100 



4. S. Alfredi, Hance in Journ. Bot. 1870, 7. Hill near Chao- 



cliaii:^u ; North Eiver ; Lienchow River ; Soongkong 

 Island, Canton Eiver. Fl. yellow, April. 



5. S. drymarioides, Hance in Journ. Bot. 1865, 379. North 



Kiver, Fl. white, AprU. 



4.— PENTHORUM. 



1. P. sedoides, Linn.; DC. Prodr. iii. 414. In soft mud on the 

 sides of the creeks. Canton ; North River. Fl. white, 

 August. 



DROSERACEAE. 



1.— DROSERA. 



Key to species. 



1. Leaves linear, tapering ... ... 1. indica. 



Leaves small, obtuse ... ... ... 2. 



2. Stem leafy 2. peltata. 



Leaves radical ... ... ... ... 3. 



3. Leaves broad, short, short-petioled ... 3. Burmanni. 

 Leaves cuneate, long-petioled... ... 4. Loureiri. 



1. D. indica, Linn. ; Clarke in Hook. f. Fl. Brit. Ind. ii. 424. 



At Autau, Hongkong New Territory ; Swatow ; Pakhoi. 

 Fl. purple, February. 



2. D. peltata, Sm. ; Clarke 1. c. 424. Abundant on some of the 



slopes of the White Cloud hills. Fl. white, April. 



3. D. Burmanni, Vahl ; Benth. Fl. Hongk. 129. Not uncommon 



in Hongkong growing with the next species ; Swatow ; 

 Pakhoi. Fl. white, May. 



4. D. Loureiri, Hook, et Am. ; Benth. 1. c. 1 30. Abundant in 



swampy ground, Hongkong ; Lantao Island, Hongkong 

 New Territory ; Hoifung. Fl. pink, April. 



HAMAMELIDACEAE. 

 Key to genera. 



1. Petals long, coloured 



Petals squamiform or none 



2. Flowers in stalked globular heads 

 Flowers not in globular heads 



3. Flowers in involucrate heads ... 

 Flowers in short racemes or naked 



heads 



4. Flowers enclosed 



receptacles ... 

 Flowers free 



5. Styles subulate ... 

 Styles expanded above 



6. Leaves palmatilobed ., 

 Leaves without lobes . 



in bottle - shaped 



2. 

 4. 

 5. 



3. 



5. Ehodoleia. 



3. Loropetalum. 



2. Sycopsis. 



5. 

 1. Distylium. 



4. Eustigma. 



7. Liquidambar. 



6. Altingia. 



