CHOICE PLANTS FOR ROCK GARDENS = 135 
however, may be made, for C. calceolus, which is a native 
plant, although but rarely to be found wild, likes a lime- 
impregnated soil of a fairly stiff character. This is a 
very beautiful plant, as indeed all the “‘lady’s slippers ”’ 
are. Its sepals and narrow strap-like petals are of a 
polished brown, the pouch or slipper is of clear yellow. 
C. spectabile is generally acclaimed the finest of the hardy 
kinds. It grows to a good height, frequently 2 feet or 
over, and the flowers are well set off by luxuriant foliage. 
The slipper, which is large and bold, is of a delightful 
rich rose pink, the rest of the flower being white. It is 
not at all difficult to grow, and once established in a good 
deep bed of peaty soil, where moisture is not scanty, it 
will grow in strength and beauty year by year. There 
are many other good Cypripediums, some being brightly 
and boldly coloured, and others quaintly and strikingly 
marked with shades of green and brown. 
DaruNneE.—If for no other reason than that the Daphnes 
are among the most deliciously fragrant flowers that grow, 
we must include either the rosy pink D. cneorum, or the 
white-flowered D. alpina and D. blagayana, among the 
shrubby subjects in our collections of rock plants. Planted 
in sandy loam, layered when increase of stock is required, 
but otherwise left undisturbed, the Daphnes will delight 
every visitor to the garden with their rich perfume. 
Diantuus.—The ‘“ Pink” tribe is a varied and very 
interesting family of hardy plants, the greater part of 
which are particularly well suited for the rock garden, 
where, so long as they have free drainage and a fair share 
of sunshine, they present no great cultural difficulties. 
