BRITTON AND ROSE—CEREUS AND ITS ALLIES. 423 
Harrisia gracilis ( Mill.) Britton, Bull. Torr. Club 35: 563. 1908. 
Cereus gracilis Mill. Gard, Dict. ed. 8. no. 8. 1768. 
Cereus repandus Haw. Syn. Pl. Succ. 183. 1812, not Cactus repandus L. 1753. 
?Cereus subrepandus Haw. Suppl. Pl. Suec, 78. 1819. 
Type Locauity: ‘ British Islands of America.’’ 
DISTRIBUTION: Jamaica. 
Harrisia nashii Britton, Bull. Torr. Club 35: 564. 1908. 
Type Locatiry: Between Gonaives and Plaisance, Haiti. 
DistrRisuTion: Haiti. 
Inuustration: Descourt. Fl. Med. Antill. 1: p/. 66, as Cactus divaricatus. 
Harrisia portoricensis Britton, Bull. Torr. Club 35: 563, 1908, 
Tyre Locauiry: Near Ponce, Porto Rico. 
Distripution: Porto Rico. 
Harrisia taylori Britton, Bull. Torr. Club 35: 565, 1908. 
TyPE LocaLiry: Between Rio Grande and Rio Ubero, in eastern Cuba. 
DistrrBpuTion: Cuba. 
Harrisia undata ( Pfeiff.) Britton, Bull. Torr. Club 35: 564. 1908. 
Cereusundatus Pieiff. Enum. Cact. 94. 1837. 
Type LocaLitry: Not given. 
DistrisputTion: Eastern Cuba. 
ILLusTRATIONS: Pfeiff. & Otto, Abb. u. Beschr. Cact. pl. 23. 
The following two species now under Cereus are likely to prove to be members of 
this genus: 
CEeREvs DIVARICATUS Lam. Eneyel. 1: 540. 1783. 
Cereus divergens Pfeiff. Enum. Cact. 95. 1837. 
Pilocereus divaricatus Lem. Rev. Hort. 1862: 427. 1862. 
Type LocaLity: Santo Domingo. 
DistripuTion: Santo Domingo and Haiti. 
ILLusTRATION: Plumier, Pl. Amer. ed. Burmann p/. 193. 
CrreEvus EREcTUs Karw.; Pfeiff. Enum. Cact. 95, 1837. 
’ 
Typr LocaLity: Mexico. 
7. NYCTOCEREUS gen. nov. 
Erect or straggling, slender, sparingly branched cacti, with cylindric fluted stems 
and branches, the numerous areoles bearing a tuft of short white wool and small 
radiating acicular bristles or weak spines; flowers large, white, nocturnal; ovary bear- 
ing small scales and tufts of weak spines or bristles; corolla funnelform, the nearly 
cylindric tube gradually expanded above, bearing scales and tufts of weak bristles 
below the middle, above the middle bearing distant, narrowly lanceolate scales, 
which grade into the blunt outer perianth segments; inner perianth segments widely 
spreading, obtuse or acutish; stamens numerous, shorter than the perianth; style 
about as long as the stamens; fruit scaly and spiny or bristly. The genus is, perhaps, 
heterogamous. 
Type species Cereus serpentinus DC. 
Nyctocereus was considered a subgenus by A. Berger under this name. 
Nyctocereus serpentinus (Lag. & Rodrig. ). 
Cactus serpentinus Lag. & Rodrig. Anal. Cienc. Nat. 4: 261. 1801. 
Cactus ambiguus Bonpl. Pl. Jard. Novar. et Malmais. pl. 38, 1803. 
Cereus serpentinus DC. Prod. 3: 467, 1828. 
85408—voL 12, pr 10—09 2 
