Vasilis Teodoridis:
Fabaceae | Millettia
10. Millettia pachyloba Drake; J. Bot. (Morot). 5: 187. 1891.
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Callerya pachyloba (Drake) H. Sun; Derris lasiopetala Hayata; Millettia lasiopetala (Hayata) Merrill; M. obovata Gagnepain; M. pachyloba var. lasiopetala (Hayata) P. K. Lôc.
Lianas; to 20 m. Bark yellow; splitting longitudinally. Branches straight; hollow; densely brown sericeous; glabrescent; sparsely scattered with large lenticels. Leaves 9-foliolate; rachis 25-35 cm; including petiole 6-8 cm; stipels acicular; ca. 3 mm; leaflet blade elliptic-oblong to obovate-oblong; 7-17 x 3-5.5 cm; papery; abaxially yellow sericeous; secondary veins 13-17 on each side of midvein; base rounded; apex acute to obtuse and sometimes emarginate. Pseudoracemes axillary near apex of branchlets; 20-30 cm; brown sericeous; rachis nodes with 3-7 flowers clustered on a 4-5 mm spur. Pedicel 2-3 mm. Flowers 1.2-1.5 cm. Calyx ca. 3 x 4-5 mm; sericeous. Corolla lilac; standard without basal calluses; outside sericeous. Ovary sericeous; with 4-6 ovules. Legume rhomboid-oblong; 5-8 x 3-4 cm; inflated; woody; yellow tomentose; base rounded; apex beaked. Seeds 1-4 per legume; dark brown; ovoid; shiny; 1.8-2 x ca. 1.5 cm. Fl. Apr-Jun; fr. Jul-Nov.
Evergreen broad-leaved forests in valleys; below 1500 m. Guangdong; Guangxi; SW Guizhou; Hainan; SW Hunan; Yunnan [Vietnam].
Millettia pachyloba is represented in China by the typical variety. Another variety; Millettia pachyloba var. spireana (Gagnepain) P. K. Lôc; occurs in Cambodia; Laos; Thailand; and Vietnam.