93 



I.— PRUNUS. 



Key to species. 



1 . Peduncles solitary oir fascicled ... 5. 

 Flowers racemose ... ... ... 2. 



2. Leaves entire ... ... ... ... 3. 



Leaves toothed ... ... ... 3. macrophylla. 



3. Leaves punctate ... ... ... 4. 



Leaves without dots beneath ... ... i. marginata. 



4. Veins obscure ... ... ... ... 5. Fordiana. 



Veins prominent ... ... ... 6. punctata, 



5. Stone of fruit rough and downy ... 1. Mume. 

 Stone of fruit smooth ... ... ... 2. japonica. 



1. P. Mume, Sieb. et Zucc. in Fl. Jap. i. 29. Cultivated in 



Hongkong New Territory and Kwangtung. Fl. white, 

 J anuary. 



2. P. japonica, Thunb. ; Cera sus japonica, Loisel. ; DC. Prodr. 



ii. 538. On Victoria Peak, Peak Koad and Bowen 

 Road, Hongkong ; Taimoshan, Hongkong New Territory. 

 Fl. white, February. 



3. P. macrophylla, Sieb. et Zucc. ; Pygeum oxycarpum, Hance in 



Journ. Bot. 1870, 242. White Cloud hills and Lienchow 

 River. Fl. , November. 



4. P. marginata, Dunn in Journ. Bot. 1907, 402. Lantao Peak 



at 1500 ft., Hongkong New Territory. Fl. white. May. 



5. P. Fordiana, Dunn 1. c. 402. Sanning. Fl. . 



6. P. punctata, Hook. f. Fl. Brit. Ind. ii. 317. In the Happy 



Valley woods, Mt. Parker north. Cape d'Aguilar, Hong- 

 kong ; in a wood at the White Cloud monastery, Canton. 

 Fl. white, April, 



I. P. latifolium, My. ; 

 without locality. 



2.— PYGEUM. 



; Benth. Fl. Hongk. 

 Fl. white, . 



104. Hongkong 



3.— SPIRAEA. 



Key to species. 



1. Leaves obtuse, toothed at top ... 1, Blumei. 

 Leaves elliptic or lanceolate, acute ... 2. 



2. Leaves nearly entire ... ... ... 2. prunifolia. 



Leaves inciso-serrate ... ... ... 3. cantoniensis. 



1. S. Blumei, G.Don; Maxim, in Act. Hort. Petrop. vi. 19&. 



- Swatow ; Lienchow River. Fl. white, April. 



2. S. prunifolia, Sieb. et Zucc. ; Maxim. 1. c. 184. On hill at 



Chaochaufu. Fl. white, April. 



3. S. cantoniensis, Lour. ; Benth. Fl. Hongk. 105, Hongkong 



without locality ; Whampoa, Fl, vhite, April. 



