尖叶木蓝 jian ye mu lan

Indigofera benthamiana Hance; I. kotoensis Hayata; I. teysmanii Miquel.

Shrubs or small trees, erect, 1-3 m tall. Stems with slightly appressed medifixed symmetrically 2-branched trichomes. Stip­ules narrowly lanceolate, 5-8 mm, caducous. Leaves 20-25 cm, 11-19-foliolate; petiole and rachis with appressed white and brown medifixed trichomes; petiole 2-2.5 cm; rachis flattened and adaxially grooved; stipels spiculate, 1.5-2 mm; petiolules 2-3 mm, with appressed trichomes; leaflet blades opposite, ovate-lanceolate, 3-6 × 1.5-2 cm, papery, both surfaces with appressed medifixed trichomes, midvein prominent, secondary veins 13 or 14 on each side of midvein and obvious, base rounded to broadly cuneate, apex acuminate. Racemes 7-13 cm, densely flowered; peduncle with appressed or spreading rust-colored trichomes; bracts lanceolate, ca. 1.5 mm. Pedicel as long as bracts, with appressed brown trichomes. Calyx 1-2 mm, with dense appressed grayish brown trichomes; tube ca. 1 mm; teeth triangular, ca. 0.5 mm. Corolla white or purple; standard ovate-lanceolate, 6.5-8 mm, outside with dense appressed brown trichomes; wings as long as standard, margin ciliate; keel 7-7.5 mm, outside with dense appressed brown trichomes. Sta­mens 5-6.5 mm; anthers ellipsoid, base with a few trichomes. Ovary glabrous. Legume cylindric, spreading, 2.5-4.5 cm × 5.5-6 mm, sparsely hairy; endocarp blotched. Seeds 10-16, dis­coid, ca. 2 mm in diam., arranged like a pile of coins. Fl. Jun-Sep, fr. Oct-Dec. 2n = 16.

Sunny places, trailsides, forests; 400-600 m. Guangdong, Guang­xi, Hainan, Taiwan, S Yunnan [Indonesia, Japan, Laos, Malaysia, Philip­pines, Thailand, Vietnam].