190 HARDY PERENNIALS 
considerable size, but for some reason it has never 
become as plentiful as its merits would warrant. 
Senecio Clivorum is one of the giants of the family, 
with immense leaves and great heads of orange- 
yellow flowers. It attains noble proportions if 
planted by the water-side. 
Sidalcea. — Known as Greek Mallow, the Sidalceas 
grow erect with spikes of bloom resembling small 
Hollyhocks. They withstand drought very well, 
although they attain greater size when not stinted 
for moisture, S. Candida is pure white, grows 
three or four feet high, and yields a good display of 
bloom without covering a great deal of ground space. 
S. Listeri is of a very delicate and pleasing shade of 
shell pink, the petals being prettily fringed at the 
edges. S. malvseflora and several named forms of 
it have deeper rosy and cerise blossoms on two-foot 
stems. 
Silphium. — Yellow-flowered composites are plenti- 
ful, but not too plentiful to allow welcome for such 
plants as Silphium laciniatum and perfoliatum. 
Both are big yellow daisies borne on tall stiff stems 
clothed with big bright-green leaves, but the 
particular shade of yellow is somewhat uncommon, 
deeper than lemon, but cool and refreshing rather 
than rich and glowing. In late Summer and 
Autumn a large isolated bed filled with these stately 
plants forms a striking object when viewed from a 
distance. The clumps easily divide in early Spring. 
Solidago. — However poor one's soil, however stony 
