Bauhinia sylvani

Author: (de Wit) Cusset

Morphological description (see also description of Genus Bauhinia ; Subgenus Phanera and Section Phanera)
(sylvani Bauh Reinw f11 )
Giant liana with up to 60 m tall stems. Young branches brown woolly, strongly angulate and longitudinally grooved; tendrils densely brownish hairy.

Leaves: stipules foliaceous, auriculate-orbicular, densely hairy outside, thinly pubescent inside, up to 2.5 cm diameter; petiole stout, brown, woolly, up to 7 cm long; lamina ovate rotundate, 8-20 cm diameter; 15-17-nerved; bifid c. 1/4-1/3 with more or less broad sinus; tip of lobes rounded; base very deeply cordate; upper surface almost glabrous except for the very base where the petiole is inserted; lower surface woolly-tomentose; connecting nerves strongly marked, perpendicular to the main nerves.

Inflorescence stout, terminal racemes, densely brown tomentose with axis up to 25 cm long, 5-7 mm thick, angular, c. l0-flowered; pedicels tomentose, 4-5 mm thick, 1.5-6 cm long, gradually merging into the 7-10 cm long hypanthium; bracts ovate, 10-15 mm long, caducous; bracteoles lanceolate, c. 10 mm, inserted at the base of the hypanthium.

Flowers: Buds ellipsoid-clavate, velvety brown, 2.5-4 by 1-1.5 cm. Calyx splitting into 5 reflexed, strap-shaped lobes, hairy on both sides. Petals creamy yellow, obovate, somewhat differing in size, the upper smaller than the lateral, 5-6 by 2-2.5 cm, densely velvety outside, sparsely hairy inside; claw 1-2 cm long. Stamens 3 fertile, yellowish-green; filaments 6-7 cm long, anthers c. 1 cm long, opening by a longitudinal slit; staminodes 2, c. 1 cm long. Ovary reddish-brownish hairy, stipe c. 1 cm, angulate, ovary c. 2 cm; style recurved, c. 1 cm, hairy except for the very apical part; stigma large, peltate, 3-4 mm diameter

Pods dehiscent, strap-shaped, 30-40 by 6-7 cm, densely rusty tomentose.

Seeds c. 10, flat, elliptic-ovate to orbicular, 2.5-3 cm diameter.

Malesia: endemic to Borneo where it has been collected in a few places in Sarawak (districts Kutei, Temiai and Kakus), and in Sabah (district Tenom).

Along riverbanks in primary forests and mixed dipterocarp forests at altitudes between 200 and 450 m.