BRITTON AND ROSE—CEREUS AND ITS ALLIES. 432 
Cereus vasmeri Young, Fl. Texas 276. 1873. 
Cereus dussti Schum. Gesamtb. Kakteen 89. 1899. 
Cereus sinul Weber; Gosselin, Bull. Mus. Paris 10: 384. 1904. 
TYPE LOCALITY: America. 
Distrisution: Southern Texas, south along the coast of Mexico to Costa Rica, 
Central America; Florida Keys; Cuba; Guadeloupe. 
IuLusTRATION: Engelm. loc. cit. pl. 60. f. 5, 6. 
According to Salm-Dyck4 this is Cactus pentagonus L. = Cereus pentagonus (L.) 
Haw., and this view is supported by Weber. 
18. LEPTOCEREUS gen. nov. 
Stems diffusely branching; branches slender, usually with 6 prominent thin ribs, 
so far as known not giving off roots; spines slender, similar; flowers diurnal(?), 
small; calyx tube short; stamens and style included; ovary and fruit very spiny. 
Type species Cereus assurgens Griseb., as also of A. Berger’s subgenus Leptocereus. 
Leptocereus assurgens ((riseb. ). 
Cereus assurgens Griseb, Cat. Pl. Cub. 116. 1866. 
Type LocALity: Western Cuba. 
Distripution: Cuba. 
ILLusTRATION: Schum. Gesamtb. Kakteen f. 33; Hartmann, loc. cit. 
The following species referred to Cereus when better known may be found to be- 
long to Leptocereus: 
CEREUS QUADRICosTATUS Bello, Ann. Soc. Espan. Hist. Nat. 10: 276. 1881. 
TyPE LocaALiItTy: Porto Rico. 
Distrisution: Porto Rico. 
19. HELIOCEREUS gen. nov. 
Stems usually weak, procumbent or climbing over rocks and bushes, in cultivation 
often erect; branches strongly angled, giving off roots irregularly; ribs usually 3 or 4, 
sometimes 7; spines of all areoles similar; flowers diurnal, large for the size of the 
plant, only one from an areole, usually scarlet; tube short but definite; petals elon- 
gated; stamens numerous, declined; ovary spiny. 
Type species Cactus speciosus Cav. 
Heliocereus was considered a subgenus of Cereus by A. Berger, whose name we 
have adopted. 
Heliocereus amecaensis (Heese). 
Cereus ainecaensis Heese; Rother, Praktischer Ratgeb. 11: 442. 1896. 
Type LocaLity: Iztaccihuatl near Amecameca, Mexico, 
DistRiBUTION: Known only from the type locality. 
ILLUSTRATION: Heese, loc. cit. 
Heliocereus coccineus (Salin-Dyck). 
Cereus coccineus Salm-Dyck; Pfeiff. Enum. Cact. 122. 1837. 
TYPE LocALItTy: Mexico. 
DisrrispuTion: Mexico. 
ILLUsTRATION: Pfeiff. & Otto, Abb. u. Besch. 1: pl. 15. 
a Cact. Hort. Dyck 49. 
b Bull. Mus. Hist. Nat. 8: 457. 
