58 



THE CACTACEAE. 



Monatsschr. Kakteenk. i8: 85. 1908. 



cm 



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



with 



mm. aoart. elongated, 4 to s mm. in diameter, covered with 



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 



from the ceohalium short, tubular, 4.=^ mm 



gul 



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



mm. lonsf and ^ mm 



mm 



with 10 stigma 



mm. long. 



ocereus onlv one comes from 



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 hermenlianus Monville, Illustr. Hort. 6: Misc. 90. 1859. 

 Pilocereus hermentiantis 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. 



P11.OCEREUS AI.BISETOSUS (Haworth) Schumann, Gesamtb. Kakteen 196. 1897. 



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



certainly does not belong to this genus. 

 Ding: plant, erreen. '^-aneled. with areoles t 



may be a Selenicereus. Evidently 



setaceous spines. It is a native of *' Domingo 



> J 



similar to Cereus rept 



England by A. B. Lambert 



P11.OCEREUS 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. 



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