88 F. Fedde und K. Schuster: Index novarum Siphonogamarum. [88 



an areole, usually scarlet; tube short but definite; petals elongated; 



stamens numerous, declined; ovary spiny. Heliocereus was considered a 



subgenus of Cereus by A. ßerger, whose name we have adopted. 

 Heliocereus amecaensis (Heese) Britton and Rose 1. c. p. 433 (= Cereus amecaensis 



Heese). — Mexiko, 

 H. coccineus (Salm-Dyck) Britton and Rose 1. c. p. 433 {= Cereus coccineus Salm- 



Dyck). — Mexiko. 

 R. Schrankii (Zucc.) Britton and Brown 1. c. p. 434 (= Cereus Schrankii Zucc.)* 



— Mexiko. 



H. speciosus (Cav.) Britton and Rose 1. c. p. 434 (= Cactus speciosus Cav. = C. 

 speciosissimus = Cereus bifrons Haw. = Cereus speciosissimus DC. = Cereus 

 speciosus Schum.), — Mexiko. 



Hylocereas Britton and Rose gen. nov. 1. c. p. 428. 



Climbing cacti, with elongated, 3-angled or 3-winged stems and 

 branches emitting aerial roots, their areoles bearing several short spines 

 and a tuft of very short wool; flowers very large, nocturnal, funnel- 

 form, the limb as long as the tube or longer; ovary and tube 

 bearing large foliaceous scales but without spines, wood, orhairs; outer 

 perianth Segments similar to the scales of the tube, but longer; petaloid 

 perianth segments narrow, acute or acuminate, mostly white; stamens 

 very many, in two series equalling or shorter than the style ; style 

 cylindric, rather stout, the linear stigmas numerous; fruit with several 

 or many persistent foliaceous scales. 



Rylocereus was considered a subgenus of Cereus by A. Berger 

 under this name. 



H. calcaratus (Weber) Britton and Rose 1. c. p. 428 (= Cereus calcaratus Weber). 



— Costarica. 



E. costaricensis (Weber) ßritton and Rose 1. c. p. 428 (= Cereus trigonus costari- 



censis Weber). — ibid. 

 H. Lemairei (Hook.) Britton and Rose 1. c. p. 428 (= Cereus Lemairei Hook.). 



— Antigua. 



H. Napoleonis (Graham) Britton and Rose 1. c. p. 429 (= Cereus Napoleonis 

 Graham = G. triangularis major Salm-Dyck). — West-Indien, Southern 

 Mexiko. 



H. ocamponis (Salm-Dyck) Britton and Rose 1. c. p. 429 (= Cereus ocamponis 

 Salm-Dyck). — Mexico or Colombia. 



H. stenopterus (Weber) Britton and Rose 1. c. p. 429 (= Cereus stenopterus 

 Weber). — Costarica. 



H. triangularis (L.) Britton and Rose 1. c. p. 429 (= Cactus triangularis L. = 

 Cereus compressus Mill. = Cereus triangularis Haw. = Cereus trigonus 

 Haw. = Cereus anizogonus Salm-Dyck). — Brasilia, Jamaica. 



E. tricostatus (Gosselin) Britton and Rose 1. c. p. 429 (= Cereus tricostatus 

 Gosselin). — Mexiko. 



Lemaireocereas Britton and Rose gen. nov. 1. c. p 424. 



Plauts usually very large, tall and branching or sometimes 

 prostrate; spines usually stout and numerous; flowers diurnal, Single at 

 the areoles, with a more or less elongated funnelform tube; stamens 

 numerous, borne in many rows all along the surface of the throat; sur- 

 face of ovary covered with fleshy tubercles, each crowned by a small 

 bract; axils of the bracts filled with short hairs or dense wool, at first 



