33 



CEPHALOCEREUS. 



9. Cephalocereus euphorbioides (Haworth). 



Cerctts euphorbioides Hawnrth, Suppl. PI. Succ. 75. 1819. 

 Caclus euphorbioides Sprengel, Syst. 2: 496. 1825. 

 Pilocereus euphorbioides Riimpler in Forster, Handb Cact ed 

 2. 658. 1885. 



Plant 3 to 5 meters high, columnar, usually simple; ribs 8, 

 acute, somewhat crenate ; areoles less than i cm. apart, white- 

 felted; spines few, sometimes only 4 or 5, and then only i prom- 

 inent, dark brown, porrect, about i cm. long; ovary 2 cm. long, 

 spirally tuberculate ; tubercles bearing triangular scales sparingfy 

 woolly in their axils, with i to 4 yellow spines; perianth-tube fun- 

 nelform, campanulate, 4.5 cm. long; outer perianth-segments 15 

 mm. long, fleshy, reflexed, brown or reddish brown, the inner 

 ones 2 cm. long, reflexed, rose-red; flowers diurnal. 



Type locality: Not cited. 



Distribution: The Index Kewensis says South Amer- 

 ica; Schumann says Brazil, not Mexico; Riimpler says 

 Mexico and tropical America. Known to us only from 

 cultivated specimens. 



Riimpler refers here Corns conicus Hort. Berol. 

 (Pfeiffer, Enum. Cact. 97. 1837), which Pfeiffer states is 

 from Mexico. Ccrcus oljersii Salm-Dyck (Hort. Dyck. 335. 

 1834) probably belongs here. The Theodosia B. Shepherd 

 Company, in their Descriptive Catalogue for 1916, describes 

 briefly Cercus olj'crsii from Brazil as follows: "A magnifi- 

 cent Ccrcus, exceedingly stout growth; color light blue; 

 beautiful spines which are jet black and very long." 



Ccrcus polylophus is very similar in its habit and 

 flowers to this species. Although Haworth did not know 

 its origin, it is usually stated to have come from Brazil. 

 In habit it resembles Ccphaloccrcns fliiininciisis. 



Illustrations: Monatsschr. Kakteenk. 17: 89, as Pilo- 

 cereus euphorbioides; Rev. Hort. 57: 279. f. 47, 48, as 

 Cereus oljersii. 



Figure 35 is from a photograph of a plant in the New York Botanical Garden. 



10. Cephalocereus russelianus KUto) Rose, Stand. Cycl. Hort. Bailey 2: 715. 1914. 



Cereus russelianus Otto in Salm Dyck, Cact. Hurt. 



Dyck. 1849. 201. 1850. 

 Pilocereus russelianus Kiitnpk'r in Forster, Haiulli. 



Cact. ed. 2. 682. 1885. 



Often tree-like, up to 8 meters high, with a 

 much branched top and a definite woody trunk, 2 

 meters long and 2.5 dm. in diameter; branches elon- 

 gated, nearly erect, dark green ; ribs 4 to 6, stout, with 

 prominent horizontal creases on the sides; areoles i 

 to 2 cm. apart, large and circular, when young bear- 

 ing white wool sometimes i to 1.5 cm. long; spines 8 

 to 14, at first dark brown but in age becoming gray 

 except at the tips, i to 1.5 cm. long; flowers nocturnal, 

 7 to 9 cm. long, appearing from areoles anywhere on 

 the branches or even from the base of the old trunk, 

 cutting off after anthesis at the top of the ovary; top 

 of unopened flower tuberculate; upper scales and 



outer perianth-segments broad, obtuse, thick, fleshy. FlG _ 36 ._ F i ower of Cephalocereus russelianus. Xo. 7 . 

 pinkish; inner perianth-segments narrow, almost FIG. 37. Fruit of same. Xo.?. 



FIG, 35. Cephalocereus euphorbioides. 



