ACCOUNT OF GENUS SEDUM AS FOUND IN CULTIVATION. 7 
white flowers ; stoloniferum is less frequently seen in gardens, and 
Stevenianum and proponticum almost unknown. The remaining 
members of the group, ohtusifoUum, Millii, and involucrahim, from 
the Caucasus, and Baileyi from China, are not, I believe, in cultivation. 
The Sempervivoides group includes two remarkable biennial plants, 
5. sempervivoides and 5. pilosum, which form dense plump leaf-rosettes 
like those of the genus Sempervivum, and in their second year produce 
masses of showy red flowers. Both species are now well known in 
good collections. For the rest, the Sedums of the Caucasus region, 
which number some twenty in all, include a few familiar European 
species — maximum, album, acre, sexangulare — a few small perennials 
not found elsewhere — gracile, tenellum, and suhulatum, the first of 
which is in cultivation — and some little annual species. 
Literature. — Lipsky, "Flora Caucasica," 1899 (in Russian). 
Hamet, " Revision des Sedums du Caucase." Trd. Bot. Sada, Tiflis, 
8, Part III., 1908. 
Note. — Syria, Mesopotamia, and Persia yield a number of Sedums, 
mostly small annuals. 
Siberia and Central Asia. 
Just as the Caucasus region is the headquarters of the small and 
distinct group of Sedums of which the familiar spurium is typical, so 
we find focussed in Eastern Siberia and the northern parts of China 
and Japan a compact little group of thick-rooted, flat-leaved, yellow- 
flowered species — the Aizoon group. These include five — Aizoon, 
Selskyanum, hybridum, kamtschaticum, and Middendorffianum — of 
which the first and third were known to Linnaeus, and all have been 
long in cultivation ; and the two more, Ellacombianum and floriferum, 
lately described by myself from living material. Only two of the 
group are not in cultivation — 5. Sikokianum and S. Yabeanum, both 
of Japan. For the rest, the Siberian and Central Asiatic Sedum flora 
is made up mainly of plants of the Rhodiola and Telephium sections, 
many of which occur, some of them extending far to the northward. 
But the main centre of the Rhodiola section lies farther south, in the 
Himalayan region, and that of the Telephiums south-eastward, in 
China and Japan. 
Literature. — Maximowicz, ''Diagnoses Plantarum Novarum 
Asiaticarum." Bull. Acad. ImpSr. des Sciences de St. Petersbourg, 
29, 1883, (Reprinted in Melanges Biologiques, 11.) 
The Himalayan Region. 
The Himalayas are par excellence the headquarters of the Rhodiola 
section of Sedum ; not that many species of that group are not found 
in neighbouring regions — e.g. Yunnan — but in the Himalayas the 
Rhodiolas are so abundant as to form a feature of the vegetation of 
the higher grounds, and only few other Sedums occur, while in Yunnan 
many other species are found. A good many of the earlier discovered 
