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Sesbania bispinosa

Description from Flora of China

Aeschynomene bispinosa Jacquin, Icon. Pl. Rar. 3: 13. 1792.

Herbs, perennial, suffrutescent, 1-3 m tall. Branches te­rete, slightly with greenish white striations, often with small sparse flattened prickles. Stipules linear-lanceolate, ca. 7 × 1 mm, caducous, glabrous, apex acuminate. Leaves 40-80-folio­late; rachis 13-30 cm, abaxially with sparse prickles, adaxially grooved; stipels acerose, slender; leaflet blades linear-oblong, 10-16 × 2-3 mm, both surfaces with dense appressed purplish brown glands and glabrous, abaxially grayish green, adaxially green, base rounded, apex obtuse and with a mucro. Racemes 5-10 cm, 2-6-flowered; peduncle often with prickles; bracts linear-lanceolate, ca. 3 mm, caducous, with sparse appressed trichomes. Flowers 0.9-1.2 cm. Pedicel 6-8 mm, slender; brac­teoles 2, ovate-lanceolate, caducous, glabrous. Calyx campan­ulate, ca. 4 mm, glabrous; teeth 5, shortly triangular. Corolla yellow; standard subovate, ca. 1 cm, longer than wide, outside with reddish brown dots, with a triangular callus, base tapering into a claw, apex retuse; wings oblong, with long claw, auricu­late at one side; keel long obovate, with a dentiform auricle at base. Stamens 0.9-1.2 cm; anthers obovoid, outer side brown. Pistil linear, as long as stamens; style slender; stigma capitate. Legume dark brown, terete, straight to slightly falcate, 15-22 cm × ca. 3 mm, trabeculate, slightly constricted and with a ca. 5 mm separation between seeds, apical beak 1-1.2 cm. Seeds nu­merous per legume, subterete, ca. 3 × 2 mm; hilum rounded. Fl. and fr. Aug-Dec. 2n = 12, 13, 14.

The original distribution is uncertain, as this species is probably naturalized rather than native in some parts of its current distribution.

Moist places on mountain slopes and roadsides; below ca. 2000 m. Chongqing, Guangdong, Guangxi, Hainan, SW Sichuan, Yunnan [Bangladesh, Cambodia, India, Indonesia, Kashmir, Malaysia, Myan­mar, Pakistan, Sri Lanka, Thailand, Vietnam; Africa, Indian Ocean islands, Madagascar, Pacific Ocean islands].


 

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