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CEREUS. 



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for C. peruvianus monstrosus minor (Salm-Dyck, Cact. Hort. Dyck. 1849. 46. 1850). 

 C. peruvianus hrasiliensis (Forster, Handb. Cact. 390. 1846) probably docs not apply to 

 this species. 



Cereus surinamensis Trew (Ephem. Nat. Cur. 3:394. pi. 7, 8, 1733) is referred here 

 by Forster, but to C. monoclonos by Pfeiffer. The illustrations, though poor, indicate that 

 it is a Cereus and not a Cephalocereus. From the name we should expect it to be referable 

 to Cereus hexagonus. 



Forster (Handb. Cact, 389. 1846) states that Pfeiffer has called this plant Cereus 

 decandollii, but Forster doubts the correctness of this. 



This species has longlDcen known Under the name of Cereus peruvianus, and is probably 

 the most widely cultivated Cereus. In conservatories it is rarely found more than 2 

 meters in height. 



Illustrations: Anal. Mus. Nac. Montevideo 5: pi. i, 28 to 31; 



Bliihende Kakteen 3: pi. 131; Cact. Journ. 2: March; Hist. Acad. 

 Paris 1 741: pi. 4, 5; Monatsschr. Kakteenk. 10: 7; Pfeiffer, Abbild. 

 Beschr. Cact. 2: pi. 5; Rep. Mo. Bot. Gard. 5: pi. opp. 12; Stand. 



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Cycl. Hort. Bailey 2: f. 884, all as Cereus peruvianus; Cact. Journ. 



1 : 79; October; Gard. Chron. 1873; f. 31 ; III. 24: f. 46; Home Farm. 



Gard. III. 66: 145; Mem. Mus. Hist, Nat. Paris 17: pi. 11, all as ^ 



Cereus peruvianus monstrosus; Gerarde, Herball ed. i. 1015; ed. 2 



and 3, 1 179, all as Cereus peruvianus spinosus; Bradley, Hist. Fig. 13.— c. peruvianas. 



Succ. PI. ed. 2. pi, I, as' Cereus erectus maximus etc; DeTussac, Xo.s. 



Fl. Antill. 2: pi. 33; Loudon, Encycl. PL 410. f. 6855, as Cactus peruvianus. : 



Plate II, figure 2, represents the top of a plant in the collection of the New York 

 Botanical Garden; figure 3 shows the flower of the same plant. Figure 13 shows a fruit of 



a plant in the same collection. 



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14. Cereus perlucens Schumann, Monatsschr. Kakteenk. 10: 173. 1900. 



Columnar, erect, not very high; ribs 6 or 7, thin but obtuse, 4 to 6 mm. high, bright green or 

 more or less bluish green or even violet when young, somewhat pruinose; areoles about i cm. apart, 

 circular, bearing curly woolly hairs; radial spines 8 to 10, chestnut-brown, spreading, acicular, 

 I cm. long; central spine solitary, stouter than the radials. 



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Type locality: Along the Amazon, Manaos, Brazil. 



Distribution: Brazil. ' ^ • 



We know this species only from a cutting received from the Berlin Botanical Garden; 

 Dr. Schumahh referred it to his series Formosi, between his C. pitajdyd (C. obtusus) and 

 C. caesius; he did not know the flower, however, and was not certain but that it might 

 not belong to his genus Pilocereus; the cutting appears to us to represent a Cereiis. 



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^15. Cereus variabilis Pfeiffer, Enum. Cact. 105. 1837. 



Creeping over rocks or clambering into trees, up to 4 meters high ; stem made up of short thick 

 joints, 18 to 30 cm. long by 6 to 9 cm. in diameter; ribs 3 to 5, stout, when old strongly crenate, 

 obtuse, with strong indentations on the sides extending from the areoles with a broad upward bend 

 to the bottoms of the ribs; spines about 8, yellowish, the longest about 5.5 cm. long; flower 20 to 

 27 cm. long, with a very slender, green, and somewhat angled tube; scales of the ovarj^ and lower 

 part of the flower-tube ovate, acute; outer perianth-segments green or yellowish green, linear, acute; 

 inner perianth-segments white. 



Type locality: Not definitely cited. 



Distribution: Coast of ce 



The plant collected by Dr. Rose on Ilha Grande, near Rio de J 

 New York Botanical Garden, August 9, 191 6, the flower being um 

 convinced that this is the plant illustrated as below cited. Here 



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