22 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
western United States. American botanists have created a number 
of new genera for the reception of these, but they do not appear to be 
generically distinct in the accepted sense, nor does this tend to faciUtate 
their determination or the understanding of their relationships ; and 
I have retained some of them {Cremnophila, Clementsia, Sedasirum, 
Gormania) in Sedum, under which genus they were first described. 
Some of the others (e.g. Altamiranoa, Dudley a, Stylophyllum, Villadia) 
appear best placed in Cotyledon. 
Other generic names now included in the genus Sedum Sire'Rhodiola 
L. (now section Rhodiola) ; Anacampseros Tournefort (now section 
Telephium) ; Procrassula Grisebach (— Aithales Webb. & Berth), a 
small 5-stamened group included below in section Epeteium ; Telmissa 
Fenzl, characterized by being one-seeded, but closely approached 
in this respect by a few other species. 
The genus includes some well-marked groups, and others of less 
definite boundaries ; these groups being founded mainly on general 
Fig. 3. — Floral Diagram of Sedum (after De Candolle), 
growth-form. In the ensuing pages the generic subdivisions used, 
and their definitions, are as follows : 
Section 1. Rhodiola ScopoU (char, amplific). — Perennial. Root- 
stock fleshy, crowned with leaves with a broad clasping base (often 
reduced to membranous deltoid or semi-orbicular scales, or becoming 
so with age), from the axils of which annual leafy flowering shoots 
are produced. Flowers 4- or 5-parted, dioecious or hermaphrodite. 
Hardy plants, mostly Asiatic. (P. 26.) 
Section II. Pseudorhodiola Diels. — Perennial. Flowers dioe- 
cious, 4-parted, and otherwise as frequent in Rhodiola. Vegetative 
parts and carpels as in Telephium. Hardy Chinese plants. (P. 73.) 
Section III. Telephium S. F. Gray. — Perennial. Rootstock 
usually thick, branched, often of carrot-like tubers, summit without 
scales. Stems mostly annual, produced from buds beside or above 
the bases of the stems of the previous year. Flowers hermaphrodite, 
5-parted, white, red, purple, or green. Hardy plants, mostly Eurasian. 
(p- 77) 
[Section IV. Giraldiina Diels. — Not in cultivation — two Chinese 
species only.] (P. 107.) " ^ 
Section V. AizooN Koch. — Perennial. Rootstock thickened, 
roots slender. Stems annual (except S. hybridum). Leaves flat. 
