Alangium havilandii Bloemb.

Dewilde, W. J. J. O. & Duyfjes, B. E. E., 2017, Taxonomy of Alangium section Conostigma (Alangiaceae), Blumea 62 (1), pp. 29-46 : 33

5. Alangium havilandii Bloemb. — Fig. 2

Alangium havilandii Bloemb. (1935) 277, f. 4g, h; (1939) 213, f. 8, 9g, h; Berhaman (1995) 8;Argent (in Argent et al.1997) 4. — Type: Omar 54 (holo SING), Borneo, Sarawak, Gunung Sedilu Forest Reserve, 9 Apr. 1924, fl.

Tree 5–25 m tall; twigs dark grey or brownish black, 1.5–3 mm diam, densely minutely grey or brown hairy (hairs less than 0.1 mm long), late glabrescent; leaf bud minutely hairy. Leaves: petiole (0.5–) 1 cm long; lamina drying (blackish) brown, often with a leaden-grey tinge, glabrous (veins glabrescent below), (ovate-)elliptic or oblong, 5–15 by 3–7 cm, base asymmetric, rounded or short cuneate, apex acute-acuminate; veins pinnate, 6–8 on each side; tertiary venation thin, reticulate-scalariform. Inflorescences minutely hairy, of 1 or 2 (or 3) main branches (peduncles) from the leaf axil, each few-branched, 2–6(–8)-flowered; peduncle (s) 5–18 mm long. Flowers minutely hairy; pedicel 1–3 mm long; corolla in bud 12–16 mm long, base strongly swollen, apex acute; ovary and calyx c. 4 mm long, coarsely ribbed; limb c. 1.5 mm long, at margin c. 4 mm wide, lobes (4 or) 5, conspicuous, acute; petals (4 or) 5, inside glabrous (except at very base), 15(–18) mm long; stamens (4 or) 5, filament c. 5 mm long, densely hairy in the thickened lower half, upper half slender, glabrous, anther 8–10 mm long, connective glabrous; style densely hairy, 10–15 mm long, stigma conical. Fruit 1–3 per infructescence, ripening pink, minutely hairy, ovoid-ellipsoid, c. 15 by 10 mm, smooth; calyx remnant small.

Distribution — Borneo ( Brunei, Sarawak).

Habitat & Ecology — Lowland peat swamp forest; flowering and fruiting all year round.

Field-notes — Low buttresses or stilt-roots recorded; fruit green, ripening (pale) pink.

Vernacular names ― Dadam, Jadam (Milanau).

Note — With the original description of A. havilandii ( Bloembergen 1935) only 3 flowering collections were known. At present there are over 20 collections.

Figures

Fig. 2 Alangium havilandii Bloemb. a. Flowering twig; b. partial inflorescence; c. flower; d. apex of style with stigma; e. fruit (a–d: Ariffin et al. BRUN 17820; e: Anderson 8531, all L). — Drawn by Jan van Os.