167 



APOCYNACEAE. 



Key to genera. 



1. Anthers free from stigma 



Anthers connate in cone round stigma 



2. Ovary entire 

 Ovary bipartite 



3. Leaves alternate, crowded 

 Leaves opposite 



4. Leaves mostly in verticels of 3-4 

 Leaves opposite, obtuse 



5. Leaves acuminate 

 Leaves obtuse ... 



6. Throat of corolla with scales ... 

 Corolla throat without distinct scales 



7. Anthers more or less exserted 

 Anthers included 



8. Ovary hidden in the disk 

 Ovary exserted... 



9. Corolla lobes linear 



CoroUa lobes short, ovate 



10. Anthers exserted ; leaves pubescent ... 

 Anthers included 



11. Corolla lobes long-tailed 

 CoroUa lobes not tailed 



12. Corolla lobes straight-tipped ... 

 Corolla lobes with tip deflected 



2. 



6. 



1. Melodinns. 



3. 



4. Cerbera. 



4. 

 5. 



5. Vinca. 



2. Ramoolfia. 



3. Alyxia. 



10. 

 7. 



6. Pottsia. 



8. 



12. 



9. 



13. Truchelosper- 



mum. 



10. Ecdysanthera. 



7 . Wrightia. 



11. 

 9. Strophanthus. 



8. Nerium. 



12. Anodendrvn. 



11. Ichnocarpus. 



1.— MELODINUS. 



Key to species. 



1. Scales of corolla exceedingly short, - 



sepals, at least outer ones, acute ... 1. fusiformis. 

 Scales of coroUa 1-1^ lines long, sepals 



very obtuse... ... ... ... 2. 



2. Scales of corolla free, lobes longer than 



broad ... ... ... ... 2. monogynus. 



Scales of corolla united to middle, lobes 



broader than long ... ... ... 3. suaveolens. 



1. M. fusiformis, Champ. ; Benth. Fl. Hongk. 218. Victoria 



Peak and Mt. Parker north, Hongkong ; islet in 

 Wongnaichau Bay, Hongkong New Territory ; hill near 

 Chaochaufu. Fl. white. May. 



2. M. monogynus, Roxb. ; Benth. 1. c. 218. Happy Valley and 



Mt. Parker north, Hongkong. Fl. white, May. 



3. M. suaveolens, Champ. ; Benth. 1. c. 218. Mt. Victoria, 



Mt. Parker north, Happy Valley woods and Mt. Cameron, 

 Hongkong ; Lantao Island, Kowloon City Gap and near 

 Shatin, Hongkong New Territory. Fl. white, May. 



