Cynanchum thesioides A erect plant with part of horizontal rhizome B scandent plant with part of horizontal rhizome C leaves, a, b, i from the holotype of Cynanchum sibiricum var. gracilentum (TI [00204077]) c, d from I.A. Gubanov & Grubov 243 (MW [MW0187936]) which had been identified as C. gobicum; j from I.A. Gubanov 3322 (MW [MW0187934]) which had been identified as C. gobicum k from the holotype of C. gobicum (LE [LE01036905]) l from G.M. Zhang et al. 070714 (BJFC [BJFC00062407]) m from the holotype of Cynanchum sibiricum var. latifolium (TI [00204080]) D horizontal rhizome and root E inflorescence with buds F flowering inflorescence G bud with glabrous corolla H bud with puberulent corolla I flower with corona shorter than anther appendages (side view) J flower with corona longer than anther appendages (front view) K flower with corona shorter than anther appendages (vertical view) L flower with glabrous corolla and corona longer than anther appendages (vertical view) M part of flower showing two corolla lobes adaxially densely puberulent (vertical view) B, C (e, f), E, G, I, K and L from Meng Wei in C.F. Zhang 6791 (HIB) F from C.F. Zhang 5588 H from X.Y. Liu & F. Zhao 00283 (HIB [0101691]) M from K.T. Fu 206 (HIB [0101693]) A by Shun-Bang Zhao in Xining; B, C (e, f), E, I, K and L by Miao Liao C (g, h) in Xilinhot and J in Beijing by Xin-Xin Zhu D by Jia-Hao Shen in Nanjing F, G and H by Cai-Fei Zhang M by Ye-Chun Xu in Beijing.