the perianth more revolute, and the stamens distinctly 

 exserted; all of which may, perhaps, be accounted for by 

 the advanced stage of the inflorescence. But the South 

 African species of Cotyledon are generally badly defined, 

 as is fully exemplified by Baker and Schonland's paper 

 in the Journal of Botany, cited above ; the one working 

 with the advantage of Haworth's types before him, and 

 the other in South Africa with living plants under 

 observation, they were still unable to define the limits 

 of the species allied to C. orbiculata, LindL, and could 

 only suggest, in many instances, that certain specimens 

 and figures represented the same species. 



Haworth cites, in the first instance, Burman's Cotyledon 

 foliis latis sinuosis, &c. (Rariorum Jfricanarum Plantarum 

 Decades, p. 44, t. 19, fig. 2) as synonymous with his 

 C. undulata; but he subsequently cited it with the sign of 

 interrogation. Lamarck (Encycl. vol. ii. p. 142) founded 

 his C. mucronata on the same figure. Schonland and 

 Baker, Jun. (Journ. Bot. 1902, p. 15), regard C. mucronata as 

 distinct from. 0. undulata, and describe a specimen from 

 Graaf Reinet as belonging to the former. Burman's 

 figure was evidently drawn from a plant bearing an in- 

 florescence in a very advanced stage ; but I think myself, 

 judging from the variation in the colour and position of 

 the flowers at different stages of development, that 

 C. undulata and C. mucronata may be the same. 



C. orbiculata was figured in the Magazine (t. 321) as 

 long ago as 1795, and it is recorded by Aiton (Hort. Kew. 

 ed. 1, vol. ii. p. 106) as having been introduced by a Mr. 

 Bentick in 1690. 



A century ago these showy and easily cultivated suc- 

 culent shrubs were much in favour, and they certainly 

 deserve more attention than they get at the present time. 

 Curtis wrote of C. orbiculata that it flowered freely and 

 grew rapidly. 



Our plate was prepared from a specimen received from 

 Mr. R. I. Lynch, Curator of the Cambridge Botanic 

 Garden. 



It may be added that C. gibbiflora, Moc. & Sesse, a 

 Mexican species of the section Echeveria, having foliage 

 similar to that of our plant, is sometimes met with under 

 the name of C. undulata. 



