Mr. Watson informs me that the species of Echiiiocereus, 

 even if grown in full sunshine, very rarely flower under 

 cultivation at Kew, though they grow freely. That here 

 figured was kept dry for nearly half the year. — J. D. H. 



Fig. 1, Pulvillus and spores ; 2, calyx segments ; 3, stamen ; 4, stigma : — 

 all enlarged. 



