Senna divaricata

Author: (Nees & Blume) K. Larsen

de Wit, Webbia 11 (1956) 242, f. 2

Morphological description
Shrub up to 5 m high. Stipules linear-falcate, 8-10 mm, pubescent.

Leaves paripinnate with 6-11 pairs of leaflets; petiole ribbed, 1-2 cm, glabrous to puberulous; rachis 5-8 cm, ribbed, thinly pilose with a 2 mm long, clavate gland between the lowermost pair of leaflets and a spindle-shaped gland between the uppermost pair and often gland-like hairs between the other leaflets; petiolules 1-2 mm. Leaflets elliptic-oblong, 1.5-4.5 by 0.5-1.5 cm, upper surface glabrous, lower at first sparsely pilose along the margin, apex rounded, base rounded to acute.

Inflorescence: Racemes axillary, single or two together, 2-or 3-flowered; peduncle glabrous, 1.5-3 cm; bracts boat-shaped, glabrous, 1-2 mm; bracteoles absent; pedicels 10-22 mm long.

Flower: Sepals 5, ovate-orbicular, glabrous, unequal, 2 outer only 1/3 of the 3 inner, 4-11 mm long. Petals 5, yellow (orange brown in dried specimens), broadly ovate, short clawed, glabrous, unequal, 1.5-2.5 cm long. Stamens 10: 3 with filaments glabrous, 3 mm long and anthers curved, c. 10 mm with a 2 mm crest, opening by a single apical pore; 7 smaller with very short filaments and anthers slighter smaller, straight and without a pronounced crest, opening by two apical pores; filaments of all stamens straight. Ovary subsessile, sparsely puberulous; style glabrous; stigma inconspicuous.

Pods strap-shaped on a slender stalk and with a persistent, more or less swollen hypanthium, flat, glabrous, 15-20 by 0.5-0.7 cm.

Seeds 15-50, flattened, narrowly ovoid, c. 5 mm long.

Malesia: Java, Philippines (Luzon), Lesser Sunda Islands (Bali).

Occurring near water courses or on marshy soil, in secondary forests and in clearings, usually scattered or few together, up to 2700 m.