Author: Merrill
Morphological description
Tree to 15 m high and c. 38 cm in diameter. Stipules intrapetiolar, c. 3.5 mm long, caducous.
Leaves 1- or 2-foliolate, when 2 never opposite, very shortly petioled; petiole and rachis up to c. 10 mm long, prolonged beyond the upper petiolule into a subulate tip c. 2 mm long; petiolules short, 2-3.5 mm, glabrous. Leaflets firmly chartaceous, elliptic, elliptic- or obovate-oblong, or lanceolate, 9.5-21(-29) by 3.5-7(-9) cm, apex (shortly) acuminate; base acute or obtuse, symmetric; glabrous or rarely sparsely minutely hairy below; nerves 6-9 per side.
Inflorescences racemose, axillary or sometimes terminal, up to c. 11(-16) cm long, glabrous, rather loosely flowered; bracts of the peduncle triangular, or 3-lobed with the central lobe relobed and bristle-like, up to c. 5 mm long, glabrous except ciliate at the margins; bracteoles often at the lower half or at the base of the pedicel, minute, triangular, c. 0.75-1 mm long; pedicels 2-4 mm, articulate at the base, glabrous.
Flowers glabrous outside except ciliate at the margin of the calyx lobes, white or yellowish white. Hypanthium c. 1 mm long, sometimes slightly longitudinally ridged outside, sparsely hairy inside. Calyx lobes ovate or broadly elliptic, c. 4 by 2.5-3 mm, glabrous inside. Stamens 10; filaments 4-6 mm (or longer); anthers c. 0.75 mm long. Pistil stipitate; stipe free, 0.75-1 mm long, puberulous; ovary c. 3.5 mm long, 3- or 4-ovuled; style up to c. 10 mm, often slightly hairy at lower half; stigma slightly thicker than the style.
Pods (very young) elliptic, 5.5 by 3 mm.
Distribution
Malesia: Borneo (Sabah, Sarawak), and Philippines (Luzon).
Habitat & Ecology
Primary and dipterocarp forests, hill ridge, low undulating area, or near the river, altitude up to 300(-900) m. Flowering January-April, June, October; fruiting April.
Note
Crudia subsimplicifolia is closely allied to Crudia reticulata . It can be easily recognized by the leaves 1- or 2- foliolate, usually glabrous on both surfaces, nerves flat above, and inflorescences with glabrous peduncles, rachides, pedicels and flowers (except shortly ciliate at the calyx margins).