188 ALPINE PLANTS 
the whole plant a hoary grey appearance. There are also 
a number of erect, compact growing species that simulate 
miniature Conifers, T. azoricus, T. comosus and T. ericzefolius 
being a few such. Gritty soil, rocky niches, the chinks of 
a loosely built wall, or a position on the ordinary alpine 
bed, with a few flat stones pressed around the roots, will 
any of them suffice to ensure the comfort of the Thymes, 
and stock may be easily increased by layering, division, 
or by striking cuttings in a cold frame. 
TIARELLA.—“ Foam flower” is the popular name 
given to Tiarella cordifolia and its varieties, and the 
appropriateness of this name strikes one when a good 
colony is seen with a gentle breeze upon its fragile, 
feathery, milk-white blossoms, waving on slender but 
wiry stems. The growth of Tiarella cordifolia is dwarf, 
tufted, spreading by means of runners, which take root 
and extend the plant in all directions. The foliage is 
very effective in winter as well as summer, a bronzy tint, 
suffusing with a pale green, and a glistening sheen over- 
spreading the whole. 
TUNICA SAXIFRAGA.—Useful as an autumn blooming 
plant of lively colour, the Tunica makes slender trailing 
growths, covered with small foliage, and produces airy 
panicles of rosy tinted flowers. It is not a difficult plant 
to grow, and its lightness and elegance give it a very 
attractive and pleasing appearance. Where clumps of 
spring flowering bulbs occupy pockets on the rockery, a 
plant or two of Tunica may very well be planted, to cover 
what would otherwise be a bare patch during the summer 
and autumn. 
