Volume 8 > Part 2 > Year 2007 > Page 365 > Euphorbiaceae > Macaranga

4. Macaranga diepenhorstii (Miq.) Müll.Arg.wfo-0000231925

in DC., Prodr. 15, 2: 998. 1866; Pax & K.Hoffm. in Engl., Pflanzenr. IV. 147. vii: 337. 1914; Whitmore, Tree Fl. Malaya 2: 111, 1. 8. 1973; Kew Bull. 36: 321. 1981.— Mappa diepenhorstii Miq., Fl. Ind. Bat. Suppl. 457. 1861.

Accepted Name : This is currently accepted.

Description : Small bushy crowned trees in secondary forest, or tree, up to 24 m high, 70 cm diam. in primary forest; twigs near tip drying angled, ca 4 mm in diam.; behind rounded, 10(–15) mm in diam., smooth, glabrous, dark brown with pale stipule scars. Stipules ovate-oblong, 10(–15) by 5(–8) mm, warm brown, papery, glabrous, erect, apex acute, subpersistent. Leaves: petioles 16–26 cm long, 2–4 mm in diam., rounded, striate, glabrous, weakly kneed at both ends; blade ovate, 13–30 by 10–23 cm, papery, base broadly rounded, 2–6 cm peltate, with palmate venation, margin crenate and distantly glandular dentate, apex acute, below closely finely granular glandular and glabrous except for sparse hairs on main nerves, secondary nerves curved, concolorous with lamina, tertiaries closely scalariform and clearly visible especially below. Staminate inflorescences diffuse, sinuous, narrow panicles to 18 cm long, lower branches 2–5 cm long, sinuous, bracts similar to stipules, flower clusters of 4–8 flowers on 1 cm long catkin like tertiary branches, some with a 12 mm long basal stalk, bracteoles glabrous, erect, overlapping, lower bracteoles squarish, ca 4 by 6 mm, upper edge coarsely toothed, papery, nerved, upper bracteoles similar but smaller and entire. Staminate flowers: pedicel ca 0.5 mm long; sepals 2, glabrous; stamens 2, 4-locular. Pistillate inflorescences as staminate ones but smaller, to 15 cm long and racemose, branches 2–3 cm long, bracteoles similar, flowers solitary. Infructescences with 1 cm distant solitary fruits. Fruits 2-lobed, ca 5 by 10 mm, splitting, thinly woody, drying black granular glandular, without spines, styles 2, ca 1 mm long, apically slightly flattened and recurved; pedicel ca 10 mm long, slender, glabrous; sepals persistent, tiny, ca 0.5 mm long.

Thailand : PENINSULAR: Krabi, Nakhon Si Thammarat, Trang, Pattani, Narathiwat

Distribution : Malay Peninsula, Sumatra (including Pulau (= Island) Simalur – type).

Ecology : Secondary forests, also often along rivers in primary forests, to 600 m alt.