68. Indigofera hancockii Craib, Notes Roy. Bot. Gard. Edinburgh. 8: 53. 1913.
苍山木蓝 cang shan mu lan
Indigofera forrestii Craib.
Shrubs, 0.5-1.8 m tall. Stems light brown, with sparse scattered lenticels; young branches with appressed white and brown medifixed symmetrically 2-branched trichomes, glabrescent. Stipules lanceolate, 1.5-2 mm. Leaves 6-9 cm, (5-)9-19-foliolate; petiole and rachis adaxially grooved, with appressed medifixed trichomes; petiole 0.8-2 cm; stipels minute; petiolules ca. 1 mm; leaflet blades opposite, narrowly elliptic, 6-12(-18) × 4-6(-10) mm, both surfaces with sparse white and brown appressed medifixed trichomes, abaxially green, adaxially brown or black when dry, midvein abaxially prominent and adaxially impressed, secondary veins not visible, base broadly cuneate to rounded, apex rounded to truncate and mucronate. Racemes 6-12 cm, densely flowered; peduncle 4-15 mm; bracts ovate, ca. 1.5 mm, abaxially with appressed brown medifixed trichomes. Pedicel ca. 1.5 mm. Calyx 2-2.5 mm, with appressed brown medifixed trichomes; teeth triangular-lanceolate, as long as tube. Corolla red, 6-9 mm; standard elliptic, ca. 6.5 mm, outside with appressed medifixed trichomes; wings ca. 6.5 mm; keel ca. 4.5 mm, outside apically hairy. Stamens 6-7 mm; anthers broadly ovoid, glabrous, apex mucronate. Ovary hairy, with 9 ovules; style glabrous. Legume linear, cylindric, 3-4 cm, with sparse appressed medifixed trichomes; endocarp blotched. Fl. May-Aug, fr. Oct-Nov.
● Sunny slopes, near streams; 2400-2900 m. S Sichuan, Yunnan.
Indigofera hancockii is very closely related to I. franchetii and might be better treated as a variety of that species.