苞护豆 bao hu dou

Young stem winged, long appressed hairy. Petiole 7-10 cm; leaflet blade oblong, (5-)8-13 × (2-)4-5(-6.5) cm, abaxi­ally densely grayish yellow pubescent, adaxially glabrous, base rounded to slightly cordate, sometimes emarginate, apex obtuse. Inflorescence 10-15 cm, retrorsely strigose, ca. 14 flowers per bract; bracts boat-shaped, enlarging after anthesis, 2.5-3.8 cm, veined, abaxially glabrous, adaxially strigose. Flowers 1.2-1.4 cm; pedicel short, 2-3 mm, retrorsely strigose. Calyx strigose, 5-lobed; lower 3 lobes ovate, upper 2 lobes connate, triangular. Corolla white, ca. 1 cm; standard nearly orbicular; wings ob­long; keel nearly erect, apex obtuse. Ovary shortly stipitate, with an annular disk around base. Legume ovoid, ca. 8 × 5 mm, retrorsely strigose, apex acute. Seed brown, reniform, ca. 5 × 5 mm. Fl. and fr. Sep-Nov.

Sunny slopes, mixed forests, thickets; 200-900 m. SW Guangxi, S Yunnan [Laos, Myanmar, Thailand].