Senna mexicana (Jacq.) H. S. Irwin & Barneby

Adipera mexicana (Jacq.) Britton & Rose
Cassia mexicana Jacq. Hort. Schonbr. 2: 41. 1797.
Cassia foetidissima R. & P.; G. Don. Gen. Hist. 2: 41. 1832.
A shrub, 2-5 m. high, much branched, the branches, petioles and rachis tomentose. Stipules small, linear, spreading, caducous; leaflets 3-8 pairs, 8-20 mm. long, oval to oblong, obtuse, glabrous above, somewhat pubescent beneath, ciliate; gland between the lower pair of leaflets cylindric, black, obtuse; inflorescence paniculate, the racemes few-flowered; bracts small, linear; pedicels elongated; sepals orbicular, obtuse, pubescent; petals 2-3 times as long as the sepals, obtuse; legume about 5 cm. long.
Type locality: Mexico. Distribution: Mexico; Hispaniola.

Perennial, Trees, Shrubs, Woody throughout, Stems woody below, or from woody crown or c audex, Stems erect or ascending, Stems or branches arching, spreading or decumbent, Stems less than 1 m tall, Stems 1-2 m tall, Stems greater than 2 m tall, Stems solid, Stems or young twigs glabrous or sparsely glabrate, Stems or young twigs sparsely to densely hairy, Leaves alternate, Leaves petiolate, Extrafloral nectary glands on petiole, Stipules inconspicuous, absent, or caducous, Stipules setiform, subulate or acicular, 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, Inflorescences racemes, Inflorescence panicles, Inflorescence axillary, Inflorescence terminal, Bracts very small, absent or caducous, Flowers actinomorphic or somewhat irregular, Calyx 5-lobed, Calyx glabrous, 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 oblong or ellipsoidal, Fruit strongly curved, falcate, bent, or lunate, Fruit exserted from calyx, Fruit compressed between seeds, Fruit glabrous or glabrate, 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 mexicana là một loài thực vật có hoa trong họ Đậu. Loài này được (Jacq.) H.S.Irwin & Barneby miêu tả khoa học đầu tiên.