86 ALPINE PLANTS. 
Great care must be taken to keep this species 
from any drip or where the moisture is 
excessive in the winter months, or it will be 
sure to damp off. In the latter part of summer 
it should not be allowed to become dry ; the 
summer is a most critical time for all the 
sunny varieties, as in their native homes 
they are getting well supplied with moisture 
from the melting snows, which we cannot 
supply here, thus watering must be done 
artificially. Top-dress in the autumn with 
gritty loam. They should be looked to in 
the spring to see that the frost has not lifted 
them out of the ground. [If left in this exposed 
condition they will soon die off, and there will 
be nothing to be seen by the time they should 
be in flower. S. dtapensioides. This is a 
limestone plant, and requires to be wedged 
tightly between stones in a sunny position. 
Great care must be taken to see that it does 
not get washed out of its place during the 
winter. Compost: two parts limestone, one 
part good rough loam; no sand. _ S. calycifiora. 
A very rare and beautiful species, requiring the 
same treatment as SS. diapensioides.  S. 
longifolia, commonly called “The Queen of 
