Cynanchum ASCLEPIADACEAE Pycnostelwa 



Key to the Species 

 a. Lvs. oblong or ovate. 



Fls. in pedunculate clusters: lvs. 3-9 cm. wide, with deep wide sinus, 



glabrous except on the nerves beneath 1 • C. auriculatum 



Fls. axillary, on slender pedicels: lvs. 1.5-3. Ocm. wide, with shallow 



sinus, puberulent 2. C. mooreanum 



aa. Lvs. linear or narrowly lanceolate. 



Plant glabrous: brs. slender: lvs. linear, 8-10 cm. long: fls. dark 



purple 3 . C. linearifolium 



Plant pubescent: brs. rather stout: lvs. linear to narrowly lanceolate, 



2. 5-6. Ocm. long: fls. white 4. C. sibiricum 



1. Cynanchum auriculatum Royle ex Wight jR&% (Fei Lai Hao; Flying Crane) 

 (H.F. 4: 25). Twining herb; fls. white, VIII-IX; fr. IX-X. Eastern Asia; locally 

 in An., Che., Hup., Ki., Ku. Grassland. 



2. Cynanchum mooreanum Hemsl. (Vincetoxicum chinense S. Moore) (J.B. 1875: 228, 

 F.H.E. 2: 108). Twining vine; fls. white, VI. Central China; locally in An., Che., 

 Hup., Ki. Woodland. 



3. Cynanchum linearifolium Hemsl. (F.H.E. 2: 107). Erect herb, sometimes suffr- 

 tescent, to 6dm. high; fls. dark purple, VII. Eastern and Central China; locally 

 in Hun., Ku. Brushland. 



4. Cynanchum sibiricum (L.) R.Br. {Vincetoxicum sibiricum Linn.) J&fgft ( Ti Shao 

 Hua) (DC. P. 8: 525). Erect herb, to 4 dm.; fls. white, VII-VIII. Northeastern 

 Asia; locally in Ku. Grassland. 



2. Metaplexis R. Br. MMM (Lo Mo Shu) 

 Vines, woody at the base, with cordate lvs. and with fls. in simple racemose cymes; 

 calyx with 5 glands inside at the base; corolla lobes densely stiff-hairy within (ours); 

 stamens attached to the base of the corolla: seeds comose. 2 species, in eastern Asia; 

 one in China. (Greek: meta, with, and pleco, to fold; in reference to the cucullate 

 appendages of the corona.) 



1. Metaplexis japonica (Thunb.) Miq. (M. chinensis (Bunge) Decne. ; M. stauntoni 

 Roem. & Schult.) MM (Lo Mo) (DC.P. 8: 511; F.H.E. 2:110). Twining herb; fls. 

 white, VI-VIII; fr. IX. Eastern Asia; locally in An., Ki., Ku. Grassland, brush- 

 land. Fig. 304. 



3. Pentasachme Wall, ex Wight 5l5feS (Wu Lai Shu) 

 Erect perennial glabrous herbs, usually with simple stems, narrow acuminate lvs. 

 and axillary umbels of 2 or a few yellowish 5-merous fls. on filiform peduncles; pollen 

 masses one in each cell, basally attached: follicles slender, terete; seeds comose. 4 

 species, in eastern Asia; 2 in China. (Greek: pente, five; and akme, a point; in re- 

 ference to the five scales in the throat of the corolla.) 



1. Pentasachme championi Benth. (Be.F. 228). Erect herb, to 0.5 m.; fls. white, 

 corolla lobes linear, VIII; fr. linear, X. Southern and central China; locally in 

 Hun., Ki. Wet places. 



4. Pycnostelma Bunge ex Decne. fe^MM (Hsu Ch'ang Ch'ing Shu) 

 Erect slender glabrous perennial herbs with linear-sublanceolate lvs, which are 



317 



