海南鱼藤 hai nan yu teng

Derris hainanensis Hayata, Icon. Pl. Formosan. 3: 77. 1913.

Lianas. Branches terete, glabrous, with scattered elliptic lenticels. Stipules oblong-triangular, pilose, apex acute. Leaves 13- or 15-foliolate; rachis 8-15 cm, including petiole (4.5-)6-8 cm; leaflet blades obovate to long elliptic, 4-7 × 1.8-3.5 cm, membranous, both surfaces glabrous, abaxially olive-green and slightly whitish green, base broadly cuneate to sometimes sub­rounded, apex caudate-acuminate to cuneate. Cymose pseudo­panicles axillary, 10-15 cm. Pedicel 1-2 cm. Calyx campanu­late, ca. 4 × 7 mm, subglabrous. Corolla whitish; standard sub­orbicular, ca. 1.5 cm, claw ca. 3 mm, limb base cordate and with 2 triangular calluses, apex emarginate. Ovary linear, hir­sute. Legume oblong to ligulate, 4.5-10 × ca. 2 cm; abaxial su­ture with a 1-2 mm wide wing, adaxial suture with a 3-4 mm wide wing. Seeds 1 or 2 per legume. Fl. Apr-Jun, fr. Jul-Oct.

● Open forests, scrub on mountain slopes. Hainan.