EUPHORBIA 



EUPHORBIA 



1169 



piscatoria, 54. 

 plenissima, 8. 

 Poinsettiana, 8. 

 poly chroma, 57. 

 polygona, 41. 

 Fseudocactus, 25. 

 pteroneura, 14. 

 pulcherrima, 8. 

 Kegis-Jubae, 54. 



INDEX, CONTINUED 



resinifera, 30. 

 rhipsaloides, 11. 

 robusta, 64. 

 sanguinea, 2. 

 San Salvador, 30. 

 serpentaria, 49. 

 similis, 33. 

 spinosior, 42. 

 splendens, 15. 



submammillaris, 43. 

 tessellata, 25. 

 Tirucallii, 10. 

 triarigularis, 28. 

 cariegata, 1. 

 viperina, 49. 

 virosa, 26. 

 Wulfenii, 61. 

 xylophylloides, 12. 



A. Glands of the involucre with petal-like appendages 

 (almost none in 4) ' slender-branched herbs or rarely 

 shrubs not spiny: Ivs. entire. Section ADENO- 

 PETALUM. The Section ANISOPHYLLUM, genus 

 Chamxsyce of some, differs in having small oppo- 

 site Ivs., unequal at base, stipules present, fls. 

 email, glands 4. It contains most of the low herba- 

 ceous wild euphorbias of U. S., such as E. mac- 

 ulata, Linn., E. Preslii, Guss., E. serpens, and E. 

 capitata; names from this group occur in American 

 catalogues, but the species to which they properly 

 belong are inconspicuous weeds. E. lorifolia, 

 Hillebr., of Hawaii, has recently been investigated 

 as a possible source of rubber. (Descriptions of 

 these species will be found in the floras.) 



B. Stipules present. 



1. marginata, Pursh (E. variegdta, Sims). SNOW- 

 ON-THE-MouNTAiN. GHOST-WEED. Fig. 1438. Annual, 

 about 2 ft. high, pubescent, dichotomously many- 

 branched: Ivs. numerous, light green, ovate-subcordate 

 to oblong-lanceolate, 1-3 in. long, the upper white- 

 margined, often entirely white: involucral glands with 

 large white appendages. July-Oct. Plains from Dak. 

 to Texas and extending eastward. B.M. 1747. Gt. 

 30:218. V. 2, p. 281; 5, p. 64. G.W. 13, p. 305. Hardy 

 annual, used for its white foliage in bedding and mixed 

 borders in sunny situations. 



2. sanguinea, Hort. (E. hsematbdes, Boiss.?). A tall 

 shrub: Ivs, ovate, obtusely pointed, in whorls of 3, 

 red when young to deep bronze or purplish red later. 

 This handsome plant of unknown nativity is cult, in 

 S. U. S. While it is not possible to classify it exactly 

 without fls. and fr., the foliage characters indicate its 

 relationship to E. cotinifolia, Linn. 



1440. Euphorbia pulcherrima (XK)- No. 8. 



BB. Stipules absent or microscopic, 

 c. Plant a perennial herb. 



3. corollata, Linn. (Tithymaldpsis corollata, Klotzsch 

 & Garcke). FLOWERING SPURGE. Fig. 1437. Plant 

 lJ^-3 ft. high, usually glabrous, slender and diffusely 

 branched above: Ivs. ovate-oblong to lanceolate, 1-2 

 in. long, those of the infl. much smaller and opposite: 

 involucral glands 5, with conspicuous white appendages. 

 July-Oct. On rather dry soil E. U. S. B.M. 2992. 

 L.B.C. 4:390. F.R. 1 :969. A hardy herbaceous peren- 

 nial used like gypsophila for cutting, and as a bedder in 



1441. Euphorbia heterophylla (X'.O. 

 No. 9. 



light soil. There are many variations in size, shape, 

 color and pubescence of plant, Ivs. and infl. 



4. Ipecacuanhas, Linn. (Tithymaldpsis Ipecacuanhas, 

 Small). IPECAC SPURGE. Only the forking infl. (3-6 in.) 

 above ground, with its red or green glabrous, opposite 

 Ivs. varying from 



oval to linear on 

 different plants, 

 the alternate Ivs. 

 of the short st. 

 usually subterran- 

 ean and scale-like: 

 cyathia long pe- 

 duncled; appen- 

 dages of glands 

 rudimentary. 

 April. Sandy soil 

 E. U.S. L.B.C. 12: 

 1145. B.M. 1494. 

 E. geniculata, 

 Ort., is sometimes 

 cult, under this 

 name. It is a plant 

 of Trop. Amer., 

 related to E. heter- 

 ophylla, but with 

 broader lys. the 

 upper whitish at 

 base. 



cc. Plant a shrub. 



5. fulgens, Karw. 

 ( E. jacquinisefldra, 

 Hook.). SCARLET 

 PLUME. Fig. 1439. 

 Small shrub with 



slender drooping branches: Ivs. long-petioled, lanceolate, 

 bright green: cyathia in small axillary cymes, with the 

 conspicuous appendages to the 5 involucral glands bright 

 scarlet. Mex. B.M. 3673. R.B. 39:41. F.C. 2:55. 

 R.H. 1905:440. Gn. 33:486; 39, p. 239; 67 p. 73. V. 

 2, p. 74. A.F. 16: 1551. G.M. 53:89. G. 4: 593. P.M. 

 4:31. Gng. 10:76. A handsome winter - blooming 

 plant, used for cut-fls. or for specimen plants. 



6. misera, Benth. Lvs. small, obovate, pubescent, 

 clustered at the end of crooked branches: fls. incon- 

 spicuous. S. Calif, and Mex. Recently catalogued 

 in the Calif, trade. 



7. antisyphilitica, Zucc. (Tricherostlgma antisyph- 

 ilitica, Klotzsch & Garcke). CANDELILLO. Slender, 

 erect, rod-like branches 1-3 ft. high, almost leafless. 

 Mex. The plants yield a useful wax and are some- 

 times grown in collections of succulents. 



AA. Glands of involucre without petal-like appendages. 



(Nos. 8-65) 



B. St. herbaceous or shrubby, not fleshy: Ivs. well devel- 

 oped, the upper colored: stipules minute: infl. 

 cymose. Section POINSETTIA. 



8. pulcherrima, Willd. (E. Poinsettiana, Buist. 

 Poinsettia pulcherrima, Graham). POINSETTIA. EASTER 

 FLOWER. CHRISTMAS FLOWER. LOBSTER FLOWER. 

 MEXICAN FLAME -LEAF. Fig. 1440. Shrub 2-10 ft. 

 high, branched: Ivs. ovate-elliptical to lanceolate, 

 entire, sinuate toothed or lobed, or panduriform, 3-6 

 in. long, somewhat pubescent, the upper narrower, 

 more entire to even linear-lanceolate and of the bright- 

 est vermilion-red: involucres 2-3 lines wide, greenish, 

 with one large yellow gland. Nov.-Marcn. Moist, 

 shaded parts of Trop. Mex. and Cent. Amer. B.M. 

 3493. G.C. III. 21:125, 193. F.C. 1:33. Mn. 7, p. 67. 

 Gn. M. 2:209. Sometimes cut, usually used for speci- 

 men plants and in masses, often used in decorations. 

 A gorgeous plant. Var. plenissima, Hort., has the fls., 

 or most of them, transformed into red bracts, giving 

 a fuller center. G.C. II. 5: 17. Gt. 28:182. F.M. 



