178 



CONVOLVULACEAE. 



Key to genera. 



Leafless parasite 



Stem leafly 



Prostrate creeping herb with reniform 



leaves and minute flowers... 

 Erect or climbing plant or with large 



flowers 

 Flowers in long racemes 

 Flowers in axillary cymes or solitary... 



9. 



Cuscuta. 

 2. 



8. Dichondra. 



3. 

 7. For ana. 

 4. Ipomoea, etc. 



1.— ERYCIBE. 



1. E. obtusifolia, Benth. Fl. Hongk. 236. Mt. Victoria and 

 Mt. Parker south, Hongkong. Fl. white, June. 



3.— ARGYREIA. 



1. A. speciosa, Sweet ; Hook. f. Fl. Brit. Ind.iv. 185. Naturalised, 

 Hongkong. Fl. . 



3.— LETTSOMIA. 



For key to species see Ipomoea. 



1. L. Chalmersii, Hance in Journ. Bot. 1878, 230. Sanning ; 



Tingushan, near Chaokingfu, West Kiver. Fl. white, 

 September. 



2. L. Championi, Benth. et Hook.f. ; Argyreia Championi, Benth. 



Fl. Hongk. 236. North side of Victoria Peak, Hongkong ; 

 Swatow ; Macao ; Lofoushan. Fl. , September. 



0. L. strigosa, Roxb. ; Clarke in Hook. f. Fl. Brit. Ind. iv. 193, 



Castle Peak, Hongkong New Territory. Fl. purple, 

 October. 



4.— IPOMOEA. 



Key to species of Erycihe (No. 1), Aryyreia (No. 2), Lettsomio 

 (No. 3), Ipomoea (No. 4), Convolvulus (So. 6), and Evolndus 

 (No. 7). 



1. Leaves entire 

 Leaves lobed or compound 



2. Bracts boatshaped, persistent 

 Bracts leaflike, small or none 



3. Water plant 

 Climber 



4. Leaves narrowed into the petioles 

 Leaves sagittate or cordate 



5. Leaves shining white beneath ... 

 Leaves glabrous or grey pubescent 



6. Leaves pubescent beneath 

 Leaves glabrous ... 



7. Leaves sagittate ... 

 Leaves cordate ,,, 13, 



2. 



20. 



1. /. pileata. 



3. 



2. /. aquatica. 



4. 

 30. 



7. 

 Lettsomia Chalmersii. 



6. 

 Lettsomia Championi. 

 Erycihe obtusifolia. 



