Euphorbia.] cxxii. euphorbiace.e (brown). 493 



Spine-shields bearing 4 unequal spines or 

 2 spines and a pair of mere prickles. 

 Lower pair of spines 3-10 lin. long. 

 Branches cylindric or subcylindric 

 with about 6 spiral series of spine- 



sliields 143. E. ELlenheckii. 



Branches 4-angled. 



Upper pair of spines 2-6 lin. long; 

 stem -angles not very promi- 

 nently toothed .... 13(3. E.tetracantha. 



Upper pair of spines \-2, lin. long; 



stem - angles prominently 



toothed. 



Horny margins of the teeth more 



or less prolonged beyond the 



tooth into ii sort of neck 



supporting the spines. 



Spines shorter than the neck 



supporting them . . 123. E.f areata. 



Spines longer than the neck 



supporting them . .124. E. uhliglana. 



Horny margins of the teeth not 



prolonged beyond the toofh j 125. E. Sehinzii. 

 Lower pair of spines ^-3^ lin. long, upper 

 pair J-1 lin. long or almost obsolete. 

 Dried stems slender, Ii-2 lin. thick, 



more or less twisted . . . 126. E. forla. 



Dried stems 3-5 lin. thick. 



Spine-shields bright chestnut- 

 brown ; larger spines 2-3i lin. 

 long ....". 127. E. angustifiora. 



Spine-shields grey ; larger spines 

 1-2 lin. long. 

 Smaller pair of spines or prickles 



hooked, recurved . . . 128. E. tetracanthoides. 



Smaller pair of spines or prickles 



straight,ascending or spreading 129. E. coenclans. 

 Spine-shields bearing only 2 spines, rarely 

 also with a pair of very rudimentary 

 prickles or minute points, one on each 

 sid^ of the leaf-scar. 

 Spines often very unequal on the same 

 stem, with tlie larger 4—9 lin, long. 

 Branches (dried) ^-^ in. thick, cylin- 

 dric, with many series of grey spine- 

 shields ; spines slender, needle-like, 

 grey . . . . . . 141. ^. inccquispina. 



Branches (livingj f-1^ in. thick, 

 9-angled ; spine-sliields and the 



rather stout spines chestnut-brown. 146. E. PhillipsicE. 

 Spines subequal, 1-4 lin. long; dried 

 branches ^-^ in. thick. 

 Branches obscurely 4-angled or perhaps 

 subcylindric; spine-shields in oppo- 

 site pairs ..... 130. E. tortlstyla. 



