Euphorbia. | CXXII, EUPHORBIACEZ (BROWN). 565 
Ehrenb. JZ. infesta, Pax in Engl. Jahrb. xxxiv. 80. £Z. sp., Courbon 
in Ann. Se. Nat. 4me sér. xviii. 149. 
Nile Land. Nubia: Uaratab Mountain, near Suakin, Schweinfurth, 840! 
Chor Sseterra, south of Suakin, Schweinfurth, 841! Olao, Johnston, 9! Eritrea: 
Ras Gerar, Beccari ! Howakel Island, Ehrenberg! Dessi Island, Schweinfurth ! 
Courbon. Near Massowa, Schweinfurth, 87, 1781; Saati, Schweinfurth, 81 (all ex 
Schweinfurth), Somaliland: Dadab, Ellenbeck, 157! 
E. infesta, Pax, is described from a specimen preserved in fluid, which retains its 
original size and form, but is not in any way distinct from H. triaculeata. 
Var. triacantha, N. E. Br. Branches 2-24 lin. thick when dried ; spines rather 
more slender than in the type. Involucres 14 lin. indiam. Otherwise as in the type 
and apparently passing into it.—Z. triacantha, Ehrenb. ex Boiss. in DC. Prodr. xv. ii. 
85; Schweinfurth, Beitr. Fl. Aethiop. 36; Terrace. in Ann. Istit. Bot. Roma, v. 98; 
Berger, Sukk. Euphorb. 88. #. Fauroti, Franchet in Morot, Journ. de Bot. i. 135; 
Pax in Engl. Jahrb. xxxiv. 79. 
Nile Land. Eritrea: Toalut Island, Ehrenberg! various islands in Hamfila 
- Bay, Terracciano. Obcck: Dullul; on the sea-shore and in the valley, Roth! on 
rocks near Obock, Faurot. 
: In Ann. Istit. Bot. Roma, v. 98, Terracciano quotes specimens collected on the 
islands in Hamfila Bay, Eritrea, »nd Pax in vol. vi. 186, quotes specimens collected 
by Robecchi and by Riva in Somaliland, but some of these may belong to typical 
E. triaculeata ; I have not seen them. 
120, E. monacantha, Pax in Engl. Jahrb. xxxiii. 285 and xxxiv. 
63. A much-branched leafless very spiny succulent 4-8 in. high. Stems 
or branches }~4 in, thick when dried, apparently cylindric, with several 
spiral series of tubercles or several tuberculate angles, each tubercle 
beating 1 spreading grey spine 4-3 in. long, with or without a pair of 
small or minute prickles 3-1 lin. long at its base, on a more or less 
3-lobed shortly decurrent horny grey shield. Leaves very rudimentary, 
seale-like, soon deciduous. Involucres 3 together in the axils of the 
shields, sessile or on peduncles 4-3 lin. long, bearing a pair of oblong or 
ovate toothed bracts at their apex, cup-shaped, 14-1} lin. in diam., 
yellow, with 5 glands and 5 large broadly cuneate or cuneate-obovate 
fringed lobes ; glands variable, contiguous or separated, sometimes even 
on the same involucre, 3-3 lin. in their greater diam., varying from 
Subquadrate to transversely oblong, somewhat undulating, from the side 
Margins being recurved. Ovary sessile or shortly pedicellate, perhaps 
exserted in fruit, glabrous; styles about 1 lin. long, united for 4-3 their 
length, slender, with more or less thickened entire tips.-—L. triacantha, 
ax in Ann, Istit. Bot. Roma, vi. 186, not of Ehrenberg. Z. xylacantha, 
Pax in Engl. Jahrb. xxxiv. 79. 
Nile Land. Gallaland: Arussi Country, at Gorobube, Ellenbeck, 19741 
Somaliland: between Berbera and Harar without precise locality, Ruspoli F Riva, 
31! 354! and 324 ex Pax. 
Dr. Pax has founded two species upon this plant and placed them in two different 
groups, characterised by the presence or absence of the pair of small prickles at the 
e of the spine ; but as in nearly all the species having these prickles (which are 
really the stipules of the rudimentary leaves), they are sometimes well developed, 
Sometimes reduced to almost imperceptible points, there is no specific distinction. 
