Nerium APOCYNACEAE ASCLEPIADACEAE Cynanchum 



VIII. Mediterranean region; locally in An., Ki., Ku., Planted, ornamental. Fig. 

 303. 



3. Trachelospermum Lem. Climbing Dogbane j|Hi (Lo Shih Shu) 

 Evergreen twining shrub with opposite lvs. and white cymose fls. ; calyx with 5- 

 10 glands or scales inside at the base; anthers united and joined to the stigma: folli- 

 cles elongated and terete; seeds linear, with a tuft of long hairs. 16 species, tropical 

 and subtropical regions, eastern Asia; 7 in China. (Greek: trachelos, neck, and s per ma, 

 seed.) 



Key to the Species 



Anthers wholly included within the corolla-throat 1 . T. jasminoides 



Anther-tips more or less exserted from the orifice of the corolla-tube 2. T. gracilipes 



1. Trachelospermum jasminoides (Lindl.) Lem. Star Jasmine |g-H (Lo shih; Rock 

 Rope) (R.M. 798). Twining shrub; fls. white, IV-VI; fr. IX-X. China, Formosa, 

 Indo-China, Japan; locally in An., Che., Hun., Hup., Ki., Ku. Brushland, woodland. 



2. Trachelospermum gracilipes Hook. f. (Suny. 3: 91). Twining shrub; fls. white, 

 VI-VII; fr. VIII-IX. China, Formosa, Indo-China; locally in Che., Hup., Ki. 

 Rocky woodland. 



146. ASCLEPIADACEAE Milkweed Family H^j$ (Lo Mo K'o) 



Herbs (ours) or shrubs, often twining, with latex and usually with opposite entire 

 estipulate lvs.: fls. perfect, regular, 5-merous; corona usually present as an outgrowth 

 of the corolla or stamens or both; filaments united: anthers joined to the stigma; 

 pollen cohering into waxy masses called pollinia: fr. of 2 follicles. 75-320 genera with 

 1,800 species, tropical and subtropical regions. 23 genera and 65 species in China. 



Key to the Genera 



A. Plant vining or decumbent in habit: corolla lobes twisted in the bud; 

 corona lobes fully united. 



Corolla lobes glabrous 1 . Cynanchum 



Corolla lobes densely stiff -white-hairy within (ours) 2. Metaplexis 



AA. Plants erect. 



Infl. mostly lateral; fls. in axillary clusters; pedicels up to one cm. 

 long: lvs. glabrous. 

 Corolla lobes ovate-oblong, fleshy or at least thickened at the base 1. Cynanchun 



Corolla lobes linear, membranous 3. Pentasachme 



Infl. mostly terminal; fls. in slender erect panicles, some from the 

 axils of the upper lvs.; pedicels often over one cm. long: lvs. 

 ciliate on the margins near the base 4 . Pycnostehna 



1. Cynanchum Linn. ftfiM (Pai Wei Shu; White Rose Genus) 

 Erect or twining herbs or shrubs with cordiform or hastate lvs. and greenish or 

 purplish fls.; corolla lobes glabrous or pubescent; corona flat and simple; pollen masses 

 waxy, one pendulous in each cell: follicles terete or with 2 short wings; seeds with 

 a tuft of long hairs. 100 species, tropical and temperate regions; 27 in China. (From 

 the Greek terms meaning "dog", and "to strangle.") 



316 



