Euphorbia. CXXII. EUPHORBIACE (BROWN). 573 
iy 
Partly described from living plants cultivated at Kew, which were sent from 
Uganda by Mr. E. Brown. 
E. heterochroma is placed by Pax in a group supposed to be characterised by the 
presence of 4 spines to each spine-shield, whilst 2. Stuhlmannii is placed in another 
group having only 2. But the 4 spines in this, as in all other cases, are composed of 
the usual pair of spines developed below each leaf and a pair of small prickles or 
rarely spines (really stipules) placed one on each side of the leaf-scar. These prickles 
are sometimes well developed, sometimes quite absent on the same branch, and I find 
them to be, in most cases, quite useless for distinctive purposes. EZ. heterochroma 
is a case in point, for on some parts of the specimens composing the type gathering 
the prickles are well developed, and on the other parts (even of the same branch) they 
are quite absent. They are absent from Fischer, 182, and from the type specimen 
of E, Stuhlmannii, in which the spines are reduced to mere points, but that is 
certainly specifically identical with H. heterochroma. The species is very distinct 
from all those most nearly allied to it and easily recognised by its long-exserted small 
capsule. Goetze, 463 and 465, from Uhehe, German East Africa, are also quoted 
by Pax in Engl. Jahrb. xxviii. 421, as belonging to #. Stuhlmannii. Ihave not seen 
the specimens, but as they are stated to belong to a tree 6-36 ft. high the identification 
seems doubtful, Var. mitis I believe to be merely a more or less starved condition 
of the plant. 
136, E. tetracantha, Rendle in Jowrn. Bot. 1896, 130. A dwarf 
leafless densely spiny succulent, about 6 in. high, branching from the 
base into many 4-angled stems about 24 lin. thick when dried; angles 
hot very prominently toothed, with continuous or slightly interrupted 
horny grey margins. Spines in groups of 4, of which the upper pair 
are 2-6 lin. long and the lower pair 6-10 lin. long, all needle-like, 
ascending-spreading and slightly diverging, dark grey. Flowering-eyes 
in the axils of the shorter pairs of spines. Involucres 3 together, very 
Small, sessile (really forming a sessile cyme), with minute scale-like 
bracts at their base, obconic-campanulate, about 1 lin. in diam. and 
scarcely as long, most minutely scaberulous, with 5 glands and 5 
subyuadrate shortly toothed lobes; glands 4-3 lin. in their greater 
‘umm., apparently suberect, transverse, with the outer margin much 
nfolded at the middle, so as to form a deep notch there, and the inner 
margin raised into a slight rim. Ovary (not seen) on a pedicel 4 lin. 
ong ; styles undivided (Rendle).—Pax in Engl. Jahrb. xxxiv. 375, 
Nile Land. Somaliland: Shebele, Donaldson Smith ! 
i 
137, E. subsalsa, Hiern in Cat. Afr. Pl. Welw.i.948, A succulent 
leaffess Spiny shrub, up to 4 ft. high, with numerous stems arising from 
the same base, sometimes flowering when less than 1 ft.high. Branches 
4-4 in. thick when dried, 4-angled, glabrous, light green ; angles some- 
What compressed, toothed, with interrupted or occasionally subcon- 
‘nuous horny brown or dark grey margins, from the long-decurrent 
ro pigedad Spine-shields, Spines stoutly needle-like, in double pairs, with 
¢ larger pairs 4-7 in. apart, 2-6 lin, long, divergent and the small pair 
at their base 3-2 lin. long, widely spreading, brown or dark grey. 
aves rudimentary, scale-like, minute. Involucres 3 together in the 
aa of the tubercles along the terminal part of the branches, sessile, 
ut 1} lin. in diam., cup-shaped, glabrous, with 5 glands and 5 
