Youngia humifusa (Dunn) Y. L. Peng & X. F. Gao, 2014

Youngia humifusa (Dunn) Y. L. Peng & X. F. Gao View in CoL , comb. nov.

Basionym:— Lactuca humifusa Dunn (1903: 512) .

Homotypic synonyms:— Ixeris humifusa (Dunn) Stebbins (1937: 50) ≡ Paraixeris humifusa (Dunn) C. Shih (1993: 547) ≡ Crepidiastrum humifusum (Dunn) Sennikov (1997: 115) .

Type:— CHINA. Hubei: Badong, A. Henry 4761 ( K) .

Notes: —Herbs 15–40 cm tall, perennial, with long creeping stolons covering ground. Flowering and fruiting time is usually from June to September. This species is endemic in China, and is an unusual species in Youngia growing in warm and humid habitats.

Ecology: —Deciduous broad-leaved forests; elevations of 1390–1828 m.

Distribution: — CHINA. Hubei: Shenglongjia, Dayanwu; Hunan: Shangzhi, Badagongshan; Shanxi: Pingli, Qianjiaping, Fengjialiang.

Specimens examined: — CHINA. Hubei: Shenglongjia , Dayanwu, 236-6 Te am 2661 ( PE) , 1700 m elevation, under forest, 9 July 1976; Shenglongjia, Dayanwu,Tongping , 236-6 Te am 2469 ( PE) , 1650 m elevation, 30 June 1976; Shenglongjia, Dayanwu, Gaotangping , Y.L. Peng & L.J. Tong 981 ( CDBI) , 31.50.49° N, 110.31.49° E, damp and shaded place under deciduous broad-leaved forests, 6 August 2012; Shenglongjia, Hongping, Yanziya , Y.L. Peng & L.J. Tong 1012 ( CDBI) , 1650 m elevation; 31.44.87°N, 110.28.52°E, damp and shaded places under deciduous broad-leaved forests, 6 August 2012; Badong, Nanping , T. P. Wang 11124 ( PE) , 1700 m elevation, shaded and damp places in valley. Hunan: Shangzhi, Badagongshan ; Phytochemistry department 336 ( PE) , 1989. Shanxi: Pingli, Qianjiaping, Fengjialiang , X.F. Gao 13147 ( CDBI), damp place near forest edges, 1650 m, 10 June 2011 .