Descriptive Flora 



145 



or pinkish, with 10 lobes spreading over and above the stamens 

 in bright sunlight. Fruits large, extremely ornamental, re- 

 maining a bright scarlet for several months, and easily eclipsing 

 the blossoms in beauty. April. In dry soil. Widespread, but 

 not common. 



MamillaHa heyderi Muhlenpf. Devil's Pin Cushion. 



(Cactus heyderi [Muhlenpf.] Kuntze.) 



Plants 1 to 3" high, nearly globular, 1 to 4" in diameter, the 

 surface covered with teat-shaped, 4-angled tubercules, each of 

 which bears about 10 to 22 white, radiating bristles and a central, 

 solitary, stout, short, nearly straight spine. Flowers small, about 

 y£ across, white or tinged with violet, blossoming one to several 

 at a time between the teat-like projections near the center of the 

 crown. Rare here. Fairly common in the sandy country to the 

 south. Blossoms continuously from late February to April. 



*MamiUaria missouriensis Sweet. Devil's Fingers. Nipple Cactus. 

 (Cactus missouriensis Kuntze.) 



Cactus similar to Cactus heyderi but the tubercules are 

 fewer, cylindrical, larger, longer and coarser, and are crowned by 

 fewer (usually a dozen), longer, stouter, radiating bristles and a 

 stouter central spine about V2" long. Flowers larger, iy 2 to 2y 2 

 across, brilliant orange, similar in general appearance to the 

 blossoms of Echinocactus setispinus. These plants as well as 

 Mamilhria heyderi have the habit of drawing themselves into the 

 ground thus presenting only a very limited surface to the sun. 

 Blossoms at intervals from April to July. Very rare. 



Echinocereus caespitosus Engelm. & Gray. Classen's Cactus. 

 (Echinocereus reichenbachianus) 



Bristly spiny, cylindrical cactus, solitary or growing in 

 clumps up to 7 individuals, each 2 to 3" in diameter, 2 to 6" high. 

 Ribs 10 to 15, with a dense row of radially centered, weak, white 

 spines growing on the crest, giving the cactus a scaly appearance. 



* Possibly Mamillaria weismanii or some other species. 



