薄叶猪屎豆 bao ye zhu shi dou

Crotalaria peguana Bentham ex Baker; C. peguana var. qiubeiensis (C. Y. Yang) C. Chen & J. Q. Li; C. qiubeiensis C. Y. Yang.

Herbs or shrublets, erect, 0.6-1.5 m tall. Branches terete, appressed pubescent. Stipules acicular, very minute. Leaves simple; petiole 1-2 mm; leaf blade narrowly elliptic, 6-11 × 2-3 cm, thinly to thickly papery, abaxially silky pubescent, adax­ially glabrous or pilose, veins abaxially raised, base attenuate to slightly cuneate, apex acuminate. Racemes terminal, to 20 cm, many flowered; bracts linear, 2-4 mm. Pedicel 3-5 mm; brac­teoles inserted at base of calyx tube or on middle of pedicel, similar to bracts. Calyx 2-lipped, 0.8-1.2 cm, parted nearly to base, pubescent; lobes linear, linear-lanceolate, or broadly lan­ceolate, apex acuminate. Corolla yellow, included in or ± as long as calyx; standard oblong to ovate-oblong, 0.8-1.2 cm, base with 2 appendages, apically barbate; wings oblong, 8-10 mm, apex obtuse; keel ca. 9 mm, rounded, apex with a long twisted beak. Ovary subsessile. Legume oblong, 1-2(-2.5) × 0.5-1 cm, 8-15-seeded, glabrous. Fl. Jun-Oct, fr. Sep-Dec.

Thickets, open woodlands; 800-1500 m. Guangxi, Yunnan [Bangladesh, India, Laos, Myanmar, Thailand, Vietnam].

Collections with more broadly lanceolate calyx lobes have been treated as Crotalaria peguana var. qiubeiensis.