. A botanical survey of the Sugar Grove region. Plant ecology -- Ohio Sugar Grove Region; Plants -- Ohio Sugar Grove Region Classification. BOTANICAL SURVEY—SUGAR GROVE REGION 287 The Vnifolium Sovietij. This is the rnifoliuin society, composed ahnost purely of UnifoUuin ca)iade)ise, or mixed with the partridge berry (MitcJieUa repens) (fig. 22). This association occurs on shaded, fiat-topped bouhkM-s, wincli in tlie course of time become covered with a few inches of ahnost pure sand derived from the decay of the rock beneath. Isolated as they are, plants in such habitats have no access to a s
. A botanical survey of the Sugar Grove region. Plant ecology -- Ohio Sugar Grove Region; Plants -- Ohio Sugar Grove Region Classification. BOTANICAL SURVEY—SUGAR GROVE REGION 287 The Vnifolium Sovietij. This is the rnifoliuin society, composed ahnost purely of UnifoUuin ca)iade)ise, or mixed with the partridge berry (MitcJieUa repens) (fig. 22). This association occurs on shaded, fiat-topped bouhkM-s, wincli in tlie course of time become covered with a few inches of ahnost pure sand derived from the decay of the rock beneath. Isolated as they are, plants in such habitats have no access to a supply of jiermanent ground water, but are dependent on the. C^^^''^^^^ ^^^^ Fiar. 22. "Wild Lily of the Valley" (Unit'olium) on a Detached Boulder. Betula ienta at Left. amounts which can be conserved from rainfall in the scanty sul)- stratuuL Such water is, of course, very meagre, the more so since the habitat is not adapted physically to retain water, and at the same time drains freely on all sides. When such rocks are exposed to the dessica- tion of direct sun and wind, none of the seed plants can endure the conditions, but when protected by dense shade of the forest canopy above them, Unifolium develops thriftily. This plant is not, however, limited to isolated boulders, but occurs all through the area in numerous situations, varying from this periodically xerophytic habitat to the extremely mesophytic hemlock forest. It may therefore be inferred that the purity of the association is due not to any preference of Uni- folium for the habitat, but to the inability of other plants successfully to invade Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Griggs, Robert F. (Robert Fiske), 1881-1962. Columbus : Ohio State University
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