174 



3.— BUDDLEIA. 



Key to species. 



Corolla tube 1-2 lines long 

 Corolla tube 6 lines long 



1. asiatica. 



2. Lmdleyana. 



1. B. asiatica, Lour. ; Benth. Fl. Hongk. 231. Hongkong 



without locality ; Lienchow River ; North River ; West 

 River ; Wongyu ; Lofoushan. Fl. white, February. 



2. B. Lindleyana, Fortune; Benth. I.e. 231. Ravines south of 



Victoria Peak and in ravine near Wanchai Crap, Hong- 

 kong ; Lienchow River ; North River. Fl. purple, 

 August — December. 



4.— STRYOHNOS. 



Key to species. 



Flowers 4-merous 

 Flowers 5-merous 



1. paniculata. 



2. angustiflora. 



S. paniculata. Champ. ; Benth. Fl. Hongk. 232. In the 

 Happy Valley woods, Mt. Nicholson and elsewhere, 

 Hongkong ; Hongkong New Territory without locality ; 

 Canton. Fl. white, May. 



S. angustiflora, Benth. 1. c. 232. Common in the island, 

 Hongkong ; Lamma Island, Kanghau and Hahang, Hong- 

 kong New Territory. Fl. white. May. 



5.-GAERTISrERA. 



1. G. hongkongensis, Seem. : Benth. Fl. Hongk. 232. 

 without locality. Fl. . 



Hongkong 



GENTIANACEAE. 



Key to genera. 



1. Floating water plant ... 

 Terrestrial plant 



2. Climber 

 Stem erect 



3. Corolla rotate ... 



Corolla tubular, campanulate ... 



4. Corolla five times length of calyx 

 Corolla and calyx equal 



5. Limnanthemum. 

 2. 



2. Crairfui'dia. 



3.' 

 4. 



3. Gcniiana. 

 1. Exacnm. 



4. Su'crtiu. 



1.— EXACUM. 



1. E. tetragonum, Roxh. ; Benth. Fl. Hongk. 233. On top of 

 Mts. Victoria, Gough and Parker, Hongkong ; Yintak, 

 N. River. Fl. purple, September. 



