CEPHALOCEREUS. 



53 



(Cephalocereus sartorianus),andis sometimes applied to the Guatemalan species (C. maxonil). 

 As a result of Dr. Rose's explorations in Sonora in 1910, additional material, both living 

 and herbarium, was obtained, which enables us to reestablish this species as Sonoran. 



In 1908, Dr. Palmer sent photographs and speci- 

 mens of a Cephalocereus from Batopilas, Chihuahua, 

 which we believe may belong here. 



Cereus foersteri (Sencke, Cat. 1861) and Pilocereus 

 marschalleckianus (Zeissold, Cat. 1899) are given by 

 Schumann as synonyms of this species. The latter 

 is mentioned in Nicholson's Dictionary of Gardening 

 (Suppl. 602. 1901) as having been introduced but very 

 rare in cultivation. 



Illustrations: Diet. Gard. Nicholson 3: f. 153; 

 Gartenwelt 7: 291 ; Knippel, Kakteen pi. 29; Lemaire, 

 Cact. f. 5, 6; Monatsschr. Kakteenk. 3: 145; u: 76; 

 21:37; 22: T 33; Engler and Prantl, Pflanzenfam. 3 6a : 

 f. 59, A, B; Rev. Hort. 1862: f. 38 to 41; Forster, 

 Handb. Cact. ed. 2. f. 89, 90; Riimpler, Sukkulenten 

 f. 77; Rev. Hort. Beige 40: after 184, all as Pilocereus 

 luniUctii; Cact. Journ. 2:5, as P. houlletianus; Rep. 

 Mo. Bot. Gard. 16: pi. 4, f. 3, 4, as Ccrctts Iionllctii. 



Figure 77 is from a photograph by E. Palmer, at 

 Batopilas, Chihuahua, in 1908. 



39. Cephalocereus sartorianus Rose, Contr. U. S. Nat. 



Herb. 12: 419. 1909. 



Plant 3 to 5 meters high or more, with nearly erect 

 branches, these 7 to 10 cm. in diameter, bluish or bluish 

 green; ribs (in the three individuals examined) 7, 2 cm. 

 high, marked by a pair of grooves descending obliquely, 

 one on each side, from each areole; areoles closely set, usu- 

 ally 1.5 cm. apart; radial spines at first 7 or 8, others appar- 

 ently developing later; central normally one; all spines 

 short, i cm. long or less, at first straw-colored, in age gray- 

 ish; all areoles producing few or many cobwebby hairs; 

 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. 



Type locality: State of Vera Cruz, Mexico. 



Distribution: Vera Cruz, Mexico. 



In the original description, based on material sent by Dr. C. A. Purpus, we stated 

 that the branches were "light or yellowish green, apparently not pruinose." The illus- 

 tration in Bliihende Kakteen referred to below, however, shows very blue and probably 

 pruinose branches. 



It seems to grow in thickets, and is very slender, with a few slender, nearly erect 

 branches bearing large masses of wool at the top. 



Illustration: Bliihende Kakteen 2: pi. 79, as Pilocereus houlletii. 



40. Cephalocereus pahneri Rose, Contr. U. S. Nat. Herb. 12: 418. 1909. 



Cereus virtoriensis Vaupel, Monatsschr. Kakteenk. 23: 24. 1913. 



Tall, 2 to 6 meters high, with 20 branches or more (often 5 to 8 cm. in diameter), dark green or 

 when young glaucous and bluish; ribs 7 to 9, rounded on the edge, rather closely set, clothed from 

 top downward for 20 to 30 cm. with long white hairs (4 to 5 cm. long) usually hiding the brown 



1 ? IG. 77. Cephalocereus leucocephalus. 



