THE BABY CACTUS 57 



water to moisten the soil well once in two or three weeks 

 during dry months. 



Snowball Pincushion (Mammillaria Olivia) 



(Named Olivia in honor of Mrs. C. R. Orcutt, who shared 

 her husband's interest in these plants) 



How to identify and how it grows 



The Snowball Pincushion is covered with a dense coat of 

 white spines, looking much like a snowball lying on the 

 ground. It grows on solitary stems or in some instances 

 in clumps, is globose, and has twenty-five to thirty-five thorns. 

 The plant is covered with radially placed spines about half 

 an inch long, translucent white and somewhat twisted. There 

 are four centrals in the spine groups. The flowers of this 

 plant resemble those of the Sunset Cactus, and are pink and 

 pink-rose with the margins fringed in white. They are 

 very showy and about an inch long. The pink flowers con- 

 trast well with the glistening white spines, making this cactus 

 one of the handsomest of its kind, growing on the deserts and 

 foothills of southern Arizona. 



How to grow 



The same care and treatment is suggested as for the Sun- 

 set Cactus. 



Green Flowered Pincushion (Mammillaria 



viridiflora) 



(Named from its green flowers, which are very uncommon 



among cacti) 



How to identify and how it grows 



The Green Flowered Pincushion Cactus grows from single 

 stems or in small clusters and is cylindrical or globose. The 



