58 CACTUS CULTURE FOR AMATEURS 



unlike the teeth of a small comb. Flowers yellowish, tinged with 

 purple ; petals bright rose ; stamens yellow ; stigma large, green. 

 The form of the flowers is that of a cup, nearly 3 inches across. 

 Mexico, 1845. It requires warm-house treatment. 



Tig. 27. Echlnocactus myriostigma. 



fi. polyancistrus. 



Stem light green, ovate or cylindrical, 4 to 10 inches 

 high, 3 inches in diameter. Ribs thirteen to seventeen, inter- 

 rupted, and bearing tufts of about twenty radial white spines, 

 1 to 2 inches long, and about a dozen central spines, from 1 to 



