FLORA OF THE LEDGE'S 
81 
Plat 6 is the twelve foot cliff, which is bare of any vascular 
plants. 
Plat 7 lies from the top of the cliff to the watershed of the 
hogback, a distance of thirty-eight yards. 
At this point, where the sun^s rays strike the hilltop, the 
vegetation is immediately of a different character, even ap- 
proaching a prairie type. But the woody plants are becoming 
established in places, giving shade sufficient to protect those 
plants more commonly found on the north slope. 
PART B. 
Plat 8 extends ten yards down the hillside. The plat is cov- 
ered chiefly by Aniennaria plant aginifolia (L.) Kichards. 
Plat 9 is a tract |;wenty-six yards long, covered by a shrubby 
growth. 
Plat 10, sixteen yards long, is rather open clay and dry ex- 
posed rock, with scant plant-cover. 
Plat 11 is a twenty-eight yard strip covered with a fairly 
dense growth of shrubs and young trees. 
From this point there is a sheer drop of twenty-four feet 
down a bare sandstone cliff, plat 12, to plat 13, which is a talus 
and alluvial bank nine feet across, reaching to the edge of the 
stream. 
The appended tables give the data upon a comparative per- 
centage basis with the number of plants in the average square 
yard, rated at 100 per cent. 
The Percentage Distribution of Plants on the North Slope (A). 
Species 
Percentage to Each Plat 
.1 i 
1 
2 
3 
4 
5 
6 
7 
Adiantum pedatum 
2.6 
9.2 
*Camptosorus rhizophyllus 

Cystopteris fragilis 
172”8 
Woodsia obtusa 
’"'.4 
'a9 
Equisetum arvense 

Equisetum hyemale var. 
robustum 
Muhlenbergia Sp 
— - 
4- 
- 
— - 
— - 
— - 
— 
Cinna arundinacea 
Poa pratensis 
— 
+ 
— - 
— - 
— - 
— 
Glyceria aquatica 
”+~ 
Eleocharis palustris 
+ 
— 
— 
— 
— 
*Note — For such plants not easily counted the relative abundance is indi- 
cated by T- or — ; these are not taken into consideration otherwise. 
