294 CACTACEAE. 



and 3 cm. wide; wool of the areoles of ovary and flower-tube brown, silky; 

 style greenish; ovary strongly tubercled; fruit globose, 5-6 cm. in diameter. 



On walls, persistent or spontaneous after cultivation, New Providence : Cuba ; 

 Hispaniola ; east coast of Mexico. QOEEN-OF-THE-XIGHT. 



2. Selenicereus grandiflorus (L.) Britton & Kose, Contr. U. S. Xat. Herb. 12: 

 430. 1909. 



Cactus grandiflorus L. Sp. PI. 467. 1753. 



Cereus grandiflorus Mill. Gard. Diet. ed. 8, no. 11. 1768. 



Stems light green, but often becoming deep purple, up to 3 cm. in diameter 

 ribs 4-8, rather prominent but less so on the older branches ; areoles small, 

 white; spines acicular, 1 cm. long or less, yellowish; deflexed bristles or hairs 

 from the lower part of the areoles several, white, often longer than the spines; 

 flowers 2 dm. long; outer perianth-segments and scales of the tube linear, 

 greenish or brownish, sometimes nearly rose-colored; inner perianth-segments 

 acute, rather broad; style cream-colored, stout; areoles of ovary and flower- 

 tube bearing short wool and long silky whitish hairs and white bristles; ovary 

 tubercled ; fruit ovoid, about 8 cm. long. 



Thickets, Cave Cay, persistent after cultivation : Cuba ; Jamaica. QUEEN-OF- 

 Often cultivated. 



5. CACTUS L. Sp. PL 466. 1753. 



Subglobose ovoid or short-cylindric, ribbed leafless cacti, the spine- 

 bearing areoles borne on the ribs, the flowering areoles confluent into a term- 

 inal, densely woolly and bristly cephalium. Flowers with a cylindric tube, 

 sometimes enlarged at the base, the limb several-many-lobecl, the lobes imbri- 

 cated. Stamens several or numerous, the filaments capillary, the anthers 

 oblong. Ovary smooth; style filiform; stigma-rays few or many; ovules many. 

 Fruit an obovoid or subclavate, fleshy and juicy berry, at length protruded 

 from the cephalium, ci owned by the withering perianth. Seeds many, small, 

 black, without endosperm. About 20 species, natives of tropical America. 

 Type species: Cactus Melocactus L. 



1. Cactus intortus Mill. Gard. Diet. ed. 8, no. 2. 1768. 



Plant depressed-globose when young, when old ovoid, 3-4 dm. high and 

 often 3 dm. in diameter, rather light dull green, 15-20-ribbed, the ribs 2-4 cm. 

 high, crenate, the areoles bearing 7-13, stout subulate spines 1.5-4 cm. long; 

 cephalium at first nearly flat, at length cylindric, about 10 cm. in diameter, 

 sometimes 3 dm. high, densely white-woolly and brown-bristly ; flowers pink 

 or rose, 1-1.6 cm. long; inner perianth-segmerts acute or cuspidate; fruit red 

 or rose, narrowly obovoid, 2-2.5 cm. long. 



Rocky soil. Long Island, Acklin's Island, Marigunna. East and South Caicos, 

 Turks Islands. Eastern Cay, Cotton Cay. Ambergris Cay, Little Inagua and Inagua : 

 Mona to Virgin Gorda and Antigua. Recorded by Dolley as Melocactus coin munis 



DC. TtJHK'S-CAP. 



6. CORYPHANTHA Lemaire, Cact. 32. 1S68. 

 [MAMMILLARIA Haw. Syn. PL 'Succ. 177. 1812. Not Stackh. 1809.] 



Stems globose or ovoid, tubercled. Tubercles conic or cylindric, woolly and 

 with clusters of spines at the apex. Leaves none. Flowers borne in areolae 

 at the bases of the tubercles. Calyx-tube prolonged beyond the ovary, which 



