- 45 - 
Muoh of the rook at the bare summit is more or less 
porous in texture; rook fragments are numerous but irregular. 
Joint and bedding planes are not as distinctly marked as 
on the face of the escarpment. Whenever a orevice occurs, 
however, soil readily collects, and a number of plants gain 
a footing. The summer flora is practically a xerophytic 
one; the occurrence of certain vernal species, however, 
indicates that during the spring there is a comparatively 
large amount of moisture on the ridge, due in part, pro¬ 
bably, to the melting snow. Of the orevice plants, Danthonia 
spioata , already mentioned, is one of the most important, 
on account of it3 abundance and its densely tufted habit 
of growth. Other noteworthy crevice plants are Solidago 
randii Britton var. montioola Porter, Potentilla tridentata . 
artemisia candata Michx., Woodsia ilvensis (L.) R. Br., 
Campanula rotundifolia L. (harebell), Viola arenaria DC. 
(sand violet), Aquilegia canadensis L. (wild columbine), 
Panicum denauperatum Muhl. and Panicum meridionale Ashe. 
Where a small amount of dry soil has accumulated, the 
following occur: Antennaria neodioica Greene (everlasting), 
Lechea striota Leggett (pinweed), Panicum xanthophysum 
Gray, Satureja vulgaris (L.) Fritsch. (basil), Aralia 
hispida Vent, (bristly sarsaparilla), Apocynum androesi - 
mifolium L. (spreading dog bane). Bpigaea repeps L. (trailing 
