208 



THE CACTACEAE. 



acicular 



spines but no hairs. 



Type locality: La 



ovary 



I cm. long or less and each 

 clusters of brown acicular 



Colombia 



Flower description drawn from flower open! 

 June 1917, on specimen obtained from M. Simon 



York Botanical Garden in 



KiG. 287. — Joint of Selenicereus inermis. X0.5. 



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Hermann Karsten from Colombia and was described 



near Ccrcus inermis, but twice as slender. We 

 esneciallv in cultivation, becomes elongated and 



Jar din 



Dr. Rose found specimens labeled Cercus karstenii which proved to be only slender forms 

 of S. inermis. In 1916 Dr. Rose collected 5. inermis at its type locality and obtained fruit 



1849. 5^' 



>t time 

 name. 



Salm-Dvck (Cact. Hort 



Figure 287 shows a joint of a plant collected by Dr. Rose between Caracas 

 Guayra, Venezuela, in 191 6. 



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Fig. 288.— Branches of Selenicereus wercklei. Xo.66. 



icereus wercklei (Weber). 



Cereus wercklei Weber, Bull. Mus. Hist. Nat. Paris 8: 460. 



iyo2 



growth 



knobs at the areoles tipped by small red scale-like leaves ; branches pale greenf 5 to 15^ in diameter 







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