5° 



THE CACTACEAE. 



35. Cephalocereus royenii (Linnaeus) Britton and Rose, Contr. U. S. Nat. Herb. 12: 419. 1909. 



Cactus royenii Linnaeus, Sp. PI. 467. 1753. 



Cereus royenii Miller, Gard. Diet. ed. 8. No. 7. 1768. 



Cereus fulvispinosus Haworth, Syn. PI. Succ. 183. 1812. 



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



Cereus floccosus Otto in Pfeiffer, Enum. Cact. 81. 1837. 



Cereus armatus Otto in Pfeiffer, Enum. Cact. 81. 1837. 



Pilocereus floccosus Lemaire, Illustr. Hort. 13: under pi. 470. 1866. 



Cereus leiocarpus Bello, Anal. Soc. Esp. Hist. Nat. 10: 276. 1881. 



Pilocereus barbatus Rebut in Forster, Handb. Cact. ed. 2. 650. 1885. 



Pilocereus royenii Riimpler in Forster, Handb. Cact. ed. 2. 682. 1885. 



Pilocereus royeni armatus Salm-Dyck in Forster, Handb. Cact. ed. 2. 682. 1885. 



Pilocereus strictus fouachianus Schumann, Gesamtb. Kakteen 190. 1897. 



Pilocereus fulvispinoszis Schumann, Gesamtb. Kakteen 196. 1897. 



Pilocereus fouachianus Weber in Gosselin, Bull. Mus. Hist. Nat. Paris 10: 386. 1904. 



Cereus fouachianus Vaupel, Monatsschr. Kakteenk. 23: 25. 1913. 



Fig. 73. — Cephalocereus lanuginosus. 



Fig. 74. — Cephalocereus royenii. 



Stout, 2 to 8 meters high or more, either branching near the base or with a short definite trunk 

 up to 3 dm. in diameter; branches stout, erect or ascending, glaucous, green to blue; ribs 7 to n, 

 high; areoles close together; spines acicular, very variable, often only 1 cm. long, but sometimes 

 6 cm. long, yellow; young areoles bearing soft wool; flowering areoles producing tufts of long white 

 hairs; flowers about 5 cm. long, greenish yellow to purplish; inner perianth-segments white, acute; 

 fruit reddish or green, 5 cm. broad; pulp red; seeds black, shining. 



Type locality: America, but no definite locality cited. 



Distribution: Antigua to Anegada, St. Croix, St. Thomas, Culebra, Porto Rico, Mona, 

 and Desecheo. 



Philip Miller states that this species was sent to him from the British Islands of 

 America in 1728. The combination Cereus royenii is generally credited to Haworth (18 12), 

 but it was first used by Miller in 1768, although the true Cactus royenii of Linnaeus may not 

 be the one he actually described. 



