224 THE CACTACEAE. 



Collected on island of Grenada, British West Indies, by N. L. Britton and T. E. Hazen, 

 February 24, 1920. Type from a slope on the harbor of St. George's. 



As observed on the date of collection, this cactus is abundant about the harbor of 

 St. George's and a conspicuous element of the vegetation; it was also studied on hills else- 

 where in the southern part of the island, but only the type plant was seen in bloom. The 

 species is closely related to Cereus repandus Miller of Curacao, differing in its shorter 

 spines, somewhat smaller, purple flowers, continuous unconstricted branches and trans- 

 versely grooved ribs, and also to Cereus margaritensis Johnston of Margarita, from which 

 it differs by straight spines, somewhat larger flowers, and grooved ribs. The fruit was 

 said by negroes to be edible when ripe. It is called dildo, a common West Indian name 

 for the tall-branching, cereus-like cacti. 



Figure 303 shows the type plant; figure 304 shows one of its branches photographed 

 by T. E. Hazen. 



Cereus. (See page 21, ante.) 



Cephalocereus californicus Hortus is credited by the Index Kewensis to Schumann 

 (Engler and Prantl, Pflanzenfam. 36a; 182. 1894), although it is not quite certain whether 

 Schumann intended to list this name under Cephalocereus or as Cereus californicus. The 

 Cereus californicus Nuttall we have already referred to Opuntia serpentina (see 1 : 58, ante). 



Cereus chlorocarpus De Candolle (Prodr. 3: 466. 1828; Cactus chlorocarpus Humboldt, 

 Bonpland, and Kunth, Nov. Gen. et Sp. 6: 67. 1823) which originally came from the Peru- 

 vian and Ecuadorean boundary has not been identified. It is evidently not a true Cereus. 



Cereus columnaris Loddiges (Voigt, Hort. Suburb. Calcutt. 61. 1845) is said to have 

 been introduced into suburbs of Calcutta in 1840. Otherwise it is unknown. This 

 name may apply to Cereus hexagonus (L.) Miller. 



Cereus flavispinus hexagonus Salm-Dyck (Hort. Dyck. 63. 1834) is only a name. 



Cereus geminisetus Reichenbach (Terscheck, Suppl. Cact. Verz. 3) we know only from 

 Walpers's (Repert. Bot. 2: 340. 1843) brief description of a sterile plant of unknown origin. 



Cereus heteracanthus Tweedie (Sweet, Hort. Brit. ed. 3. 284. 1839) was described simply 

 as a variable-spined Cereus. 



Cereus ictidurus (Hort. Univ. 1: 224. 1839), called the martin's-tail-cereus, reported 

 as soon to be figured and described, we do not know. 



Cereus zizkaanus or C. ziczkaanus (Montasschr. Kakteenk. 5: 44. 1895) is figured in 

 the Gardeners' Chronicle for 1873 (75. f. 15) where it is referred to Cereus eburneus with 

 a question. It is said to have come from Gruson's garden. This is doubtless the same as 

 Cereus chilensis zizkaanus, sometimes spelled zizkeanus (see page 137, ante). 



Pilocereus pfeifferi, sometimes credited to Otto, occurs frequently in German cactus 

 works, but we have seen no description. The name is not found in the Index Kewensis 

 or in Schumann's Monograph. Dr. Rose saw a living specimen in the Berlin Botanical 

 Garden labeled "Pilocereus pfeifferi, Mexico" which he noted at the time as near Lemaire- 

 ocereus treleasei. 



Monvillea cavendishii. (See page 21, ante.) 



Related to this species is the following which we know only from description : 



CEREUS chacoanus Vaupel, Monatsschr. Kakteenk, 26: 121. 1916. 



Erect, 2 to 4 meters high, 6 cm. in diameter; ribs 8; spines 9 or 10; central spine solitary, 

 6 cm. long; flowers funnelform, 15 cm. long; outer perianth-segm3nts rose-colored; inner perianth- 

 segments white; fruit subglobose to ovoid, 3 cm. long. 



Type locality: Gran Chaco, Paraguay. 

 Distribution: Paraguay. 



