ACCOUNT OF GENUS SEDUM AS FOUND IN CULTIVATION. II 



The correlation of the Mexican Sedums with those of the Old 

 World presents difficulties. The shrubby species appear best placed 

 in the Seda Genuina, with which they possess many connecting links. 

 To accommodate another characteristic Mexican group a new section, 

 Mexicana, has been instituted. 



Literature. — Britton and Rose, " Crassulaceae," in "North 

 American Flora," 22, Part I., 1905, and subsequent papers, mostly 

 by J. N. Rose, in " Contributions from the U.S. National Herbarium," 

 and elsewhere. 



Central and South America. 



A few species, of no importance horticulturally, occur in Guatemala, 

 to the south of the great Sedum-centre of Mexico. Farther south, 

 we find that the genus has in old days spread along the great back- 

 bone of America, and makes on the Andes its only appearance in the 

 Southern Hemisphere,* a few species being found as far south as Peru, 

 and one as Bolivia. 



IV. Statistical. 



From the point of view of the gardener anxious to identify a 

 Sedum which is unknown to him, the bringing together, as in the 

 present paper, of all the species in cultivation, instead of helping him, 

 may tend to have the opposite effect, since the comparatively small 

 number of more or less common species (to one of which his plant 

 probably belongs) is buried among a complex of other rarer plants 

 which he is unlikely to encounter. With a view of mitigating this 

 difficulty, I attempt below to indicate the species of most frequent 

 occurrence, and also those at the other end of the scale, thus : 



Species very common in Cultivation. 



acre rupestre spurium 



album sexangulare Telephium 



reflexum 



It is probably no exaggeration to say that out of every ten plants 

 (of Sedum) found in British gardens, nine belong to one or other of 

 these species ; and, furthermore, that of every ten names apphed in 

 British gardens to Sedums, five refer to one or other of the seven 

 species above. 



Species common in Cultivation. 



Aizoon hyhridum oreganum 



altissimum kamischaticum roseum 



Anacampseros maximum spectabile 

 anopetalum 



* It just reaches the Equator in Africa (see p. 6). 



