Luphorbia. | CXXII. EUPHORBIACEE (BROWN). 
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- 
shields 3 : : - . 
Branches 4-angled. 
Upper pair of spines 2-6 lin. long; 
stem-angles not very promi- 
nently toothed . c . 
Upper pair of spines 4-2 lin. Tong 
stem - angles er onuiently 
toothed. 
Horny margins of the teeth more 
or less prolonged beyond the 
tooth into a sort of neck 
supporting the spines. 
Spines shorter than the neck 
supporting them : . 
Spines longer than the neck 
supporting them 
Horny margins of the teeth not 
prolonged beyond the tooth ; 
Lower pair of spines 3-33 lin. long, upper 
pair 3-1 lin. long or almost obsolete. 
Dried stems slender, 13-2 lin. thick, 
more or less twisted 
Dried stems 3-5 lin. thick. 
Spine-shields bright chestnut- 
brown; larger ee 2-33 lin. 
long . . 
Spine-shields grey; lar ger spines 
1-2 lin. long. 
Smaller pair of spines or prickles 
hooked, recurved . 
Smaller pair of spines or prickles 
straight,ascending or spreading 
Spine-shields bearing only 2 spines, rarely 
also with a pair of very rudimentary 
prickles or minute points, one on each 
side of the leaf-scar. 
Spines often very unequal on the same 
stem, with the rags 4-9 lin. long. 
Branches (dried) 3—3 in. thick, cylin- 
dric, with many series of grey spine- 
shields ; spines slender, needle-like, 
grey. : : : c 
Branches (living) $-1} in. thick, 
9-angled ; spine- -shields and the 
rather stout spines chestnut-brown. 
Spines subequal, 1-4 lin. long; dried 
branches 3-4 in. thick. 
Branches obscurely 4-angled or perhaps 
subcylindric ; spine-shields in oppo- 
site pairs . : . . 
143. EB. Ellenbeckit. 
136. £. tetracantha. 
123. E. fureata. 
. 124. £. uhligiana. 
125. E. Schinzit. 
. 126. #. torta. 
127. E. angustiflora. 
129. E. cerulans. 
44. EB. inequispina. 
146. E£. Phillipsie. 
. 130, £. tortistyla, 
493 
. 128. EB. tetracanthoides. 
