Euphorbia. | CXXII. EUPHORBIACE# (BROWN). 597 
Probably Schweinfurth 816 from Keren belongs here, but I have only seen 
2 transverse stem-sections, each with 5 angles ; they have the characteristic thick 
central part of this species. I also think that E. abyssinica, var. tetragona, 
Schweinf. in Bull. Herb. Boiss. vii. App. ii. 819, and Berger, Sukk. Euphorb. 69, 
may be a variety of this plant. It was collected in Eritrea on the High Plateau of 
Haigett, Schweinfurth, 1351 of his 1891 (not 1892) collection, but I have only seen 
9 transverse stem-sections, 2 with 3 angles and 7 with 4 angles. Berger states that 
his var. Hrythree is at first 3-angled, becoming 4-angled, but the branch of the type 
which he obligingly communicated to Kew has 5 angles and is absolutely identical 
with Schweinfurth, 226. It is one of the plants that have been in cultivation for 
many years under the name of Z. abyssinica. The relatively thick solid central part 
in proportion to the breadth of the angles of the stem at once distinguishes 
E. Erythree from E. acrurensis and EB. diselusa. 
183. E. calycina, V. #. Br. A succulent spiny leafless tree 30 ft. 
high, Branches 13-34 in. in diam., very slightly constricted at intervals 
of 5-7 in. or more, 4-angled, with a small central solid part 1-2 in. in 
diam., glabrous. Angles much compressed, wing-like, 2~3 times as broad as 
the central part is thick, with nearly even or but faintly sinuate margins. 
Leaves scale-like. Spines 3-2 lin. long, sometimes obsolete, in pairs 4—} 
in. apart, subparallel or not very divergent, brown, on oblong or sub- 
orbicular horny brown shields, which are not decurrent nor connected 
by a horny border along the angles. Flowering-eyes united with or 
embraced by the shields. Cymes on peduncles $~-? in. long, bearing a 
central sessile male involucre and 2 lateral mostly hermaphrodite 
involucres on short branches 13-23 lin. long, glabrous. Bracts about 
2 lin. long, suborbicular, concave, thin. Involucres 3-3} lin. in diam. 
and 1} lin. deep, shallowly and broadly cup-shaped, glabrous, with 5 
glands and 5 broad transverse fringed lobes; glands subcontiguous, 
13-12 lin. in their greater diam., transverse, reniform, two-lipped, with 
the ends decurved, and (in the dried specimens seen) undulated on the 
margins, entire. Ovary or young fruit exserted just beyond the stamens, 
on a pedicel as long as the involucre, trigonous-globose, glabrous, with 
4 Conspicuous calyx at its base cut into 6-9 or more linear or filiform 
*egments 1-1} lin. long; styles 3, about 1-1} lin. long, shortly united 
at the base, strongly recurved, rather slender, thickened or minutely 
2-lobed at the apex. Capsule and seeds not seen.—#. Candelabrum, 
Pax in Engl. Jahrb. xxxiv. 76, not of Trém. 
Nile Land. Soudan: Meshra el Rek, by the Ghazal River, Schweinfurth, 
1259! Mittu: near Legbi, Schweinfurth, 2824 ! 
The very small central portion of the branches at once distinguishes this from 
&. Candelabrum, Trém. 
184. E. Barteri, V. £. Br. Acandelabrum-like tree, 20 ft. high, 
leafless, spiny. Branches probably 4-angled ; the only specimen seen 
consists of a piece 1 ft. long, with 2 angles, constricted into 5 narrowly 
elliptic joints 1}-3$ in. long and 3-13 in. broad, glabrous; angles wing- 
'ke, With even (not at all sinuate-toothed) margins. Spines 1-2 lin. long, 
n pairs 4-4 in. apart, sometimes with another pair of minute or rudi- 
mentary spies or points 3-3 lin. above them, diverging, dark brown, on 
horny brown orbicular shields, 1-1} lin. in diam., becoming grey with age. 
i 
