Pycnostelma ASCLEPIADACEAE-CONVOLVULACEAE Ipomoea 



ciliate on the margins near the base, and green 5-merous fls. in delicate few-fld. cymes 

 in the axils of the upper Ivs. or bracts; pollen masses one in each cell, pendulous: 

 follicles acuminate; seeds comose. 2 species, in eastern Asia, both occurring in China. 

 (Greek: pychnos, dense, and stelma, crown.) 



1. Pycnostelma paniculatum (Bunge) K. Schum. (P. chinense Bunge ex Decne.) f^^ 

 m (Hsu Ch'ang Ch'ing) (DC.P. 8: 512). Slender herb, to lm.; fls. greenish, 

 VI-VII, infl. terminal; fr. IX-X. China; locally in Ki., Ku. Grassland. Fig. 305. 



147. CONVOLVULACEAE Morning Glory Family HMXtPr (Hsiian Hua K'o) 

 Twining herbaceous vines (ours); also erect herbs, shrubs and trees; sometimes 

 with latex; usually with alternate simple estipulate lvs.: fls. showy, perfect, regular, 

 5-merous; corolla mostly funnel-form, plicate, twisted in the bud; ovary superior, 2- 

 celled: fr. a 1-6-seeded capsule or berry. 50 genera with 1,200 species, cosmopolitan, 

 especially in the tropics; 11 genera and 50 species in China. 



Key to the Genera 



A. Lfy. creeping twining herbs; green, not parasitic. 



Stigmas 2, linear to ovate 1 . Convolvulus 



Stigmas capitate, sometimes lobed. 



Stamens and style not exserted:lvs. cleft, lobed or entire, not dissected 2. Ipomoea 



Stamens and style exserted; lvs. often dissected 3. Quamoclit 



AA. Leaffess parasitic twining herbs; never green 4. Cuscuta 



1. Convolvulus Linn. Bindweed tfevcM (Hsiian Hua Shu) 



Lvs. entire (rarely palmately lobed): fls. axillary, solitary, with 2 large persistent 

 bracts (ours) enclosing the calyx; sepals ovate or oblong, the inner smaller; stamens 

 included; filaments dilated at the base; anthers oblong; stigmas 2, linear to ovate; 

 ovary 1- (or imperfectly 2-) celled; capsule usually 4-seeded. 200 species, in warm 

 countries; 4 in China. (Latin: convolvere, to entwine.) 



Key to the Species 



Plants villous: lvs. oblong to linear, with mucronulate tip, 3-5 cm. long 1. ('. pellitus 



Plants glabrous or finely pubescent, not villous. 



Bracts 1.5-3.5 cm. long, just below the calyx; peduncles 1-fld 2. C. septum 



Bracts 0.8-1. 5cm. long, separated from the calyx; peduncles often 2-fld. 3. C. wallichianus 



1. Convolvulus pellitus Ledeb. (G.M. 1182). Trailing herb; fls. pink, VII. Asia; 

 locally in Ku. Rocky grassland. 



2. Convolvulus sepium Linn. {Calystegia sepium (L.) R. Br.) Hedge Bindweed ^/^ 

 (Hsiian Hua; Twisted Flower) (B.M. 819). Perennial trailing herb; fls. white 

 or pink, 5-7 cm. long, VI. Temperate regions; locally in Ar., Ki., Ku. Brushland. 

 Fig. 306. 



3. Convolvulus wallichianus Spreng. (Calystegia hederacea Wall, ex Roxb.) d^it 

 (Hsiao Hsiian Hua) (G.M. 1182, H.F. 4: 217). Trailing herb; fls. pink, 2-3 cm. 

 long, V. Asia; locally in An., Ku. Field weed. 



2. Ipomoea Linn. Morning Glory H'ffSI (Kan Shu Shu) 



Lvs. cleft, lobed or entire, not dissected: fls. axillary, solitary or cymose; corolla 



318 



