. Bulletin. Biology -- Ohio; Plants -- Ohio. BOTANICAL SURVEY—SUGAR GROVE REGION 287 The Unifolium Society. This is tiie Unifolium society, composed almost purely of Unifolium canadense, or mixed with the partridge berry (MitcJiella repens) (fig. 22). This association occurs on shaded, flat-topped boulders, which in the course of time become covered with a few inches of almost pure sand (l(M-ived from the decay of the rock beneath. Isolated as they are, plants in such habitats have no access to a supply of permanent ground water, but are dependent on the. .*>St Fig. 22. "Wild Lily of t
. Bulletin. Biology -- Ohio; Plants -- Ohio. BOTANICAL SURVEY—SUGAR GROVE REGION 287 The Unifolium Society. This is tiie Unifolium society, composed almost purely of Unifolium canadense, or mixed with the partridge berry (MitcJiella repens) (fig. 22). This association occurs on shaded, flat-topped boulders, which in the course of time become covered with a few inches of almost pure sand (l(M-ived from the decay of the rock beneath. Isolated as they are, plants in such habitats have no access to a supply of permanent ground water, but are dependent on the. .*>St Fig. 22. "Wild Lily of the Valley" (Unifolium) on a Detached Boulder. Betula lenta at Left. amounts which can be conserved from rainfall in the scanty sub- stratum. Such water is, of course, very meagre, llic more so since the habitat is not adapted physically to retain watei-, and at the same time drains freely on all sides. Wlicii siicli rocks are exposed to tlic dessica- tion of direct sun and wind, none of the seed plants can endure the conditions, Init when protected by dense shade of the forest canopy above them, Unifolium develops thriftily. Tliis ])l;nit is not. however, Jimilcd lo l)oiil(h'i-s. ])ut occurs all through Ihe jirca in niiiurrous situations, varying from this periodically xeropliytic habitat to tlie extremely nicsopliylic hemlock forest. It may Ihcrefore \u' inrci-rcd that tlie purily of the is dui' not to any pi-ffn-cnci' of I'ni- folium for Ihe habitat, but to the inabilitv of other i)hints successl'uUv • I • to invjidc 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 Ohio Biological Survey. Columbus, Ohio : Ohio State University
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