115 



CACTUS CULTURE FOR AMATfiUBS. 



smooth, scarlet, with tufts of bristles all over it. Mexico. An 

 interesting pofr plant, which should be grown in a warm greenhouse. 



O. horrida. 



Stems erect, stout, with flattened, green joints, about 5 inches 

 long by 3 inches wide. Cushions 1 inch apart, composed of short, 

 reddish bristles, and long, tawny red spines, about eight in each 

 cushion, and of a peculiarly ferocious appearance hence the 

 specific name. Mexico. Requires warm-house treatment. 



Fig. 58. Opuntia fllipendula. 

 O. hystrlclna. 



Stems tufted in habit, the joints 3 to 4 inches long and broad ; 

 cushions \ inch apart, rather large, with numerous spines, varying 

 in length from | to 4 inches, and short, yellowish bristles. Flowers 

 large, yellow. Fruit 1 inch long, spiny. San Francisco. Probably 

 hardy in this country. 



O. invicta. 



A low branching plant, with joints 4 inches long and 3 inches 

 thick, with star-like tufts of about twenty flattened spines, the 

 stoutest 2 inches long. Flowers yellow, abundant, 2 inches across ; 



