SUCCULENT PLANTS. 



459 



C. Macdonaldiac, and C. nycticalus, all with immense white flowers. 

 The "Botanical Magazine " quotes of one species : 



" Queen of the dark, whose tender glories fade 

 In the gay radiance of the noontide hour." 



Pilocercus. — This genus has been reduced to Cereus, but it may be 

 retained for P. Houletii and for P. senilis and allied plants. The latter 

 is called by Schumann Ceplialocereus. Both are natives of Mexico. 



Echinopsis. — Regarded as a section of Cereus by Hooker and 

 Bentham, this genus may also be conveniently retained for species with 

 the stem as in Echinocactus, and flowers having a long floral tube. 



Fig. 76. -Astrophytum myriostigma. 



E. Eyrie sii, with large white flowers, and E. multiplex (fig. 77), with 

 large rose flowers, are successfully grown out of doors. Both are natives 

 of Mexico. 



Echinocereus. — To include some forty species, this genus also is 

 worth keeping apart from Cereus. They appear to be clearly marked 

 off by having a prickly ovary and thick green stigma. 



Phyllocactus. — For the magnificence of its flowers this genus is 

 pre-eminent among Cactaceae, and, with the exception of EpipJiylhuu, 

 which is nearly allied, no other has been so popular within recent 

 years. Annually at the Temple Show a group of hybrids is one of 

 the fine features in the exhibits of Messrs. James Veitch of Chelsea. 

 The stems are flat, though sometimes three-angled and notched, each 

 notch representing a node. The flowers vary from yellowish white to 

 pure white, scarlet, salmon-red, pink, and yellow, often with effects to 



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