io8 



THE CACTACEAE. 



Fig. 159. — Flower of B. emoryi 



The genus is monotypic; it is named in honor of Alwin Berger, author of an excellent 

 discussion of the genus Cereus, who was long in charge of the garden of Sir Thomas Hanbury 

 at La Mortola, Italy. 



1. Bergerocactus emoryi (Engelmann) Britton and Rose, Contr. U. S. Nat. Herb. 12:435,* 474. 

 1909. 



Cereus emoryi Engelmann, Amer. Journ. Sci. II. 14: 338. 1852. 

 Echinocereus emoryi Riimpler in Forster, Handb. Cad:, ed. 2. 804. 1885. 



Branches 2 to 6 dm. long, 3 to 6 cm. in diameter, entirely covered with the dense spiny arma- 

 ment; ribs 20 to 25, very low, only a few millimeters high, somewhat tuberculate; spines 10 to 30, 

 yellow to yellowish brown, acicular, 1 to 4 cm. long; flowers about 2 cm. long and about as broad 

 when expanded; outer perianth-segments obovate, obtuse; inner perianth-segments oblong, about 

 1 cm. long. 



Type locality: "About the boundary line" of 

 California and Lower California. 



Distribution: Near the coast of southwestern 

 California and northwestern Lower California and 

 adjacent islands. 



Illustration: Engelmann, Cact. Mex. Bound, pi. 

 60, f. 1 to 4, as Cereus emoryi. 



Figure 158 is from a photograph taken by E. 



0. Wooton on San Clemente Island, California, in 

 191 2; figure 159 shows a dried flower collected by 

 Le Roy Abrams at Tia Juana, San Diego County, California, in 1903. 



15. LEOCEREUS gen. nov. 



Stems long and slender, nearly terete, somewhat vine-like in habit; ribs numerous, but low and 

 indistinct; areoles approximate, bearing acicular spines and felt, but no wool or hairs; flowers 

 axillary, solitary, small, narrowly campanulate, with a short limb ; ovary and flower-tube very scaly, 

 the scales bearing numerous silky hairs and bristly spines in their axils; fruit small, globular; seeds 

 black, shining, pitted. 



In its narrow flower, in the hairs in axils of the scales on the ovary and tube, this genus 

 suggests Oreocereus, but is very different in habit. The flower of Leocereus is different from 

 that of Nyctocereus in its narrow throat, short perianth-segments, hairy and bristly areoles. 



The genus is named for Seflor A. Pacheco Leao, Director, Jardim Botanico, Rio de 

 Janeiro, Brazil. The first of the 3 species here described is taken as the type. 



Key to Species. 



Flowers 4 cm. long; spines yellowish brown 1. L. bahiensis 



Flowers 6 to 7 cm. long; spines dark chestnut-brown. 



Axils of scales on ovary densely lanate; fruit villous 2. L. melanurus 



Axils of scales on ovary sparsely lanate; fruit nearly naked 3. L. glaziovii 



1. Leocereus bahiensis sp. nov. 



Somewhat branched, sometimes erect, sometimes clambering, up to 2 meters long, 1 to 1.5 

 cm. in diameter; ribs 12 to 14, low; areoles close together, circular, bearing white felt and spines; 

 spines numerous, the central ones much longer than the radials, often 3 cm. long, acicular, yellowish, 

 spreading; flowers 4 cm. long, densely woolly and spiny; inner perianth-segments small, white; fruit 

 10 to 12 mm. in diameter; seeds 1.5 mm. long. 



Living and dried flowers of this species were obtained from the Horto Florestal, 

 Joazeiro, Brazil, through Dr. L. Zehntner (No. 266, type) ; later Dr. Rose obtained more 

 material at Barrinha, Bahia, Brazil, and living plants were sent to the New York Botanical 

 Garden; in October 191 7 Dr. Zehntner obtained fruit in the Chique-Chique district of Bahia. 



*By typographical error Bergcrocereus. 



