Observations
A foetid smelling herb or undershrub, up to 1 m tall, almost glabrous, with a stout taproot; leaves with 3 pairs of leaflets, petiole 1-4 cm long, rachis 2-3 cm long, with a subulate, 2 mm long gland between the two lowest pairs of leaflets, leaflets obovate, 2-5 cm x 1.5-2.5 cm, upper leaflets largest, thin, base cuneate to rounded, apex rounded; inflorescence a short axillary raceme, 1-2(-3)-flowered; flowers with ovate sepals, 5 mm x 2-4 mm, petals obovate, unequal, up to 10 mm x 6 mm, yellow, stamens 7, almost equal, filaments 1.5-2 mm long, 3 larger anthers, 4 smaller ones 1.5-2.5 mm long, staminodes absent, ovary densely pubescent, style glabrous, stigma truncate; fruit linear, terete, 10-15 cm x 0.5 cm; seeds 20-30 per pod, rhomboidal, 5 mm x 3 mm, glossy, with an areole (1.5-2 mm wide) covering part of the seed surface. Senna tora is common throughout South-East Asia in anthropogenic habitats at lower altitudes. It is reported to be an important weed in pastures and cropped fields in South-East Asia, partly because of its high seed production.
Selected Sources
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