ON CACTI AND OTHER SUCCULENTS. 



795 



spines, the ridges are very deep, regular, and smooth, and it 

 is beautifully dotted with white spots composed of minute hairs 

 (Fig. 530). E. scopa has a brush-like appearance, being covered 

 with bristle -like 

 spines, in tufts. 

 The crested form 

 {cristata) is most 

 peculiar, much 

 resembling i n 

 form a cock's- 

 comb. Other in- 

 teresting species 

 are : E. Simpsoni, 

 E. turbiniformis 

 (the Pinwheel), 

 E. viridescens, 

 E. Wislizeni, E. 

 Ottonis, E. electra- 

 canthus, and E. 

 horizonthalonis. 



Echinopsis are 

 also warm-house 

 Cacti, but they 

 require to be kept 

 dry in winter. 

 They are globular 

 in form, and are 

 covered with stiff 

 spines. Sorts: 

 E. cristata has a 

 globular stem, 

 with deep star 

 ridges ; it is a 

 very fine species, 

 possessing large 

 white flowers. 

 E. Eyriesii is re- 

 markable for its 



immense flowers in comparison with the size of the plant, which is 

 small, with sharp ridges, tufts of fine white hairs, and red spines ; 

 the flower is pure? white and expands at night, and, when in 

 bud, is covered with greyish-black hairs ; it also has a very 

 delicate scent. The double form, E. E. flore-pleno (Fig. 531), 

 is even more remarkable. E. Pentlandi is only 3m. in diameter, 

 but also has a large flower, of a bright red colour ; three 

 or four flowers will sometimes open together on one plant. 

 Its variety, longispinus, is remarkable on account of its long 

 spines. Other kinds are E. multiplex, E. Mulleri, and E. tubiflorus. 



FIG. 530. — ECHINOCACTUS MYKIOSTIGMA. 



