CEPHALOCEREUS. 



33 



9. Cephalocereus euphorbioides (Haworth). 



1819. 



Cereus euphorbioides Haworth, Suppl. Pi. Succ. 75. 

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

 Pilocereus euphorbioides Riimpler in Forster, Handb. Cact 

 2. 658. 1885. 



ed 



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 sparingly 

 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. 





tF M 



' 4"*' 







Typ 



w 



Not cited. 



Distribution: The Index Kewensis says South 

 Schumann says Brazil, not Mexico; Riimpl 



Mexico 



America. Known to us only from 



specimens 



Riim 



refers here Cereus conicus Hort. Berol. 



Hnum 



from Mexico 



Cact. 97. 1837), which Pfeiffer states is 

 ereus olfersii Salm-Dyck (Hort, Dyck. 335, 

 1834) probably belongs here. The Theodosia B. Shepherd 

 Company, in tl " ~ 



Ifersii from 



m 



cent Cereus, exceedingly stout growth ; color light blue ; 

 beautiful spines which are jet black and very long." 



Cereus polyloph 

 flowers to this species. 



is 



y similar in 

 lUgh Haworth 



its habit and 



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

 In habit it resembles Cephalocereus jiuminensis. 



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

 cereus euphorbioides; Rev. Hort. 57*279. f. 47, 48, as Kig. 35— Cephalocereus euphorbioides. 



7/. 



from 



York Botanical Garden. 



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



Cereus russelianus Otto in Sahn Dyck, Cact. Hort. 



Dyck. 1849. 201. 1850. 

 Pilocereus russelianus Rumpler in Forster, HandU. 



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, 1 to i .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 ofif after anthesis at the top of the ovary ; top 

 of unopened flower tuberculate; upper scales and 

 outer perianth-segments broad, obtuse, thick, fleshy, 

 pinkish; inner perianth-segments narrow, almost 



Fig. 36 

 Fig. 37 



Flower of Cephalocereus russelianus 

 Fruit of same. X0.7. 



X0.7 



