58 THE CACTACEAE. 



48. Cephalocereus ulei (iiirke, Monatsschr. Kaktcenk. 18: 85. 1908. 



"Trunk upright, strongly branched, columnar, several meters high, and in this instance 7 cm. 

 in diameter. Ribs 18 to 20, blunt, separated by deep furrows from each other and rather deeply 

 crenate, 8 to 9 mm. high, 7 to 8 mm. wide at the base, semi-elliptic and with rounded angles; areoles 

 10 to 12 mm. apart, elongated, 4 to 5 mm. in diameter, covered with gray wool, developing on one side 

 of the crown of a branch into a stout, brownish, dirty yellow cephalium, with wool about 8 to 10 mm. 

 long; radial spines 13 to 15, radiating, extending obliquely from the plant body, 10 to 12 mm. long; 

 central spines 2 or 3, somewhat longer than the radial spines, up to 18 mm. long; all of the spines 

 brown, not very sharp, elastic; flowers from the cephalium short, tubular, 45 mm. long, 17 to 20 

 mm. in diameter; ovary and tube thickly covered with lanceolate or narrowly triangular scales, 2 

 to 4 mm. long and bearing in their axils fascicles of short, closely lying reddish-brown hairs; petals 

 white, lanceolate-spatulate, with short tips, the innermost 10 mm. long and 5 mm. wide; anthers 

 arising from the upper part of the tube, not extending beyond the perianth; filaments 15 mm. long; 

 pistil 27 mm. long, the stigma slightly exceeding, with 10 stigma-lobes 3 mm. long; fruit pear-shaped, 

 6 cm. long, 4 cm. in diameter; seeds black, shining, 1.5 mm. long. 



"Of the hitherto known species of the genus Cephalocereus only one comes from Brazil, the rest 

 from Mexico. The Brazilian species, C. melocactus Schumann, has only 12 ribs; 3 to 6 radial spines; 

 red flowers, 3 cm. long; and through these characteristics differs from the here-described species." 

 Translated by Paul G. Russell from Ule, Monatsschr. Kakteenk. 18: 85. 1908. 



Type locality: Serra do S. Ignacio, Bahia, Brazil. 

 Distribution: Known only from the type locality. 



The plant is known to us only from the description and illustration. It would seem 

 from these to be related to C. dybowskii. 



Illustrations: Bot. Jahrb. Engler 40: Beibl. 93: pi. 9; Vegetationsbilder 6: pi. 18. 



PUBLISHED SPECIES. PERHAPS OF THIS GENUS. 



The species of this genus have often been described under Pilocereus, while others have 

 appeared under Cereus. There are also some species of Cephalocereus which we do not 

 know, and these are all grouped here under the above heading. 



CEPHALOCEREUS HERMENTIANUS (Monville) Britton and Rose, Contr. U. S. Nat. Herb. 12:416. 

 1909. 



Cereus hermentianus Monville, Illustr. Hort. 6: Misc. 90. 1859. 

 Pilocereits hermentianus Lemaire in Weber, Diet. Hort. Bois 965. 1898. 



Upright, slender, 3 meters high, 5 to 7 cm. in diameter, branching; ribs about 19, rounded, 

 shallow; areoles close together, round, with short brown wool and silky, persistent, hanging hairs; 

 spines about 20, small, slender, yellowish; flowers 5 to 6 cm. long. 



Type locality: Not cited. 



Distribution: Haiti, according to Weber. 



Monville did not know the origin of this species, but Weber assigned it to Haiti without 

 question. We do not know any cactus from Hispaniola with 19 ribs, but further explora- 

 tions may prove its occurrence there. 



PILOCEREUS ALBISETOSUS (Haworth) Schumann, Gesamtb. Kakteen 196. 1897. 

 Cereus albiselosus Haworth, Suppl. PL Succ. 77. 1819. 



This certainly does not belong to this genus. It may be a Selenicereus. Evidently a 

 low creeping plant, green, 5-angled, with areoles bearing brown wool and several white 

 setaceous spines. It is a native of " Domingo," and is said to be similar to Cereus reptans 

 It was introduced into England by A. B. Lambert in 1816. 



PILOCEREUS VERHEINEI Riimpler in Forster, Handb. Cact. ed. 2. 690. 1885. 



Columnar, simple so far as known, pale green, the apex covered with white wool, soon turning 

 gray; ribs 12 or 13, 8 to 10 mm. high, obtuse; areoles 6 to 8 mm. apart, 2 to 3 mm. in diameter; 

 spines yellowish at first, in age gray; radial spines 7 or 8, spreading, subulate, i to 1.5 cm. long; 

 central spine solitary or wanting, i cm. long. 



