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FOC | Family List | FOC Vol. 10 | Fabaceae | Crotalaria

35. Crotalaria dubia Graham ex Bentham, London J. Bot. 2: 565. 1843.

卵苞猪屎豆 luan bao zhu shi dou

Herbs, annual, 1-1.5 m tall. Stems terete, densely pubes­cent. Stipules filiform, caducous. Leaves simple; petiole short; leaf blade obovate to ovate-oblong, 3-5 × 1.5-3 cm, thickly papery, both surfaces densely rusty pilose, veins abaxially raised, base cuneate, apex obtuse to acuminate and mucronate. Racemes terminal, congested and headlike, many flowered; bracts ovate-triangular, 6-7 mm. Pedicel ca. 1 mm; bracteoles inserted at base of calyx tube, similar to bracts. Calyx 2-lipped, 8-10 mm, divided for ca. 1/2 its length; lobes lanceolate. Co­rolla yellow; standard oblong, ca. 5 mm, base with 2 appen­dages, apex obtuse to retuse; wings narrowly elliptic, ± as long as standard; keel slightly rounded, narrowed apically from mid­dle and extended into a long beak. Legume ovoid, 5-7 mm in diam., included in calyx, 6-8-seeded, glabrous. Fl. Oct-Nov, fr. Dec-Feb.

By streams, wetlands; ca. 1000 m. Yunnan [Bangladesh, India, Myanmar, N Thailand].


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