Acrocarpus fraxinifolius

Author: Arnott

Morphological description (see also description of Genus Acrocarpus )
(fraxinif Acro lf/inf/fl FT10 )
Tree 20–30(–50) m high and 0.6–1(–4) m in diameter. Stipules small, caducous.

Leaves impari- or paribipinnate; rather large, petiole and main rachis up to 80 cm; pinnae (2–)3–5 pairs, secondary petiole and rachis up to c. 45 cm long; petiolules 2–4 mm. Leaflets 4–7(–9) pairs per pinna, chartaceous, ovate or ovate-oblong, 3.5–11(–18) by 1.5–5(–8.5) cm, shortly acuminate or acute; base cuneate, obtuse, or rotund, rarely obscurely cordate, sometimes slightly asymmetric; pubescent beneath when young, glabrescent, often slightly hairy along the midrib and on the petiolules, sometimes almost glabrous when old; lateral nerves 5–9(–12) pairs (fraxinif Acro lf/inf/fl FT10).

Inflorescences axillary, solitary, sometimes few-branched, branches with spike-like racemes, erect, bottle-brush-like, up to 32 cm long; bracts and bracteoles small, caducous; pedicels 4–10 mm.

Flowers pentamerous, bisexual. Hypanthium cupular, 2.5–8 mm long. Calyx puberulous outside; lobes imbricate, ovate or triangular, 2.5–4 mm long. Petals imbricate, dark red, oblong or slightly oblanceolate, 5–9 by 1–2.5 mm, puberulous on both surfaces. Disk cupular, completely united with the hypanthium, hairy on the lower half inside. Stamens 5, ¾laments 15–18 mm; anthers versatile, introrse, 2–3 mm long. Ovary with a free stipe, oblong or linear, 12–15 mm long, loosely hairy except the apical part, 10–20-ovuled; style and stigma not sharply distinct from the ovary, incurved, pointed at the apex.

Pods erect, elongate, flattened, long-stipitate, 2-valved; valves straight, thin-coriaceous, narrowly winged along the adaxial suture, wing 3–5 mm wide, rather smooth; (8–)10–12(–17) by (1–)1.5–2 cm (incl. stipe).

Seeds (3–)10–18, slightly lens-shaped, smooth, not albuminous, c. 6.5 by 5 mm.

See also Genus Acrocarpus .

Eastern India, Burma, Thailand, Laos, China. In Malesia : Sumatra and Central Java.

Habitat & Ecology
In constantly wet and fertile soil in the forest, sometimes found in abandoned ¾elds, altitude 600–1200 m. Flowering in February, March, May, and December; fruiting in March, April, and September–November.