207 



2.— GENIOSPERMUM. 



1. G. holocMlum, Hance in Journ. Bot. 1879, 13. Pakhoi. Fl. 

 , November. 



3.— MESONA. 



Key to species. 

 1. Upper calyx lip 3-toothed 



2. 



2. prunelloides. 



3. procumbens. 

 1. cJiinensis. 



Upper calyx lip entire... 

 2. Stems procumbent 

 Stems erect 



1. M. chinensis, Benth. Fl. Hongk. 274. At Chaiwan, Hongkong. 



Fl. . 



2. M. prunelloides, Hemsl. Enum. PI. China, ii. 267. Pakhoi. 



Fl. . 



3. M. procumbens, Hemsl. in Ann. Bot. ix. 155. Malautong, 



Hongkong New Territory ; foot of Phoenix Mt., Swatow. 

 Fl. pink, April. 



4.— ORTHOSIPHON. 



1. 0. sinensis, Hemsl. 1. c. 268. West River. Fl. orange- 

 coloured, Septenaber. 



5.-M0S0H0SMA. 



1. M. polystachyum, Benth. ; Hook. f. Fl. Brit. Ind. iv. 612. 

 Cape Syngmoon (Capsuimun), Hongkong New Territory. 

 Fl. flesh-coloured, . 



6.— PLEOTRANTHUS. 



Key to species. 



4. 



7. 



8. 



Leaves whorled in threes 



Leaves opposite 



Calyx teeth equal 



Calyx bilabiate ... 



Racemes simple... 



Cymes paniculate 



Leaves fleshy, cordate-rotund 



Leaves acute or acuminate 



Corolla tube straight ... 



Corolla tube abruptly deflexed 



Calyx hispid 



Calyx glabrous or pubescent 



Leaves glandular 



Leaves nearly eglandular 



Calyx erect in fruit 



Calyx declinate in fruit 



1. ternifolius. 



2. 

 4. 

 3. 



2. marmoritis. 



3. Tatei. 



4. carnosifolius. 



5. 

 6. 

 7. 



5. striatus. 



6. Gerardianus. 



7. sinensis. 



8. 



8. amethystoides. 



9. nervosus. 



