592 (jxxii. EUi'uoKUiALE.E (bkown). [Euphorbitt. 



174. E. tenebrosa, iV. E. Br, Arborescent, 20-30 ft. high, spiny, 

 with or without small foliage-leaves. Branches erect, subparallel, 

 probably forming an obeonic crown, fleshy, usually 4- (sometimes fj-) 

 angled, constricted into subparallel-sided segments 6-15 in. long, 2-4 j 

 in. square, dark sap-green, without any bluish or glaucous tint on the 

 young parts ; angles wing-like, \-\ in. thick at the edge, straight or 

 wavy, with distinctly crenate-dentate margins and marked on the sides 

 with very prominent oblique ribs ascending from the centre to the 

 bpine-shields, when young separated by broad triangular channels 1-1 J 

 in. deep, with age growing out into fiat faces. Leaves sometimes 

 rudimentary and scale-like, l|-2 lin. long, broadly deltoid, acute; 

 sometimes growing out into cuneate-obovate or more or less spathulate 

 foliage-leaves |-li in. (or more ?) long, J-f in. broad at the top, obtuse to 

 emarginate with an apiculus in the notch at the apex, tapering to a 

 sessile base, acutely keeled on the midrib beneath, glabrous on both 

 sides, deciduous, with small persistent rigidly horny dark brown auricle- 

 like stipules at their base. Spines 1-2 lin. long, in pairs }-lJ in. 

 apart, diverging, slightly deflexed, very dark brown, on small, some- 

 what obcordate horny shields 2 lin. long, 2\-^ lin. broad, blackish- 

 brown, with the leaf-scar paler. Flo^vering-eyes sunk in the depressions 

 between the teeth 2-3 lin. above the spine-shields and quite separate 

 from them, surrounded or covered by minute blackish-brown scales. 

 Flowers and fruit not seen. 



Tropical Africa. Country unknown. Described from a livincr plant lonjj 

 cultivated rtt Kow ! 



Tills is another of the plants cultivated in rrardens as E. ahyssinica. 



175. E. confertiflora, Volkens in Xotizhl. Koniyl. But. Gart. 

 Berlin^ ii. 2G(). A leafless spiny succulent bush up to 3 ft. high. 

 Branches 4-angled ; angles wing-like, | in. broad, cuneate in transverse 

 section. Spines 2J lin. long, in pairs about 5 lin. apart, diverging, on- 

 shields which taper to an acute point below. Involucres 3 together, 

 crowded, sessile, about ^ in. in diam., shortly and broadly funnel- 

 shaped, with 5 glands and 5 fringed lobes; glands contiguous, about 

 li lin. in their greater diam., transversely oblong, with slightly deflexed 

 ends, punctate. Ovary sessile, with a minute 4-toothed cnlyx at its 

 base; style-branches forked at the upper third. — Pax in Engl. Jahrb. 

 xxxiv. 74 ; Herger, Sukk. Euphorb. (»1. 



Moramb. Blstr. German South-west Africa: Usainbaia, Hoist, 8821, 

 partly, ex I'olkeus. 



170. E. disclusa, N, ?J. Br. Arborescent, 15-30 (or more ?) ft. 

 high, leafless, spiny. Branches erect, subpn-allel, probably forming an 

 obeonic crown, fleshy, usually 4- (sometimes 5-) angled, constricted into 

 tilightly conical or nearly parallel-sided segments (i-lo in. long, 2-4 in. 

 square, thicker with age, light and somewhat bluish-green on the 

 young parts; angles wing-like, \-\ in. thick at the edge, straight or 

 wavy, with even or very faintly sinuate-toothed margins, when young 

 sopirntcd by }>road triau'jnlar chnnnpls |-1 J in. deep, with age growing 



