138 



44. Flowers white or purple 



Flowers yellow 



45. Involucral bracts in single row ... 

 Involucral bracts imbricated 



46. Ray florets about 8 



Ray florets very numerous 



47. Scapose perennial 



Small prostrate annual ... 



48. Achenes beaked 



Achenes not beaked 



49. Leaves cauline 

 Leaves radical 



50. Involucral bracts imbricate in 



many rows 

 Involucral bracts in a single row 

 with a few small outer bracts 



5L 



52. 



53. 



Leaves cauline 

 Leaves radical 

 Pappus scaly 

 Pappus setose 

 Pappus wanting 

 Pappus present 



11, Aster (p. 140). 



45. 

 39. Senecio (p. 148). 



46. 

 6. Solidago (p. 140). 

 22. Inula (p. 144). 



44. Gerbera (p. 149). 

 36. Soliva (p. 146). 



49. 

 50. 



48. Lactuca (p. 150). 



45. Taraxacum (p. 149). 



51. 



53. 



49. Sonchus (p. 150). 



50. Launaea (p. 151). 

 4. Ageratum (p. 139). 

 1. Vernonia (p. 138). 



45. Lapsana (p. 149). 



46. Crepis (p. 150). 



1.— VERNONIA. 



Key to species. 



1. Involucral bracts acute ... 

 Involucral bracts oblong, obtuse 



2. Achenes glabrous 

 Achenes hairy 



3. Heads scattered 



Heads in a terminal corymb ... 



4. Heads on short lateral branches 

 Heads in a terminal corymb ... 



5. Involucral bracts wooUy aU over 

 Involucral bracts wooUy on margins 



only , 



1. 

 2. 

 3. 

 4. 

 5. 



2. 



5. 

 3. 

 4. 



chinensis. 



saligna. 



Clivorum. 



cinerea. 



solanifolia. 



6. Andersoni. 



1. V. chinensis, Less. ; Benth. Fl. Hongk. 169. Common in 



waste places, Hongkong ; Lantao Island, Hongkong New 

 Territory ; on the river bank near Chaochaufu ; Canton ; 

 Lofoushan. Fl. purple, April-October. 



2. V. saligna, D C. ; Hook, f . Fl. Brit. Ind. iii. 235. On the south 



side of Mt. Parker, Hongkong ; Lantao Island, Hongkong 

 N ew Territory ; Lofoushan, 1000 ft. Fl. white, October, 



3. V. Clivorum, Hance in Journ. Bot. 1869, 164. At Shiuhing 



on the West River. Fl. purple, February-October. 



4. V. cinerea, Less. ; Benth. Fl. Hongk. 169. A common weed in 



Hongkong ; at Lokloha, Hongkong New Territory ; ir 

 fields near Chaochaufu. Fl. purple, all the year. 



5. V. solanifolia, Benth. 1. c. 169. Frequent in Hongkong ; 



Taimoshan at 1500 ft., Hongkong New Territory ; hill 

 near Chaochaufu. Fl. light purple, February. 



