Sesbania emerus (Aubl.) Urb.

Sesban emerus (Aubl.) Britton & Wilson, Sci. Surv Porto Rico 5: 395. 1924.
Aeschvnomene Emerus Aubl. PI. Guian. 775. Tabl. Nomsl. 1775.
Coronilla occidentalis Willd. Sp. PI. 3: 1147. 1803.
Sesban occidentalis Poir. in Lam. Encyc. 7: 129. 1806.
Sesbania occidentalis Pers. Syn. PI, 2: 316. 1807.
? Sesbania macrocarpa Muhl.; Ell. Bot. S. C. & Ga. 2: 221. 1823.
Emerus Sesban occidentalis Kuntze, Rev. Gen. 181. 1891.
Sesbania Emerus Urban, Repert. Sp. Nov. 16: 149. 1919.
Stem shrubby, at least at the base, 2-5 m. high, glabrous, more or less angled; stipules linear-subulate, caducous; leaves 7-18 cm. long; leaflets 24-50, linear oblong, 1.5-3 cm. long. 3-7 mm. wide, rounded at each end, glabrous or with a few scattered hairs when young; racemes 5-10 cm. long, much shorter than the leaves, 3-6-flowered; bracts and bractlets linear, 5 mm. long, caducous; calyx about 8 mm. long, 7 mm. wide; lobes with a triangular base, acuminate, 2-2.5 mm. long, more or less mottled; corolla yellow, 15-20 mm. long; banner dotted with dark-purple; wings oblong-oblanceolate; blades of the keel-petals with a triangular basal auricle; pod straight, about 2 dm. long, 3.5-4 mm. wide, 30-40-seeded; seeds oblong, 3 mm. long, 2 mm. wide.
Type locality: Not given.
Distribution: Florida; Veracruz; Morelos; Guatemala; Panama; West Indies.

Perennial, Shrubs, Herbs, Stems woody below, or from woody crown or caudex, Taproot present, Nodules present, Stems erect or ascending, 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, Leaves alternate, Leaves petiolate, 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, Stipels present at base of leaflets, Leaflets 10-many, Leaves glabrous or nearly so, Flowers in axillary clusters or few-floweredracemes, 2-6 flowers, Inflorescences racemes, Inflorescence axillary, Bracteoles present, Flowers zygomorphic, Calyx 5-lobed, Calyx glabrous, Petals separate, Corolla papilionaceous, Petals clawed, Petals orange or yellow , Petals bicolored or with red, purple or yellow streaks or spots, Banner petal suborbicular, broadly rounded, Wing petals narrow, oblanceolate to oblong, Wing petals auriculate, Wing tips obtuse or rounded, Keel petals auriculate, spurred, or gibbous, Keel abruptly curved, or spirally coiled, Keel tips obtuse or rounded, not beaked, Stamens 9-10, Stamens diadelphous, 9 united, 1 free, Filaments glabrous, Style terete, Fruit a legume, Fruit stipitate, Fruit unilocular, Fruit tardily or weakly dehiscent, Fruit elongate, straight, Fruits quadrangulate, Fruit or valves persistent on stem, Fruit exserted from calyx, Fruit compressed between seeds, Fruit glabrous or glabrate, Fruit 11-many seeded, Seeds ovoid to rounded in outline, Seed surface smooth, Seeds olive, brown, or black.

Sesbania emerus là một loài thực vật có hoa trong họ Đậu. Loài này được (Aubl.) Urb. miêu tả khoa học đầu tiên.