单耳密花豆 dan er mi hua dou

Climbing shrubs. Branchlets terete, pilose. Petiole 5-10 cm; stipels subulate, as long as or slightly shorter than petio­lules; petiolules 4-5 mm; terminal leaflet elliptic or obovate-elliptic, 11-15 × 5-7.5 cm, symmetric, lateral ones as large as terminal, narrowly ovate, asymmetric, thickly papery, puberu­lent and strigose along midrib and lateral veins abaxially, gla­brous adaxially, lateral veins 8 or 9 pairs, raised on both sur­faces, reticulate veinlets slender, conspicuous, base cuneate or subrounded, apex rounded, mucronate. Panicles axillary; rachis not elongated, shorter than branches, 5-10 cm; branches crowded, spreading, to 15 cm, densely yellowish brown pu­berulent. Flowers purple, crowded together. Calyx ca. 5 mm, yellowish brown puberulent on both sides; teeth 1.5-1.7 mm, upper 2 ± connate, emarginate, lower 3 ovate, apex obtuse or slightly acute. Standard suborbicular, 6-7 mm in diam., apex emarginate, base cuneate, claw ca. 2 mm; wings obovate-ob­long, 5.5-6 mm, base with a long obtuse auricle on one side, claw ca. 3 mm; keel shorter than wings, nearly equal in shape, ca. 3.5 mm, base with a long obtuse auricle, claw ca. 3.5 mm. Anthers 5 larger and 5 smaller. Ovary narrow, sessile, ca. 3.5 mm. Legumes not seen. Fl. Mar.

● Dense forests in mountain regions; ca. 900 m. S Yunnan (Xi­shuangbanna).