ACCOUNT OF GENUS SEDUM AS FOUND IN CULTIVATION. 9 



30 A few of these, such as Aizoon and kamtschaiicum, are plants 

 which have their headquarters in Siberia ; two others, Tehphium 

 and roseum (which occurs in the var. Tachiroi), have a much wider 

 range • but the majority are endemic. A few of them, such as 

 alboroseum, SiehoUii, and sfectaUle, have long been known m cultiva- 

 tion the last two being among the handsomest of the garden Sedums. 

 To the Telephium section belongs nearly one-half of the species 

 represented in the Japanese flora, while an equal number belongs 

 to the Japonica section, which consists mostly of smalUsh plants with 

 yellow flowers. Of the latter, a ternate-leaved species. S. hneare, 

 is in cultivation in our gardens, and two others, japonicum var. 

 senanense and Zentaro-TasUroi, are reported as in cultivation m 

 Japan. Of the whole Japanese Sedum flora, one-half is known m 



gardens. . „ 



Literature.— Matsumura, "Index Plantarum Japomcarum, 2, 



Part II., 1912. Maximowicz, " Diagnoses Plantarum Novarum Asiati- 



carum "' v., in Bull. Acad. Imp. des Sciences de St. Peiersbourg, 29 



(reprinted 'in Melanges Biologiques, 11), 1884. Making, various 



papers in Boi. Mag., Tokio, &c. 



Note.— Formosa yields half a dozen Sedums, and the Philippines 



several. One of the former, S. formosanum, is included in the present 



paper. 



The United States and Canada. 



Sedums are widely scattered throughout North America, but a 

 larger number is found in the mountainous regions of the west than 

 in the east. Two widespread species, ternatum and pulchellum, 

 long grown in European gardens, were described by Michaux in his 

 "Flora Boreali- Americana" as early as 1803. Another plant found 

 in the Eastern States, Nevii, is also long known in British gardens. 

 From the Western States have come two pretty species, spathulifolium 

 and oreganum ; also two reflexum-like plants of less merit, Douglasii 

 and stenopetalum, and the tall and handsome rhodanthum. Many 

 species found in the Western States do not appear to be anywhere 

 in cultivation, and my efforts to procure them have had only a hmited 

 success. The polymorphic Rose-root. S. rosetim, which has a circum- 

 polar range, is by American botanists restored to its place as a separate 

 genus (Rhodiola) ; it spreads in varying form along the western moun- 

 tains, and has been spHt up into half a dozen species. Except for 

 S. roseum s.s. sent me from Washington. I cannot find that any of the 

 American Rhodiola forms are in cultivation. Altogether about 

 50 species of Sedum (including some of the " split " genera) occur 

 in the States, mostly in the south-western portion. Two European 

 species, annuum and villosum, range in the native state west to Green- 

 land, and are thus included also in the American flora. Several 

 familiar Old World kinds— acr^. reflexum, spurium, and Telephium 

 subsp. Fabaria—are naturalized and run wild in the Eastern States. 



