Euphorbia. } CXXII. EUPHORBIACE® (BROWN). 601 
not jointed to the stem, terete, marked with small alternate leaf-scars. 
Leaves not seen, doubtiess rudimentary. Flowers and fruit not seen. 
—k. Tirucalli, Hiern in Cat. Afr. Pl. Welw. i. 949, partly, not of 
Linn. 
Lower Guinea. Angola: Mossamedes; on the red-sand rocks close to the 
Rio de Sal at the base of the Serra de Montes Negros, in trout of Boca de Rio Bero, 
Welwitsch, 633! 
The dwarf habit and absence of constrictions or indication of articulation at the 
junction of the branches with the stem at onee distinguish this from EB. rhip- 
saloides, Welw., with which Hiern united it. 
192. E. Cactus, Schweinf. in Bull. Herb. Boiss. vii. App. ii. 821, 
partly (? of Ekrenb. ex Boiss. in DC. Prodr, xv. ii. 82). Stems numerous, 
branching from the base or densely tufted, 44-6 ft. high (Courbon) or 
up to 10 ft. high (Zerracciano), succulent, sometimes as thick as the 
arin, 3-4~ (rarely 5-) angled (Courbon), subcylindric at the base, then 
4-angled and only becoming 3-angled at the apex (Zerracciano), with 
the faces slightly concave or slightly convex and always continuous 
(1.¢., probably not interrupted at the constrictions of the branch) and 
the angles irregularly sinuate or lobed. Spines longer than those of 
E. canariensis, yellowish or blackish-red, becoming whitish with age 
(Courbon).—Terracciano in Ann. Istit. Bot. Roma, v.98 ; Pax in Engl. 
Jahrb, Xxxiv. 76, partly. . virosa, Courbon in Ann. Sc. Nat. 4me 
ser. xvili. 148, not of Willdenow. 
Nile Land. Eritrea: Abd-el-Kader Peninsula, Schweinfurth & Riva, 229! 
Mkullo, near Massowa, Sch weinfurth, 1762. Dessi Island, in Annesley Bay, Courbon. 
Midir Island, in Hamfila Bay, Terracciano. 
_Of this plant I have only seena flowerless scrap of Schweinfurth § Riva's 229, 
quite insufficient for either description or comparison with the Arabian £. Cactus, 
Ehrenb., with which it has been identified, The identification may be correct, but 
until good flowering specimens of both the Arabian and African plants are procured 
and compared (for ull I have seen are very scrappy) and their identity confirmed, 
the determination of the plant fiom Eritrea must remain doubtful, since many of 
these sneculent species are very similar in general appearance, but quite distinct in 
floral structure, especially as to the calyx, ovary, and styles of the female flower. 
193. E. conformis, V. Z. Br. Apparently a dwarf succulent 
leafless and spineless plant. Stems or branches repeatedly forked, 
terete, jointed, glabrous, glaucous, rigid and fragile ; branchlets widely 
diverging. Flowers unknown.—Z. viminalis, Hiern in Cat. Afr. Pl. 
Welw. i. 944, not of Burm. f. 
Lower Guinea. Angola: Mossamedes; on the inner slopes of tne Serra de 
Montes Negros, rare, Welwitsch, 631! 
194. EB. Pleckii, Pax in Bull. Herb. Boiss. vi. 738. A leafless 
bush, dichotomously branched. Branches up to 2} lin. thick, terete, 
Heshy, jointed. Involucres at the apex of the branches, about 2} lin. 
‘n diam., glabrous, with transversely ovate (oblong or elliptic ?) glands. 
Bracts scale-like, ovate, acute. 
Lower Guinea. German South-west Africa: near the River Kuisib, hanging 
like cords from the rocks, Fleck, 448A, 459A, 466A. 
