EASILY GROWN ROCK PLANTS 83 
relatives, the Erysimums. From such seedlings one is 
practically certain to obtain quite a number of variously 
coloured crosses, some of which will very likely be sufficiently 
distinct and pleasing to justify propagation from cuttings. 
CHRYSANTHEMUM.—Whoever loves a daisy, and surely 
that includes all who have a love for flowers at all, will 
be charmed with the simple chastity and beauty of some 
of the diminutive mountain species of this wonderful 
and extensive family. Within the genus Chrysanthemum 
we have daisies of every size, from that of the white- 
flowered C. caucasicum, which grows no larger than Burns’ 
““ Wee modest crimson-tipped flower,’”’ to the great blooms 
of the giant forms of C. maximum. The latter, of course, 
are plants for the border, but there are quite a number of 
miniatures that are ideal for the alpine collection. C. 
argenteum has silvery leaves as well as charming daisy 
flowers, other sorts for our purpose being C. alpinum and 
C. arcticum. Propagation by cuttings may be effected 
either in autumn or early spring. 
CoRYDALIs.—Corydalis lutea, an old favourite, with 
fern-like foliage and yellow flowers, may be seen growing 
between the stones of old walls, in moist, shady places 
in many a cottage garden, and it is a plant of considerable 
beauty and usefulness for such damp, sunless situations, 
being an extraordinary plant for continuity of bloom. 
This is the simplest and easiest member of the genus, 
but several other species of fumitory, as the Corydalis 
are called, are extremely beautiful, and well worthy of 
pot culture or some little winter protection. These choicer 
kinds will be dealt with in other sections of this book. 
