Senna hirsuta (L.) H. S. Irwin & Barneby

hirsuta: covered with long, moderately stiff and not interwoven hairs; hirsute

Herbaceous shrub, up to c. 2 m tall, sometimes softly woody near the base. Stems ridged, densely hairy. Leaves paripinnate with 4-5 pairs of leaflets; leaflets 2.8-10.5 cm long, terminal par usually largest, elliptic to ovate, pointed at the apex, hairy on both surfaces; petiole 3-6.6 cm long densely hairy, with a single large cone-shaped gland near the base of the petiole. Stipules linear, 6-7 mm long, frilled with long hairs. Inflorescences axillary c. 3 cm long. Flowers orange-yellow with darker brown veins when older. Pods 6-13 cm long, straight or slightly curved, covered in long whitish hairs.

Local

Native to South America and the West Indies. A widespread weed in tropical Africa and Asia.

Mar/jun

Chile Central

Subarbusto

Perene

Sementes

Brasil

Ditremexa hirsuta (L.) Britton & Rose; Britton & Wilson, Sci. Surv. Porto Rico and Virgin IsL S: 372. 1924.
Cassia hirsuta L. Sp. PI. 378. 1753.
(?) Cassia caracasana Jacq. Hort. Schoenbr. 3: 11. 1798.
Hirsute, 1.5 m. high or less, perennial. Stipules linear, deciduous; petioles 3-8 cm. long, bearing a stout gland near the base; leaflets 3-5 pairs, ovate to ovate-lanceolate, acute or acuminate, 4-7 cm. long; flowers in short axillary racemes; peduncle shorter than the subtending petiole; bracts short, deciduous; sepals oblong, obtuse, 7-9 mm. long, hirsute; petals twice as long as the sepals; legume linear, densely hirsute, somewhat curved, 8-15 cm. long, 5-7 mm. wide; seeds transverse.
Type locality: America.
Distribution: Jamaica; Porto Rico; Guadeloupe; Martinique; St. Vincent; Tobago; Trinidad. El Salvador. Colombia to Dutch Guiana, Ecuador and Brazil.

Perennial, Shrubs, Herbs, Stems woody b elow, or from woody crown or caudex, Stems erect or ascending, Stems or branches arching, spreading or decumbent, Stems less than 1 m tall, Stems 1-2 m tall, Stems or young twigs sparsely to densely hairy, Stems silvery, canescent, tomentose, cobwebby, or wooly, Leaves alternate, Leaves petiolate, Extrafloral nectary glands on petiole, Stipules inconspicuous, absent, or caducous, Stipules conspicuous, Stipules setiform, subulate or acicular, Stipules persistent, Stipules deciduous, Stipules free, Leaves compound, Leaves even pinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 5-9, Leaflets 10-many, Leaves glabrous or nearly so, Flowers in axillary clusters or few-floweredracemes, 2-6 flowers, Inflorescences racemes, Inflorescence panicles, Inflorescence axillary, Inflorescence terminal, Bracts very small, absent or caducous, Flowers actinomorphic or somewhat irregular, Flowers zygomorphic, Calyx 5-lobed, Calyx hairy, Petals separate, Petals orange or yellow , Fertile stamens 6-8, Stamens heteromorphic, graded in size, Stamens completely free, separate, Filaments glabrous, Anthers opening by basal or terminal pores or slits, Style terete, Fruit a legume, Fruit stipitate, Fruit unilocular, Fruit freely dehiscent, Fruit elongate, straight, Fruit strongly curved, falcate, bent, or lunate, Fruit exserted from calyx, Fruit internally septate between the seeds, Fruit compressed between seeds, Fruit hairy, Fruit 11-many seeded, Seed with elliptical line or depression, pleurogram, Seeds ovoid to rounded in outline, Seed surface smooth, Seeds olive, brown, or black.

Senna hirsuta là một loài thực vật có hoa trong họ Đậu. Loài này được (L.) H.S.Irwin & Barneby miêu tả khoa học đầu tiên.

毛決明（学名：Senna hirsuta）为豆科決明屬下的一个种。