Alangium ebenaceum (C.B.Clarke) Harms

Dewilde, W. J. J. O. & Duyfjes, B. E. E., 2017, Taxonomy of Alangium section Conostigma (Alangiaceae), Blumea 62 (1), pp. 29-46 : 32

4. Alangium ebenaceum (C.B.Clarke) Harms

Alangium ebenaceum (C.B.Clarke) Harms (1898) 262; King (1902) 78. — Marlea ebenacea C.B. Clarke (1879) 742;Ridl.(1922) 893. — Alangium javanicum (Blume) Wangerin var. ebenaceum (C.B.Clarke) Berhaman (1994) 33. — Lectotype (designated by Berhaman 1994): Griffith 3383 (K K000704840; iso P P00542742, U U.1230474), Peninsular Malaysia, fl.

Alangium sessiliflorum Merr. (1929) 232. — Type: Wood 2252 (holo UC n.v.; iso K K000704823 ), Borneo, Sabah, Batu Lapan , fl.

Tree 2.5–20 m tall; twigs (blackish) brown, (3‒) 4–10 mm diam, at apex (incl. leaf bud) early glabrescent from minute greyish hairs less than 0.1 mm long. Leaves: petiole 1‒2(‒2.5) cm long; lamina drying (green-)brown above, usually purplish below, glabrous, coriaceous, elliptic-oblong, 15–50 by 3–18 cm, base almost symmetric, rounded or short (long) cuneate, apex acute-acuminate; veins pinnate, (8–)10–15 on each side, (sub)loop-veined; tertiary venation thin, reticulate-scalariform. Inflorescences glabrous (early glabrescent from minute hairs less than 0.1 mm long), simple or of 2 main branches (peduncles) from the leaf-axil, each (5–)10–20-flowered, peduncle (s) 10(–15) mm long. Flowers (minutely) densely hairy; pedicel to 5 mm long; corolla in bud minutely greyish hairy, (10–) 12–16 mm long, base not swollen, apex frequently narrowed, acute; ovary and calyx 2–5 mm long, faintly ribbed or not ribbed; limb broadly cup-shaped or saucer-shaped, spreading, 1.5–3 mm long, at margin 3.5–5 mm wide, entire or faintly lobed; petals 5 (or 6), inside minutely hairy, except narrowed apex, 12–15 mm long; stamens 5 (or 6), filament 3‒5 mm long, broadened, inside near apex swollen and hairy (hairs c. 0.4 mm long), anther 9–11 mm long, connective glabrous; style appressed hairy, 6– 9 mm long, stigma narrowly conical. Fruit 1 or 2 per infructescence, ripening pinkish red or purplish black, glabrous, broadly ovoid-ellipsoid, 20–30 mm long, smooth or lowly 10-ribbed; calyx remnant 2–4 mm long, narrow or broad, up to 9 mm wide.

Distribution — Sumatra (Palembang, Bangka), Peninsular Malaysia, Borneo ( Sarawak, Sabah, W & E Kalimantan).

Key to the varieties

1. Twigs 3–5 mm diam. Lamina (sub)coriaceous, 15–26(–28) by (3–) 5–9 cm. ― Sumatra, Peninsular Malaysia, Borneo............................... a. var. ebenaceum