114 Alpine Plants. 
Sempervivum (Mediterranean Region to Western Himalaya). 
A very interesting group, which may be grown 
on any rockery stone. They grow best when 
planted on a patch of clay, which should first be 
made fairly moist, then be laid on the stone and 
the Sempervivum dibbled in. They will soon take 
hold and make a good clump. No cow manure 
must be added—though it is sometimes used for 
mixing with the clay—for it is liable to be in- 
fested with grubs, to get at which in summer the 
birds pull out all the Sempervivum and consequently 
the plants are all destroyed. By using pure clay 
this is avoided. 
Senecio abrotanifolius (Europe). 
Treat like Senecio tyrolensis. 
Senecio adonidifolius (S. Europe). 
Treat like Senecio tyrolensis. 
Senecio carniolicus (Alps). 
Treat like Senecio incanus. 
Senecio incanus (Alps). 
Plant, near the eye, on a little table-land at 
the base of a rock, on a well-drained, sunny bank, 
facing south or south-west, in equal parts of loam 
and leaf-mould together with a little fine limestone. 
In spring, top-dress with a little leaf-mould and 
sand. In autumn, top-dress round the collar of 
the plant with a little fine broken limestone. 
Senecio leucophyllus (Pyrenees, Sierra Nevada). 
Treat like Senecio incanus, except that this 
species must be kept a little dryer, on account of 
