BRITTON AND ROSE—CEREUS AND ITS ALLIES. 419 
Tyre Locauity: Santo Domingo. 
DistriputTion: Santo Domingo. 
InLustration: Plumier, Pl. Am. ed. Burmann pl. 196. 
From the figure, which shows a plant without wool, and from the description, 
which mentions no wool, this resembles C. bahamensis Britton. It is doubtless a 
Cephalocereus. 
Cephalocereus polylophus (DC.). 
Cereus polylophus DC. Mem. Mus. Paris 17: 115. 1828. 
Pilocereus polylophus Salm-Dyck, Cact. Hort. Dyck. ed, 2. 40, 1880, 
Type Locaity: ‘In Mexico.” 
DrstRIBUTION: Eastern Mexico. 
Known to dealers in cacti as Cereus nickelsii. 
Cephalocereus royeni (L.). 
Cactus royent L. Sp. Pl. 467. 1753. 
Cereus royent Haw. Syn. Pl. Succ. 182, 1812. 
Pilocereus floccosus Lem. Ill. Hortic. 18: under pl. 770. 1866. 
Cereus armatus Otto; Pfeiff. Enum. Cact. 81. 1837. 
Cereus floccosus Otto; Pfeiff. Enum. Cact. 81. 1837. 
Pilocereus royeni Riimpl. Forst. Handb, Cact. ed. 2. 682. 1886. 
Pilocereus fowachianus Weber; Gosselin, Bull. Mus. Paris 10: 386. 1904. 
Type LocaLiry: In America, presumably St. Croix. 
Disrripution: St. Croix, St. Thomas, Culebra, Porto Rico, Cuba?. 
ILtLustRation: Journ, N. Y. Bot. Gard. 7: f. 4. 
The Cuban plant may prove to be specifically distinct. 
Cephalocereus sartorianus Rose, sp. Dov. 
Plant 3 to 5 or more meters high with nearly erect branches, 7 to 10 cm. in diame- 
ter, light or yellowish green, apparently not pruinose; ribs (in three individuals 
examined) 7, 2 em. deep, marked by a pair of grooves descending obliquely, one on 
each side, from the areoles; areoles closely set, usually 1.5 cm. apart; radial spincs 
at first 7 or 8, others apparently developing later; central normally one; all spincs 
short, 1 em. or less long, at first straw-colored, in age grayish; all areoles producing 
few or many cobwebby hairs; the flowering areoles appearing on one side of the 
plant, in the specimen under observation on a single rib, and producing long white 
hairs 4 to 6 cm. long; flowers 6 to 8 cm. long, ‘dirty rose red;”’ fruit red. 
Described from two young plants and the top of an old one sent by Dr. C. A. Par- 
pus and the late Dr. A. Sartorius from the State of Veracruz, Mexico. 
Type U. 8. National Herbarium no. 574992. 
This is doubtless the Pilocereus houlletiti of Schumann’s Monograph and of most 
writers, but the type of the original species came from Sonora, Mexico. 
[LLusrraTION: Bliihende Kakteen pl. 79, as Pilocereus houlletii. 
Cephalocereus scoparius (Poselg. ). 
Pilocereus scoparius Poselg. Allg. Gartenz. 21: 126, 1853. 
Type LocaLiry: Soledad, near Veracruz, Mexico. 
DisrripuTion: Type locality and vicinity. 
Cephalocereus senilis (Haw. ) Pfeiff. Allg. Gartenz. 6: 142. 1838. 
Cactus senilis Haw. Phil. Mag. 63: 41. 1824. 
Cereus senilis DC. Prod. 8: 464. 1828. 
Pilocereus senilis Lem, Cact. Gen. & Sp. Nov. 6. 1889. 
Cactus bradypus Lehm. Index Sem. Hamburg 17. 1826. 
Typr Locatiry: Mexico. 
Disrripution; Hidalgo and Guanajuato, Mexico, 
