Euphorbia. | CXXII. EUPHORBIACEH (BROWN). 581 
angled, constricted at intervals into oblong or suborbicular joints 
3-1} in. long and }-1} in. in diam., glabrous; angles compressed, faintly 
or deeply smuate-toothed according to vigour, with continuous horny 
dark brown or grey borders connecting the spine-pairs; teeth (when 
prominent) up tu 2 lin. long, 14-4 lin. apart ; spines diverging, 3-4 lin, 
long, with or without a pair of minute straight prickles at their base, 
dark brown, becoming grey. Cymes solitary in the axils of the teeth, 
sessile, with 1-3 involucres. Bracts suborbicular, about 1} lin. in diam. 
Involucres sessile, 2~24 lin. in diam., broadly and shallowly obconic, 
glabrous, with 5 glands and 5 transversely oblong or subquadrate fringed 
lobes; glands 3-1 lin. in their greater diam., transversely oblong, entire, 
2-lipped, in dried flowers often appearing very narrow (transversely) with 
the lips folded together, yellow. Ovary sessile and together with the 
united part of the styles included in the involucre, glabrous; styles 
nearly 1} lin. long, united at the basal third, with recurved-spreading 
arms, bifid at the apex. Capsule sessile and its base included in the 
involucre, only seen in an immature state.—Z. polyacantha, Hiern in 
Cat. Afr. Pl. Welw. i. 946, not of Boiss. 
Lower Guinea. Angola: Huilla; Dekindt, 1030! in elevated rocky places 
between Lopollo aud Nene, 500 tt., Welwitsch, 640! Pungo Andongo; frequent on 
rocks throughout the Presidium, Welwitsch, 639 ! 
: Welwitsch has noted on his label with 639 that the plant is “1-14 ft. high,” but 
NS specimens do not show those proportions, being only about 6 in. high, and appear 
to me to be conspecific with his 640. 
Pax in Engl. Jahrb. xxxiv. 375 has considered this plant to be Z. heteracantha, 
Pax, but that species is identical with #, swbsa/sa, Hiein, and quite distinct from 
E. fraterna. 
Toa, E. Thi, Schweinf. in Verhandl. Zool.-Bot. Geselisch, Wien, 
Xvill. 660. A succulent leafless spiny bush 2-4 ft. high, branching 
from the base, glabrous in all parts. Branches erect, 3-1? in. (or more ¢) 
in diam., 4—6-angled, constricted at intervals of 3-24 in. ; angles com- 
Pressed, more or less lobed by the stem-constrictions, with continuous 
horny dark grey margins. Spines very unequal on the same stem, stout, 
Some 2-3 lin. long, others 4-9 lin. long, in pairs 2-6 lin. apart, straight, 
diverging, dark grey. Cymes solitary in the axils of the spines, sub- 
Sessile, with 3 involucres. Bracts 3-1 lin. long, broadly ovate, obtuse. 
Tavolucres about 2 lin. in diam., cup-shaped, with 5 glands and 5 
broadly cuneate fringed lobes; glands about lin. in their greater diam., 
transversely oblong, entire. Ovary oblong-trigonous, much longer than 
road, with a very short pedicel; styles about 1? lin. long, united for 
almost half their length, with recurved-spreading arms bifid at the apex, 
the ovary and half of the united part of the style included in the 
involucre, Capsule, with the exception of its base, exserted, 14 Jin. in 
diam., globose-trigonous. Seeds ? lin. long, ellipsoid, with the inner 
face obscurely angular and marked with a brown median line, minutely 
‘crobiculate-tuberculate, brown.—Pax in Engl. Jahrb, xxxiv. 77, partly ; 
Berger, Sukk. Euphorb. 63. 
Y Nile Land. Nubia: between Suakin and Berber; in Wady Haratreb, 
: chweinfurth, 832! and at Singat, Schweinfurth, 211! 
