4. Hylodesmum laxum (Candolle) H. Ohashi & R. R. Mill, Edinburgh J. Bot. 57: 178. 2000.
疏花长柄山蚂蝗 shu hua chang bing shan ma huang
Herbs, erect, 30-100 cm tall. Stem woody at base. Leaves 3-foliolate, clustered at apex or scattered along stem; petiole 3-9 cm, pubescent; terminal leaflet blade broadly ovate, ovate, or lanceolate, 5-12 × 1.1-5.5 cm, both surfaces subglabrous or abaxially slightly pubescent, base orbicular, margin entire, apex acuminate. Racemes terminal or terminal and axillary, often branched, to 30 cm, laxly flowered, 2- or 3-flowered at each node. Pedicel 3-4 mm, elongated to 4-10 mm at fruiting. Calyx ca. 2 mm; lobes shorter than tube. Corolla pink, 4-6 mm; standard elliptic, clawed; wings narrowly elliptic, auriculate and shortly clawed at base; keel obtuse, clawed, not auriculate. Legume often 2-4-jointed; articles slightly broadly subobovate, (6-)9-10 × ca. 4 mm or smaller, hooked pubescent; stipe 4-10 mm; fruiting pedicel 4-10 mm. Fl. and fr. Aug-Oct.
Broad-leaved forests on mountain slopes, grassy riversides, streamsides in forests; 700-1400 m. Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hubei, Hunan, ?Jiangxi, Taiwan, Xizang, Yunnan [Bhutan, India, Indonesia, Japan, Laos, Nepal, Philippines, Sri Lanka, Thailand, Vietnam].
