Indigofera pseudonigrescens X.F. Gao & Xue Li Zhao, 2015

Zhao, Xue-Li & Gao, Xin-Fen, 2015, Indigofera pseudonigrescens (Fabaceae: Papilionoideae): A new species from Sichuan, China, Phytotaxa 222 (4), pp. 251-258 : 255-257

Indigofera pseudonigrescens X.F. Gao & Xue Li Zhao , sp. nov. ( Figs. 3 , 4 ).

Type:— CHINA. Sichuan: Miansha Town, Mianning County, 1400 m, 28°26’57’’N, 101°52’20’’E, 2 August 2007, X. F. Gao et al. 9796 (holotype CDBI!, isotypes CDBI!).

Shrubs, erect, 50–100 cm tall. Stems reddish brown; young braches green, striate, with appressed white and brown medifixed symmetrically 2-branched trichomes. Stipules linear, ca. 3mm. Leaves 2–10 cm, 5–13-foliolate; petiole and rachis with dense appressed medifixed trichomes; petiole 0.4–1.5 cm; rachis adaxially grooved; stipels narrowly triangular, ca. 1 mm; leaflet blades opposite or subopposite, elliptic to obovate-elliptic, (0.7–)1–2.5 × 0.4–1.2 cm, papery, abaxially with short appressed medifixed trichomes, adaxially with dense longer appressed medifixed trichomes, base broadly cuneate to rounded, apex obtuse and mucronate. Racemes (3–)5–19(–26) cm; peduncle ca. 0.5–2.3 cm; bracts linear, 1–1.5 mm, abaxially with brown medifixed trichomes, caducous. Pedicel ca. 1 mm, with brown medifixed trichomes. Calyx 2–2.5 mm, with appressed brown and white medifixed trichomes; tube ca. 1 mm; teeth narrowly triangular, 1–1.5 mm. Corolla red to purple; standard ovate, 4–6 × 2–3 mm, outside with appressed brown and white medifixed trichomes, apex acute, inside apex hairy; wings ca. 4 mm, margin ciliate; keel slightly longer than wings, outside apically with appressed brown and white trichomes, spur ca. 1 mm. Stamens 4–5 mm; anthers ovoid-globose, base with a few trichomes. Ovary glabrous. Legume cylindric, with dense appressed brown and white trichomes when young. Fl. Jun.–Sep., fr. unknown.

Distribution and habitat:— Indigofera pseudonigrescens is known from Mianning and Yanbian County in southwestern Sichuan, growing on roadside, hill slopes, forest margins at elevation of 1400–2000 m.

Etymology:— The epithet refers to its resemblance to Indigofera nigrescens .

Additional specimens examined:— CHINA. Sichuan Province: Mianning County, Maidigou Town , 28° 19’14’’N, 101°54’26’’E, 1500 m, 4 July 2014, X. L. Zhao 2014-1 ( CDBI) ; Yanbian County, Gesala Town , 27°04’14’’N, 101°20’27’’E, 1760 m, 29 July 2007, X. F. Gao et al. 9738 ( CDBI) .

Figures

FIGURE 3. Indigofera pseudonigrescens.—A. Branch.—B. Habit.—C. Inflorescens.—D and E. Magnified flower, showing standard, wings, keel, stamen, and pistil.

FIGURE 4. Indigofera pseudonigrescens.—A. Habit.—B. Leaflet blade above, showing detail of pilosity.—C. 2-branched trichomes.— D. Flower.—E. Standard.—F. Wing.—G. Keel.—H. Stamens and pistil.—I.Anther.—J. Calyx. Illustration drawn by Jian Li based on the holotype, X.F. Gao et al. 9796-10.