ACCOUNT OF GENUS SEDUM AS FOUND IN CULTIVATION. 27 
Group I. RosEAE. — Caudex-leaves scale-like, short, membranous, 
seldom green even when young. Old flower-stems not persistent. 
(P. 28.) 
roseum Scop. elongatum Wall. 
heferodontum H. f. and T. hhutanense Praeger. 
Kirilowii Regel. purpureoviride Praeger. 
longicaule Praeger. bupleuroides Wall. 
rotundatum Hemsl. 
Group 2. HiMALENSES. — Caudex-leaves scale-like, usually green 
and fleshy when young, often prolonged into a short narrow blade 
or tail. Old flower-stems usually persistent. (P. 49.) 
tiheticum H. f. and T. himalense Don. 
quadrifidum Pallas. fastigiatum H. f. and T. 
Series II. Crassipedes. 
Flowers hermaphrodite and 5-parted. Caudex as in the Rhodiolae 
s.s. Caudex-leaves as in the Himalenses. Flower-stems persistent 
or deciduous. Carpels usually slender, with slender styles not reflexed 
in fruit. (P. 55.) 
crassipes Wall. trifidum Wall. 
Stephani Cham. Semenovii Masters. 
dumulosum Franch. rhodanthum A. Gray. 
Series III. Primuloides. 
Flowers as in the Crassipedes. Caudex slender elongate, or 
short not much thickened (comparatively). Caudex-leaves leaf- 
like, with a distinct blade, usually stalked. 
Group I. LoNGiCAULES. — Rootstock elongate, much branched. 
primuloides Franchet. 
Group 2. Brevicaules. — Rootstock very short, branched shghtly 
or not at all. 
Praegerianum W. W. Sm. 
Rhodiola is essentially an Asiatic and sub-alpine group, finding 
its maximum development in the great mountain area stretching 
from Afghanistan to Yunnan. Northward it extends into the. Arctic 
Regions ; southward its range is limited. One species, S. roseum, 
which is also the most variable of the group, is circumpolar in its 
distribution. Another, S. rhodanthum, is confined to North America. 
Of the group in its wide sense, as used in this paper, about fifty 
species have been described, of which twenty-one are in cultivation, as 
listed above and described below. 
The great variability of many of the species (see Hooker and 
Thomson in Journ. Linn. Soc, Bot., vol. ii. p. 93) renders diagnosis 
often difficult. Especially as regards the colour of the different 
