NICHOLS: THE VEGETATION OF CONNECTICUT 250 
ela canadense Hepatica triloba 
i virginica Anemone quinquefolia 
. alictrum dioicum Caulophyllum thalictroides 
nemonella thalictroides Sanguinaria canadensis 
Smilacina racemosa Dicentra cucullaria 
sama biflorum Dentaria diphylla 
edeola virginiana Dentaria laciniata 
Trillium erectum Viola pubescens 
Be 2 re ous of Rock Blufs.—In comparing rock bluffs with 
; oe one striking dissimilarity concerns the bryophytic 
ora. Species inhabiting the rock-face or the crevices, together 
with certain of the forest-floor species, may be well represented, 
but most of the others are absent. Under favorable circumstances 
* upaaemee support a highly mesophytic vegetation; much 
cig é mite: on exposure and on ground-water relations. 
sa onnecticut River, south of Middletown, the north- 
cing bluffs are (or were) well forested; most of the vascular 
plants already cited as characteristic of rock ravines grow luxuri- 
antly; Acer pennsylvanicum is common, attaining a height of 
more than thirty feet; and the mesophytic ravine mosses are well 
represented. The vegetation on the south-facing bluffs across 
the river, however, especially as regards the herbaceous flora, is 
much less mesophytic. In general, north- or east-facing bluffs 
abe more mesophytic than those which. face south or west. As 
might be expected, the highest degree of mesophytism prevails 
toward the bottom of a bluff; toward the top the vegetation is 
more xerophytic. In some cases, where the water supply is 
insufficient, mesophytes may be virtually lacking and xerophytes 
predominate from top to bottom. On the whole, the vegetation 
of the rock bluffs which border stream valleys throughout the 
state resembles that which has been described elsewhere* as 
characteristic of talus slopes. 
FLoop PLAINS 
e place during the building 
a fairly definite succession 
flood plain develop- 
The topographic changes which tak 
up of a flood-plain are accompanied by 
of plant associations. In the earlier stages of 
* See Torreya 14: 181-184. I914. 
