230 



2.— HENSLOWIA. 

 Key to species. 



Female flowers sessile ... 

 Female flowers pedicellate 



1. sessilijlora. 



2. frutescens. 



1. H. sessiliflora, Hemsl. Enimi. PI. China, ii. 409. Pakhoi. Fl. — . 



2. H. frutescens, Champ. ; Benth. Fl. Hougk. 299. Common on 



the hills in Hongkong ; Lantao Island and Taimoshan, 

 Hongkong iSTew Territory ; Swatow district ; upper parts 

 of the White Cloud hills, Canton. Fl. green, February. 



BALANOPHORACEAE. 



1 .— BALANOPHORA. 



1. B. Harlandi, Hook. f. ; Benth. Fl. Hongk. 140. INIt. Gough, 



Mt. Nicholson and Taitam Tuk, Hongkong. Fl. , 



Xorember. 



1. 



EUPHORBIACEAE. 



Key to genera. 



Male and female flowers together within 

 bracts or receptacles ; plant with 

 rmlky juice .. . 



Male and female flowers not clustered 

 together : plant with watery juice 



2. Flowers in terminal or axillary racemes, 



male above, female at base 

 Flowers not in bisexual racemes 



3. Flowers in corymbs ; leaves pabnately 



veined 

 Flowers not corymbose 



4. Leaves trifoliate, pabnately lobed or 



opposite 

 Leaves simple, alternate, not palmately 

 lobed 



5. Male and female inflorescences distinct 



but on the same branch ... 

 Flowers dioecious 



6. Female flowers in contracted racemes 

 Female flowers single or umbellate ... 

 Female inflorescence of 1 flower 

 Female flowers in an umbel ... 

 Male flowers in racemes, panicles 



catkins 

 Male flowers axillary ... 

 9. Stems herbaceous 

 Stems woody 

 10. Styles divided ... 

 Styles undivided 



7. 



8. 



or 



1. Euphorbia. 

 2. 



9. 

 3. 



14. 



4. 



15. 



