HYLOCEREUS. 



193 



Salm-Dyck (Cact. Hort. Dyck. 1849. 220. 1850) described C. triangularis uhdeanus, 

 based upon a cultivated Mexican plant. It is described with 4 to 6 radial spines and i 

 central, yellow, minute. Salm-Dyck was uncertain whether it was a garden variety or a 

 distinct species. 



Cereus aiiizogonns Salm-Dyck (Cact. Hort. Dyck. 1849. 52. 1850) was given as a 

 synonym of Cereus triangularis. 



Miller, who first published Cereus comprcssus distinguished it from C. triangularis, 

 but based it upon Plukenet's illustration (Opera Bot. i : pi. 29, f. 3), which Linnaeus referred 

 to Cactus triangularis, and which we believe represents the Jamaican plant. Martyn 

 in a later edition of Miller's Gardeners' Dictionary refers Miller's Cereus compressus to 

 Cactus pentagonus (?), which seems hardly correct. The Index Kewensis refers Cereus 

 compressus to Mexico. Cephalocereus compressus (Monatsschr. Kakteenk. Index, vol. i to 

 20. 36. 1912) belongs here. 



Illustrations: Plukenet, Opera Bot. i: pi. 29, f. 3, as Cereus erectus cristatus; Bradley, 

 Hist. Succ. PI. ed. 2. pi. 3, as Ccrcns americanus triangularis etc. 



Figure 269 shows a joint of a plant collected by Dr. Britton near Mandeville, Jamaica, 

 in 1907. 



FIG. 269. Joint of Hylocereus triangularis. Xo.5. 



16. Hylocereus antiguensis sp. nov. 



Stems high-clambering, forming great masses in the crotches of high trees or covering the 

 tops of low trees; joints 2 to 4 cm. thick, 3-angled, rarely 4-angled; margins of ribs not horny, hardly 

 undulate; areoles 2.5 to 3.5 cm. apart; principal spines 2 to 4, about 6 mm. long or less, accessory 

 ones or bristles 2 to 5; flowers 14 cm. long; outer perianth-segments linear; inner perianth-segments 

 yellow, at least drying so, broader than the outer segments; flower-tube bearing linear acute scales. 



This species is nearest H. trigonus, but the margins of the ribs are very different. The 

 description is based on specimens collected by Dr. Rose in Antigua (No. 3297), of which 

 we have both living and herbarium specimens. It flowered in the New York Botanical 

 Garden in 1916. 



Figure 270 is from a photograph taken by Paul G. Russell on Antigua in 1913. 



17. Hylocereus calcaratus (Weber) Britton and Rose, Contr. U. S. Nat. Herb. 12: 428. 1909. 



Cereus calcaratus Weber, Bull. Mus. Hist. Nat. Paris 8: 458. 1902. 



A climbing vine, the joints 4 to 6 cm. wide, strongly 3-winged, green, the margin divided into 

 numerous prominent lobes; areoles small, from the upper angles of the marginal lobes, spineless but 

 bearing 2 to 4 small, white bristles. 



Type locality: Port Limon, Costa Rica. 



Distribution: Costa Rica. 



Neither flowers nor fruit were known to Dr. Weber when he described the plant; we 

 have had it for a number of years and it has not yet flowered with us. It is very unlike the 

 other species of Hylocereus, having very peculiar stems and no spines, and it may not be 

 of this genus. 



Figure 271 shows a joint of a plant, which was obtained by W. R. Maxon, in cultiva- 

 tion at San Jose, Costa Rica, in 1906. 



