white; but the principal difference is that the flowers of 

 the latter are, for the most part, nearly sessile, being em- 

 bosomed in an involucrum of leaves, whereas those of A. 

 albiflora are on nearly naked peduncles. 



Although native of a tropical climate, like Argemone 

 mexicana, it may be considered as a hardy annual as it 

 readily ripens its seeds in the open air. 



