292 CACTACEAE. 



1. Cephalocereus Millspaughii Britton, Contr. U. S. Nat. Herb. 12: 417. 1909. 



Stem branched, 2-6 m. high, 20 cm. thick at the base, the branches nearly 

 erect, 8-12 cm. thick, pale grayish green, pruinose, 8-13-ribbed, the ribs 

 acutish, about as wide as high or a little wider; areoles 1-2 cm. apart; spines 

 about 20, acicular, widely radiating, 1-2 cm. long, or at the flower-bearing 

 (upper) areoles 3-7 cm. long, the old ones gray brown, the young ones yellow 

 or yellow-brown, with darker bases; upper areoles on one side of the plant 

 with large tufts of whitish wool often as long as the spines or longer; flow- 

 ers 6 em. long. 



Rocky hillsides, coppices and thickets, Cave Cay, Cat Island, Conception Island, 

 Watling's, Acklin's, Mai-iguana, Long Island, Caicos Islands, Cotton, Salt and 

 Ambergris Cays, and Little Inagua : Cuban Cays. Recorded by Dolley and by 

 Hitchcock as Cereus Swartsii Griseb. ; by Coker as Pilocerus lanuyinosus. MILLS- 

 PAL-GH'S DILDO. WILD FIG. OLD MAX CACTUS. 



2. Cephalocereus bahamensis Britton, Contr. U. S. Nat. Herb. 12: 415. 1909. 



Plant 3-4 m. high, often 20 cm. thick at the base, the branches divergent- 

 ascending, 7-9 cm. thick, dull green, not pruinose, 10- or 11-ribbed, the ribs 

 blunt or acutish, rather higher than wide; areoles 11.5 cm. apart; spines 15- 

 20, acicular, radiately spreading and ascending, gray-brown to yellow-brown 

 when old, 1-1.5 cm. long, the young ones yellowish with darker bases, the 

 uppermost 2.5-3 cm. long; wool very short (shorter than the spines), or none; 

 flower 5-6 cm. long, brownish outside, the petals creamy-white. 



Rocky hillsides, Frozen Cay, Andros, Eleuthera, and Crooked Island. Endemic. 

 Recorded by Mrs. Northop as Cereus Sicartzii Griseb. BAHAMA DILDO. 



2. HARKISIA Britton, Bull. Torr. Club 35: 561. 1908. 



Night-flowering cacti, mostly with upright branched cylindric stems, the 

 branches fluted, with from 8-10 rounded ribs, separated by shallow grooves 

 and bearing leafless areoles at frequent intervals, each areole with acicular 

 spines. Flowers borne singly, at areoles near the ends of the branches, funnel- 

 form, large, with a cylindric scaly but spineless tube as long as the limb or 

 longer; buds globose, ovoid, or obovoid, densely scaled, the scales subtending 

 long or short woolly hairs ; sepals pink or greenish, linear-lanceolate ; petals 

 white; stamens shorter than the petals; style somewhat longer than the sta- 

 mens; fruit globose to ovoid-globose, green to yellow, tubercled or becoming 

 smooth, spineless, with mostly deciduous scales; corolla withering-persistent; 

 seeds very numerous, small. [In honor of William Harris, Superintendent of 

 Public Gardens and Plantations of Jamaica, distinguished for his contribu- 

 tions to the knowledge of the flora of that island.] About 8 species, natives 

 of Florida and tropical America. Type species: Cereus gracilis Mill. 



1. Harrisia Brookii Britton, Bull. Torr. Club 35: 564. 1908. 



Plant 5 m. high, much branched, light green; branches 3-4 cm. thick, 

 10-ribbed, the ribs sometimes prominent; with deep depressions between them. 

 Areoles about 2 cm. apart; spines 6-12, the longer ones 2-2.5 cm. long; bud 

 ovoid, prominently long-pointed, its scales with few curled white hairs 7-10 

 mm. long; fruit yellowish, subglobose or ellipsoid, about 8 cm. in diameter, 

 rounded at both ends, or narrowed above, the tubercles very low, with tips only 

 1.5 mm. high, the linear scales persistent. 



Scrub-lards, Long Island at Clarence Town. Endemic. Recorded by Dolley 

 as Ccrciix n /Hindus Haw, and also as Cereus pcUucidus (presumably). Named in 

 honor of Herbert M. Brook, for many years Registrar of the Bahamas, who greatly 

 facilitated our explorations. At the place of publication Clarence Town was inad- 

 vertently printed George Town. BROOK'S DILDO. 



