170 
8. Stem erect ay Mee Ae a 9. 
Stem twining i 10. 
9. Petals weflexed, "tainen raised on a 
short tube ... 3. Asclepias. 
Petals spreading stamens sessile 6. Cynanchum. 
10. Corona 0 : SS Ans e 4. Gymnema. 
Corona of 5 sc ll 
j= 
- 
. Marsdenia. 
Cynanchum, etc. 
ads es 
. Corolla narrow-campanulaie 
Corolla rotate 
D w 
1.—CRYPTOLEPIS. 
— Wall.;: Hook, f. Fl. Brit. Ind. Lantao 
Island and Shatin Boad, Hongkong Nev aa ; 
French Island, Whampoa; along the Canton River ; 
White Cloud hills, near Canton ; West River. FI. 
yellow, June. 
m 
ea 
2.—TOXOCARPUS. 
. T. Wightianus, Hook. et Arn. ; Benth. Fl. Hongk. 224. Happy 
Valley and West Point, Hongkong ; Lantao Island, 
Maónshan and Hahang, Hongkong ew Territory ; 
Macao; Pakhoi. Fl. yellow, June. 
— 
.S.—ASCLEPIAS. 
l. A curassavica, Linn. ; Benth. Fl. Hongk. 225. At Aberdeen, 
other villages, “Hongkong ; ; hills near 
Chaochaufu. Fl. orange-red, May to December. 
4.—GYMNEMA. 
1. G. affine, Decne. i Benth. Fl. Hongk. 227. At Little Hong- 
Kong, Hongkong; Macao; Sanning ; Pakhoi. Fl. white, 
uly. 
5.—GRAPHISTEMMA. 
. G. pietum, Benth. et Hook. f.; Holostemma pictum, Champ. ; 
Benth. Fl. Hongk. 224. In ravines of Mt. Victoria, in 
the Happy Valley and in the Pokfulam ravine, Hong- 
kong. Fl. purple and yellow, June. 
T 
6.-CYNANCHUM. 
Key to species of Graphistemma (No. 5), €, dente (No. 6), 
Tylophora (No. 8), Dregea (No. 11). 
. Inflorescence pedunculate is 
Inflorescence sessile — ... Min EM TE a 
— 
atratum. 
P" 
Leaves deeply cordate, ovate, acuminate 
Leaves narrowed, rounded or subcordate 
below wee wee eee s.. D. 
