EUPHORBIA 



EUPHORBIA 



1171 



in. wide, numerous, whorled, erect-spreading, making 

 a dense rounded head in older plants; sides of branches 

 almost plane; angles deeply sinuate dentate; spine pairs 

 apart, spines 3-5 lines long, slender, light 

 brown to gray: Ivs. very 

 small, triangular. S. 

 Afr. 



HH. Spine-shields united, 

 forming a continu- 

 ous horny edge to 

 the ribs. 



22. grandicornis, 

 Goebel. Fig. 1444. Shrub 

 or small tree: branches 

 3-5 in. wide, deeply 

 jointed, the angles 

 broadly winged, lobed 

 and sinuate, the edge 

 zigzag or wavy; spines 

 large, 1-2 in. long, light 

 colored : Ivs. very small, 

 triangular ovate. S. 

 Afr.(?). A fine plant, 

 with the longest spines 

 and widest wings of all. 

 A ^ rapid grower, the 

 bright pale green con- 

 trasting beautifully with 

 the rich light brown of 

 the spines and horny 

 margins on young 

 plants. 



1444. Euphorbia grandicornis. 

 (X.%) 



GG. Sides of branches marbled with white or yellow. 



23. lactea, Haw. (E. havanensis, Hort., at least in 

 part). Fig. 1445. Similar to E. antiquorum, but with 

 a white-marbled area running through the middle 

 of each face of the branches. E. Indies. One of the 

 most common succulent euphorbias in cult., of fine can- 

 delabra form, and making rapid growth. The euphor- 

 bias grown for hedges in Fla., W. Indies, etc., are chiefly 

 this species, though some may be E. antiquorum. It is 

 often confused with E. Hermentiana. Cristate forms 

 are in the trade as E. lactea monstrosa and E. havanensis 

 cristata, though these should perhaps be referred to 

 E. antiquorum. 



24. Hermentiana, Lem. Shrub, with closely erect, 

 scarcely jointed branches, about 2 in. thick; sides 

 strongly concave, striped or marbled with white, 

 especially when young, angles closely dentate; spines 

 slender, brown, 2-3 lines long: Ivs. lanceolate, ^-2J^ 

 in. long. W. Afr. G.Z. 19:101. One of the best. The 

 true E. candelabrum, Trem., but probably not the one 

 common in cult, under that name, is distinguished from 

 E. Hermentiana by its rudimentary scale-like Ivs. 



FFP. Angles of the branches 4~8 (rarely 3 on some 



branches). Class POLYGONS. 

 G. Spine-shields united, forming a continuous horny 



edge to the ribs. 



H. Sides of mature branches plane or slightly convex, 

 angles not winged, branches about 2 in. diam. 



25. Pseudocactus, Berger. St. 4-5-angled: branches 

 3-5-angled, joints tapering upward from a broad base, 

 4-6 in. long, 2 in. or less thick, the surface with yellow 

 U-shaped marks from center to angles; spines stout, 

 ^in. long, brown to gray. Nativity (?). J.H. III. 60:99 

 (as E. lactea}. Frequent in cult., often under the 

 name of E. lactea; also as E. marmorata and E. tesseUata. 



26. ccerulescens, Haw. (E. virdsa, and var. cceru- 

 lescens of Berger). Low, shrubby: st. 4-5-angled: 

 branches 3-angled at base, 4-5-angled above, 2 in. 

 thick; joints 2 in. or less long, the sides bluish glaucous; 

 spines stout, J^in. long: Ivs. triangular, scale-like. S. 

 Afr. G.Z. 19:102. A handsomely colored compactly 



branched succulent. According to N. E. Brown, E. 

 virdsa, Willd., is quite a different plant. It is probably 

 not in cult, in Amer. 



27. Echinus, Hook. & Coss. Branching shrub, with 

 6-angled st., branches ascending, about 2 in. thick, 

 5- or more-angled: spine pairs less than J^in. apart; 

 spines %in. long, red to gray. Morocco. G.Z. 1904 : 122. 



HH. Sides of mature branches concave, angles more or 

 kss winged, branches often 3-4 in. thick. 



28. triangularis, Desf. Tree-like: st. at first 6-angled, 

 later cylindrical: branches whorled, divergent, then 

 ascending, 3-5-angled, 2-4 in. thick; joints 2-12 in. 

 long; spine pairs 3-9 lines apart; spines less than 5 

 lines long; spine-shields united only on stronger snoots: 

 Ivs. small, roundish. S. Afr.(?). 



29. CoSperi, N. E. Br. Tree-like: whorled ascending 

 branches, 3-5 in. thick, the joints broad at base and 

 tapering upward, 6-angled, spines 5 lines long, black to 

 gray. Natal. A fine species. 



GG. Spine-shields separate. See also No. 28. 



H. Sides of mature branches plane or slightly convex, 



angles not winged, branches less than 2 in. thick. 



30. resinifera, Berg (E. San Salvador, Hort.). A 

 much-branched shrub: branches 4-angled, spine- 

 shields triangular-rounded, small, 3^5 lines apart. S.W. 

 Morocco. G.Z. 19:102. This species yields the euphor- 

 bium gum of the ancients. 



31: canariensis, Linn. Shrub or tree, 12-20 ft. high, 

 with many 4-6-angled, suberect, not conspicuously 

 jointed branches, as much as 3 in. thick; angles sub- 

 entire; spines 2 lines long, black: Ivs. almost none. 

 Canary Isls. Gn. 53, p. 46. This is one of the most com- 

 mon succulent euphorbias. It is easy to grow and prop, 

 readily from cuttings, as well as from seeds which are 

 frequently produced in cult. Several other species are 

 in cult, under this name. 



1445. Euphorbia lactea. No. 23. 



