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JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



belongs to a group with a double corona, and is distinguished from its 

 allies, like Duvalia and Huemia, which are sometimes included within 

 it, by having a rotate or reflexed corolla. One of the finest is S. gigantea 

 (" Bot. Mag.," t. 7068), a native of Zululand (fig. 85). It is curious that 

 this and other largest flowers of the vegetable kingdom should be lurid in 

 colour and of unpleasant odour. A selection might include : S. clypeata ; 

 S. conspurcata; S. deflexa ("Bot. Mag.," t. 1890) ; S. grandiflora ("Bot. 

 Mag.," t. 585); S. mutabilis ("Jacq. Stapel.," t. 42); S. olivacea 

 ("Bot. Mag.," t. 6212); S. pahda; S. picta ("Bot. Mag.," t. 1169); 

 S. Plantii (" Bot. Mag.," t. 5692) ; S. sanguinea ; S. trisulca ; S. varicgata. 

 Euphorbiaceae. 



Euphorbia. — A highly interesting genus known widely over the 

 world, and, while represented in Britain by annual and perennial herbs, 



Fig. 86. — Mimicry in Euphorbia and Cebeus. (1) Cereus sr.; (2) Euphorbia 

 ahyssinica; (3) C. Spachianus ; (4) C. Forbesii ; (5) E. polygona; (G) E. canariensis. 



in South Africa it becomes succulent, frequently frutescent, and often 

 shaped like a cactus. The sap is always milky, but never so in a cactus. 

 The following are interesting species for cultivation: E. buplcurifolia; 

 E. Caput- Medusae ; E. globosa ("Bot. Mag.," t. 2624); E. grandidens; 

 E. mam 'dlaris (fig. 87) ; E. mcloformis ; E. pentagona ; E. polygona 

 (fig. 86) ; E. procumbens (" Bot. Mag.," t. 8082) ; E. virosa (coerulesccns, 

 Haw.). The well-known E. Bojeri ("Bot. Mag.," t. 3527), E. splendens 

 ("Bot. Mag.," t. 2902), E. xylophylloides and others are natives of 

 Madagascar. 



