Author: de Wit
Morphological description
Tree 20-30(-41) m high. Stipules connate in the lower half or almost entirely when very young, up to 10 mm long, puberulous on both surfaces, caducous (bruggem Sindora stipul 428851 ).
Leaves (5 or)6-8-jugate (bruggemanii Sind lf/pod 139550 ); petiole 1.5-3.5 cm and rachis 11-22 cm long, pubescent, glabrescent; petiolules very short, up to c. 5 mm, sparsely pubescent. Leaflets (bruggem Sindora marg.gl 428850) coriaceous, elliptic, elliptic-oblong, lanceolate, rarely elliptic-obovate, 3.9-8.7(-16) by 1.5-2.6(-5) cm, lower ones usually smaller than the upper ones; apex acuminate; base obtuse, rounded, often symmetric; upper surface glossy and almost glabrous; lower surfaces glossy, glabrous except pubescent on the midrib.
Inflorescences (bruggem Sindora lf/infl 255222 ) paniculate, up to 20(-26) cm long, lateral branches up to c. 4.5 cm long, both rachis and branches densely puberulous; bracts triangular, 3-4 mm long, densely puberulous; bracteoles minute, lanceolate, less than 1 mm long, puberulous on both surfaces; pedicels 3-5 mm, densely puberulous.
Flowers: Calyx lobes 4, broadly lanceolate or ovate, 3.5-6 by c. 3 mm, unarmed, densely puberulous outside, densely appressed hairy inside. Petal 1, oblobng-elliptic, 7-8.5 by 2-2.5 mm, fleshy; outside densely puberulous in the lateral parts of lower half; inside glabrous; margin villose. Stamens: 10 (9+1), filaments with basal parts connate c. 1 mm high, free filaments and staminodes up to c. 12 mm, sparsely hairy on the lower parts; anthers 2 (perfect) largest, ellipsoid, c. 3 mm long, the others smaller, c. 2 mm long. Ovary subsessile or very shortly stipitate, subrhomboid, c. 3 mm long, densely woolly along the suture, glabrous in the centre, with some minute protuberances observed under dissecting microscope, 5-7-ovuled; style up to c. 12 mm, recurvate, glabrous or thinly puberulous in the basal part; stigma obscure.
Pods (bruggemanii Sind lf/pod 139550; bruggem Sindora lf/pods 255221) on a stout peduncle up to 1.7 cm long, ellipsoid, oblong- or broad-ellipsoid, or broadly ovoid, 7.5-15 by 5.5-7 cm, flattened, hard, covered with some scattered, slender, sharp spines (up to c. 3 mm), beak recurvate, c. 10 mm long, 1-3-seeded.
Seeds suborbicular or broadly ovoid, 1.5-2.3 by 1.5-2 cm, smooth, on top of a larger aril; aril very variable in shape and size, smooth or slightly irregular on the surface, slightly reniform, 2.5-2.8 by 1.5-1.8 cm.
Seedling: bruggem Sindora seedl 428852
Distribution
Malesia: Sumatra (Atjeh, E & W Coast, Palembang), Borneo (Kalimantan).
Habitat
In lowland forests, up to 100 m altitude, along riverbanks or brooks, on clayey or sometimes sandy clayey soils, rare or very rare, only very locally more common, scattered or a few trees together. Flowering in September, October; fruiting in May, June.
Uses
Useful timber as other species.
Note
De Wit (1949: 21) cited "Teijsman 3697, culta Hort. Bot. sub I.L.22, coll. 29.V.1941" as the type of the present species. Dr. Elizabeth Widjaja (in litt. ) kindly checked the relevant collections in BO. There is no herbarium specimen present of Teijsmann 3697, which may be a living collection brought back from Sumatra and planted in the Botanic Garden under nr. I-L-22. The collection made by de Wit as mentioned above, is the type of this species, not the other specimens collected from the same plant.