrete glandular patch on each carpel wall developing into a 3–5 mm long horn, yellow, sticky; crowned by 4–6 mm long fused stigmas. Seeds 4–4.5 mm in diam., black, grooved; aril red.

Thailand : PENINSULAR: Pattani, Narathiwat.

Distribution : Sumatra (including Bangka), Java (type), Malay Peninsula, Cambodia?, S Vietnam?

Ecology : Lowlands, up to ca 800 m alt.

Vernacular : Lo khao (ลอขาว)(Nakhon Si Thammarat); sala pang (สลาป้าง)(Trat); lo ngam (หล่องาม)(Trang).