CEPHALOCEREUS. 



43 



Schumann refers here Cereus vircns Pfeiffer (Enum. Cact. 99. 1837; Pilocereus 

 virens Lemaire, Illustr. Hort. 13: Misc. 20. 1866), but Pfeiffer really did not propose a 

 new name, although the plant he described may have been different from De Candolle's 

 (Mem. Mus. Hist. Nat. Paris 17: 116. 1828), which came from Mexico, for the latter is 

 definitely stated to have been sent by T. Coulter from there, and is described as a simple, 

 light green, 5-ribbed plant; it may be a Lemaireocereus. Schumann refers Cereus sub- 

 lanatus Salm-Dyck (Hort. Dyck. 337. 1834) here, but this reference is to be questioned. 

 If the two are the same the name sublanatus must be taken up instead of arrabidae. 



Cereus exerens Link (Pfeiffer, Enum. Cact. 99. 1837) was never described but given as 

 a synonym of Cereus virens. Cereus retroftexus Pfeiffer (Allg. Gartenz. 3:380. 1835) and 

 C. reflexus Steudel (Nom. ed. 2. i : 335. 

 1840) were given as synonyms of C. 

 tilophorus. Cereus ericomus, given as 

 a synonym of Pilocereus exerens, was 

 given by Salm-Dyck (Cact. Hort. Dyck. 

 1849. 47. 1 850) as a synonym of C.vireus. 



Illustrations: Schumann, Gesamtb. 

 Kakteen f. 39, as Pilocereus exerens; 

 Monatsschr. Kakteenk. 2: 4i,asP/'/D- 

 icrciis vircns; Martins, Fl. Bras, 4- : pi. 

 40, as Cereus macrogonus; Vellozo, Fl. 

 Flum. 5: pi. 1 8, as Cactus licxagonus; 

 also pi. 19, as Cactus heptagonus. 



FIG. 62. Fruit of Cephaloce- 

 reus arrabidae. Xo-7. 



FIG. 63. Cephalocereus arrabidae. 



Plate vi, figure i, shows a flowering joint of a plant brought by Dr. Rose to the New 

 York Botanical Garden from Iguaba Grande, Brazil, in 1915. Figure 62 shows the fruit 

 collected by Dr. Rose at Bahia in the same year; figure 63 is from a photograph taken 

 by Paul G. Russell on Juparyba Island, Bay of Rio de Janeiro, Brazil, in the same year. 



23. Cephalocereus urbanianus (Schumann) Britton and Rose, Contr. U. S. Nat. Herb. 12 : 420. 1909. 



Pilocereus urbanianus Schumann, Gesamtb. Kakteen 193. 1897. 



Cereus urbanianus Berger, Rep. Mo. Bot. Card. 16: 63. 1905. Not Giirke and Wemgart. 1904. 



.Simple and columnar or branching at base, sometimes 4 meters high, 3 cm. in diameter; branches 

 4 to 5 cm. in diameter, woolly at apex; ribs 8 to 12, obtuse; spines loto 1 3, spreading, stiff but flexuous; 

 central spines distinct from the radials; flowers on one side of the stem, the flowering areoles bearing 

 long brown wool and bristle-like spines often 4 to 6 cm. long; flowery to 4 cm. long ; ovary bearing 

 small scales; fruit depressed, 3 cm. broad; seeds black, smooth, shining. 



Type locality: Guadeloupe Island, West Indies. 



Distribution: Guadeloupe, Martinique, and, apparently, Grenada. 



We have not seen this species alive; it is based upon Pere Duss's No. 3506, of which 

 material is preserved in the herbaria of the New York Botanical Garden and the United 

 States National Museum. Specimens from Woodlands, St. George's, Grenada (W. E 

 Broadway, No. 1766) appear to be referable to this species. 



