276 



DIOSCOEEACEAE. 



1.— DIOSOOREA. 



Key to species. 



1. Plants armed with spines 



Plants unarmed 



2. Leaves alternate 

 Leaves opposite 



3. Capsule lobes 3 lines broad 



Capsule lobes more than 3 lines broad 



4. Leaves 3-4 inches long, 2-3 inches broad 

 Leaves imder 3 inches long and imder 



2 inches broad 



5. Leaves ovate, hastate ... 

 Leaves cordate ... 



6. Leaves sagittate or hastate at the base 

 Leaves rounded at the base . . , 



1. 



rhipogonoides. 

 2. 

 3. 

 4. 



sativa. 

 bulbifera. 

 5. 



6. 



persimilis. 

 Batatas. 

 Fordii. 

 Benthamii. 



1. D. rhipogonoides, Oliver in Hook. Ic. PI. t. 1868. Wongnei- 



chong, and on hills above the Sookunpo valley, Hong- 

 kong ; top of the Phoenix Mt., Swatow. Fl. white, April 

 to May. 



2. D. sativa, Linn. ; Benth. Fl. Hongk. 368. Aberdeen New 



Road, and Mt. Victoria, Hongkong ; Saikung Road, 

 Hongkong New Territory; Lofoushan. Fl. white, August. 



3. D. bulbifera, Linn. Sp. PI. ed. i. 1033. Kwangtung without 



locality. Fl. . 



4. D. persimilis, Prain et Burhill in Journ. As. Soc. Bang. n.s. ii. 



454. Hongkong New Territory without locality ; 



Lofoushan. Fl. , August. 



0. D. Batatas, Decne.; Benth. Fl. Hongk. 368. Conduit Road, 

 Hongkong ; Lantao Island, Hongkong New Territory ; 



Canton ; Lienchow River. Fl. , September. 



Fordii, Prain et Burkill 1. c. 450. ^Mt. Victoria, ]Mt. Gough, 



6. D. 



and North Point, Hongkong ; Lantao Island, Hongkong 



New Territory. Fl. , September. 



D. Benthamii, Prain et Burkill 1. c. 448. jSIt. Parker north, 

 Happy Valley, Little Hongkong, and Taitam, Hong- 

 kong ; Lantao Island, Hongkong New Territory. Fl. 

 white, June. 



ROXBURGHIACEAE. 



1.— STEMONA.. 



Key to species. 



Peduncles l-flowered ... ... ... 1. acuta. 



Peduncles 3-flowered ... ... ... 2. tuherosa. 



1. S. acuta, C. H. Wright in Journ. Linn. Soc. xxxii. 



Lienchow River. Fl. greenish. May. 



2. S. tuberosa, Lour. ; Hook. f. Fl. Brit. Ind. vi. 298. 



Parker north, Hongkong. Fl. greenish, January ? 



493. 

 Mt. 



