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REVISION OF THE GENUS CERE US MILL. 69 



Cereus (Eulychnia) acidus K. Sch. 1. c. Nachtr. 22. — Chile. 



4 



C. (Eulychnia ?) aureus K. Sch. I.e. 124. — Peru. 



C. (Enlychnia) breviflorus K. Sch. 1. c. 58. Nachtr. 23. — Chile. 



C. {Enlychnia) castaneus K. Sch. 1. c. Nachtr. 22. — Chile. 



C. (Enlychnia) Dusenii Web. Monatsschrift f. K. 1904: G8. — Pata- 

 gonia. 



C. (Enlychnia) erythrocephalus (K. Sch.) A. Berg. 1. c. 195. — Argen- 

 tina. 



C. (Eulychnia) hypogaeus Web. 1. c. 289. Nachtr. 38. — Chile. 



C. (Eulychnia) iquiquensis K. Sch. Monatsschrift f. K. 1904: 99. 



Chile. 



C. (Eulychnia?) macrostibas (K. Sch.) A. Berg. Monatsschrift f. K 



1903: 1G8. — Peru. 



C. (Eulychnia) melanotrichus K. Sch. 1. c. 71. — Bolivia. 



C. (Eulychnia) patagonicus Web. 1. c. Nachtr. 61. — Patagonia. 



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IX. PILOCEREUS A. Ber S . 



Flowers short and campanulate, of a dull color and disagreeable 

 smell; ovary and tube nearly naked or with a very few scales; sepaloid 

 and petaloid perianth leaves short, little expanded ; stamens numerous, 

 inserted along the tube, as long as the perianth; style very often much 

 exserted, rarely not exceeding the perianth, with 5-10 or more short 

 stigmata. Fruit globular, naked, crowned by the dried remains of the 

 flower. — Plate 4,f. 2-5. 





The 



Ce 



phalocereus. These were separated by Schumann, whilst 

 Pilocereus was made the recipient of any strange-looking 

 C evens i especially of those with hairy areoles. By de- 

 grees Pilocereus has become a very heterogeneous and 



senseless genus. 



I maintain the name, as it is so much in vogue among 

 cactus growers, for those species having the characters 

 above given. In this way the subgenus becomes a very 



natural one. 



Most of these species have hairy areoles, and sometimes 



hairs of a beautiful silky white. Frequently the flowers 



are surrounded by a great brush-like profusion of such 



hairs. In some species the flowers are produced from one 



side of the stem only, and so the appearance of a cepha- 



lium is presented. 



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