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THE MICHIGAN BOTANIST
Vol. 43
present fragmented nature of the preserve and the localized occurrences of O.
humifusa suggest that establishing O. humifusa on additional sites in Oak Openings Preserve might be desirable. Opuntia humifusa can be established by removing pads from existing plants and planting the pads (Voss 1985).
Because of the potentially threatened status of O. humifusa in Ohio, the acquisition of sites by conservation organizations containing O. humifusa or providing suitable habitat in the Oak Openings region is consistent with the perpetuation of this rare species in Ohio. Results of this study suggest that sandy sites
disturbed by agricultural clearing, sand mining, or other soil disturbances should
not be overlooked for their potential to provide O. humifusa habitat in the Oak
Openings region.
ACKNOWLEDGEMENTS
We thank Denise Gehring, Bob Jacksy, Jenny Finfera, Monique Beans, Chris Ferree, Karen
Menard, Heather Norris, Mark Plessner, Kathryn Nelson, Sarah McCallum, Kim High, and others
with the Toledo Metroparks for monitoring rare plant species in Oak Openings Preserve. Jenny Finfera and Bob Jacksy maintain the rare plant database. We also thank Neil MacDonald and Jenny Finfera for reviewing the manuscript.
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