12 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
These are followed in frequency by : 
dasyphyllum Lydium populifoUum 
Ellacombianum Middendorffianum pulchellum 
Ewersii muUiceps Sieholdii 
hispanicum Nevii 
The above-mentioned species, twenty-seven in all, represent 
those most usually found in English and Continental gardens, many 
of them under a multiplicity of names. In identifying a . garden 
Sedum, if it will not fit the figure and description which are given 
under the name in the present paper, or if the name under which it 
was received does' not appear in the Index, it will be well, first, to 
compare it with the figures and diagnostic notes relating to the seven 
species first mentioned. If it clearly cannot be matched there, there 
is a great probability that it belongs to the second or third hst 
given above. 
In many cases the quickest way of " running down " a plant will 
be found to be to match it roughly by eye by a rapid survey of the 
illustrations, and then to turn to the description of the suspected 
species for confirmation. In doing this, the following species may for 
practical purposes be ruled out, as being extremely rare, and known 
in Great Britain in only two or three (mostly public) collections : 
Species very rare in Cultivation. 
adenotrichum 
himalense 
Selskianum 
alpestre 
hirsutum 
Semenovii 
alsinejolitim 
longicaule 
stellatum 
hhutanense 
monregalense 
Stevenianum 
bupleuroides 
multicaule 
Stribrnyi 
cauticolum 
Praegerianum 
Taquetii 
Cepaea 
pruinatum 
Tatarinowii 
dumulosum 
pseudospedabile 
tiheticum 
elongatum 
purpureoviride 
verticillatum 
florijerum 
quadrifidum 
villosum 
gracile 
rhodanthum 
yosemitense 
gypsicolum 
ruhroglaucum 
yunnanense 
heterodontiim 
Also all the Mexican species, with the exception of praealtum, 
moranense, and Stahlii ; and some Indian, Chinese, and Japanese 
species, including the Japonica series of Maximowicz and a few 
others : 
Celiae 
Chaneti 
Chauveaudi 
Jormosanum 
indicum 
japonicum 
Leblancae 
lineare 
multicaule 
sarmentosum 
Someni 
trullipetaUim 
variicolor 
viscosum 
Zentaro-Tashiroi 
And, lastly, the plants listed on p. 5, which though they are or 
were in cultivation. I have not succeeded in seeing. 
