A SOUTHWESTERN PLANT GROUP. 



795 



Northern flora. The gorgeous yellow of Opuntia Rafinesquii 

 and O. Missouriensis, flourishing on a sandy hillside beneath 

 the July sun, can well inspire the soul of botanist and flower- 



Fio. 6. YUCCA GLORIOSA. 



lover. It is an interesting and significant fact that among the 

 Rotatm, as allies of the Opuntia, we find the two little genera that 



