86 F. Fedcle und K. Schuster: Index novarum Siphonogamaruvn. [§6 



Caotaceae. 

 Acanthocerens Britton and Rose gen. nov. in Contrib. U. S. Nat. Herb. 

 Washington XII (1909). p. 432. 



Night- flowering cacti, with elongated, erect or reclining, 3 to 

 6-angled rootless stems and large funnelform flowers; areoles of the 

 Sterns distant from each other, bearing a tufs of short wool and several 

 sliff spines; ovarj with several or many areoles bearing wool and spines; 

 corolla-tube green, cylindric, slender, expanded only at the sumrait, 

 bearing a few similar areoles subtended by a small scale, the limb 

 somewhat shorter than the tube, widely expanded; sepals narrowly 

 lanceolate, acuminate, green, shorter than the white petals; stamens 

 shorter than the petals; style very slender, divided at the apex into 

 several linear stigmas; berry (according to Schumann) scaly and spiny, 

 with a thick skin, red flesh, and numerous thick black seeds. Acantlio- 

 cereus was considered a subgenus of Cereus by A. Berger. 



A. pentagonits (L.) Britton and Rose 1. c. p. 432 (= Cadus pentagomis L. 



= Cereus pentaqomis Haw. = C. acutangulus Otto = (7. baxaniensis Karw. 

 = C. ramosus Karw. =i C. principes Pfeiff. = C. pellucidus Otto = C- 

 nitidus Salm-Dyck = 0. variahiUs Engelm. = C. Vasmeri Young = C. 

 Dussii Schum. = C. sinul Weber). — Amerika. 



Aporocadus leptopläs (D(J.) Britton and Rose in Contrib. L'. S. Nat. Herb. 

 Washington XII (1909). p. 435 {— Cereus leptopMs BC. = C flagelUformis 

 leptophis Schum.). — Mexiko. 



Bergerocactas Britton and Rose gen. nov. in Contrib. U. S. National Herb. 

 Washington XII (1909). p. 435. 



A low, much-bianched, day-bloomiug cactus, with spreading or 

 ascending stout, cylindric, low-ribbed stems and branches, the areoles 

 close together, bearing many yellow acicular radiating spines, those of 

 contiguous areoles interlocking, one spine usually much longer than the 

 others; corolla short- funnelform, greenish yellow, the rather widely 

 expanding limb as long as the tube or longer; ovary densely covered 

 with areoles bearing short brownish wool and acicular spines; corolla 

 tube with a few similar distant areoles; sepals narrowly obovate, obtuse ; 

 petals obtuse, little longer than the stamens; style, including the linear 

 Stigmas, about as long as the stamens; fruit globose, denselj^ spinj^; 

 seeds obovate. 



B. Emoryi (Engelm.) Britton and Rose 1. c. p. 435 (= Cereus Emoryi Engelm. 



= Echinocereus Emoryi Rümpl.). — (California. 

 Cephalocereus aleusis (Weber) Britton and Rose in Contrib. U. S. Nat. Herb. 

 Washington XII (1909). p. 415 (= Pilocereus aleusis Weber). — Mexiko. 



C. haliamensis Britton 1. c. p. 415. — Bahamas (Britton et Millspaugh n. 2221. 



.5431, Northrop n. 699, Brace n. 5054, Wilson n. 7185, Brace n. 4695. 2051). 



C. Bakeri Britton and Rose 1. c. p. 415. — Cuba (C. F. Baker n. 2731, Wright 

 n. 2621). 



C. chrysacanthus (Weber) Britton and Rose 1. c. p. 416 (= Pilocereus chrysacanthus 

 Weber = Cereus chrysacanthus Orcutt). — Mexiko. 



C. colombianus Rose 1. c. p. 416. PI. LXH. LXIII. — Colombia (Maxon n. 3845). 



C. cometes (Scheidw.) Britton and Rose 1. c. p. 416 (= Certus cometes Scheidw. 

 = Pilocereus jubatus Salm-Dyck = Cereus flavicomus Salm-Dyck = Pilo- 

 cereus cometes Mittl. = Pilocereus flavicomus Salm-Dyck). — Potosi, Mexiko. 



