BRITTON AND ROSE—CEREUS AND ITS ALLIES, 415 
Rathbunia alamosensis (Coult.). 
Cereus alamosensis Coult. Contr. Nat. Herb. 3: 406. 1896. 
Type LocaLity: Near Alamos, Sonora. 
DisrripuTion: Southern Sonora and northern Sinaloa, Mexico. 
Rathbunia kerberi (Schum. ). 
Cereus kerberi Schum. Gesamtb. Kakteen 89. 1899. 
Type LocaLity: On Voleano of Colima, Mexico. 
Disrrisution: Sinaloa, Tepic, and Colima, Mexico. 
Rathbunia sonorensis (Runge). 
Cereus sonorensis Runge in Schum. Monatssch. Kakteenk. 11: 135, 1901. 
Type Locauity: In Sonora. 
Distrisution: Central Sonora, Mexico. 
ILLustrATIoN: Monatssch. Kakteenk. loc. cit.; Schumann, Gesamtb. Kakteen 
Nachtr. f. 4, as C. stellatus; Ann. Rep. Mo. Bot. Gard. 16: pl. 3. f. 4. 
3. CEPHALOCEREUS Pieiff. Allg. Gartenz. 6: 142. 1838. 
Usually very large plants, either with a simple trunk or more or less branched; 
upper areoles usually developing wool, in some species forming a distinct cephalium 
either at the top or at one side near the top; flowers nocturnal, thick, fleshy, com- 
paratively small, one from an areole, with a short definite funnel-shaped tube with 
few bracts; sepals and petals rather fleshy; ovary globular, naked or with a few 
bracts, spineless; fruit a small globular or depressed-globose berry; seeds numerous, 
small, reticulate, black or brownish, shining, with an oblique basal depressed hylum. 
Type species Cactus senilis Haw. (which is also the type species of Pilocereus Lem. 
Cact. Gen. Nov. & Sp..6. 1839), 
Cephalocereus aleusis (Weber). 
Pilocereus aleusis Weber; Gosselin, Bull. Mus. Paris 11: 508. 1905. 
Type LocaLity: Sierra del Alo (and near Manzanillo, in forests bordering the 
sea), Mexico. 
Distrisution: Known only from the type locality, but doubtless of wider distri- 
bution. Clearly a Cephalocereus, but known to us only from description. 
Cephalocereus bahamensis Britton, sp. nov. 
Plant 3 to 4 meters high, often 20 cm. thick at the base, the branches divergent- 
ascending, 7 to 9 cm. thick, dull green, not pruinose, 10 or ll-ribbed, the ribs 
blunt or acutish, rather higher than wide; areoles 1 to 1.5 cm. apart; spines 15 to 
20, acicular, radiately spreading and ascending, gray-brown to yellow-brown when 
old, 1 to 1.5 em. long, the young ones yellowish with darker bases, the uppermost 
2.5 to 8 em. long; wool very short (shorter than the spines), or none; flower 5 to 
6 em. long, brownish outside, the petals creamy-white; style slightly exserted; fruit 
depressed-globose, 3 to 4 cm. in diameter. ° 
Banamas: Frozen Cay, Berry Islands (Britton & Millspaugh 2221, January 30, 
1905, type); Eleuthera (Britton & Millspaugh 5431); Andros (Northrop 699; 
Brace 5054); Cat Island ( Wilson 7185); Crooked Island ( Brace 4695); Abaco 
( Brace 2051). 
Cephalocereus bakeri, sp. nov. ; 
Plant 3 to 4 meters high, branching ntar and above the base, the branches 7 to 
10 em. thick, dull green, slightly glaucous; ribs 10 or 11, acutish; areoles 1 to 1.5 
cm. apart; spines 15 to 20, acicular, 1 to 2.5 cm. long, yellow when young, becoming 
gray; flowering areoles closely set, producing only short yellow spines, the centrals 
hardly different from the radials; flowers deep purple, glaucous, 5 cm. long; ovary 
naked except for a few ovate bracts. 
Collected by C. F. Baker at Cojimar, Province of Havana, Cuba, March 14, 1905 
(no. 2731); collected also by C. Wright (no. 2621) and recorded by Grisebach as C. 
royent armatus. 
