MAMZLLARZA. 83 



and also by having no central or hooked spines. Flowers small, 



white, with pink stripes. One of the most attractive of the small 



Mamillarias. Texas, Arizona, &c. Var. plumoxa has longer 



spines, more distinctly feathered. Var. deniidata has unfeathcrcd 



spines. 



M. longimamma. 



8 tern seldom more than 4 inches high, branching at the 

 base when old. The tubercles at least 1 inch long, terete, slightly 

 curved, and narrowed to a pointed apex, the texture being very soft 



Fig. 4O. Mamillaria longimamma. 



and watery. Each tubercle bears a radiating tuft of about twelve 

 spines, one central and projecting outwards ; they are white when 

 young, A tuft of short, white wool is developed at the base of the 

 spines on the young mammae. Flowers large and handsome, citron- 



G 2 



