. The Canadian field-naturalist. 1976 Notes 467 Spiranthes magnicamporum Sheviak, an Addition to the Orchids of Canada Abstract. The recent discovery of Spiranthes magni- camporum Sheviak at several locations in southwestern Ontario extends its known range significantly in the northeast. Described in 1973, this orchid was previously known from the midwestern United States, reaching its northeastern limit at disjunct stations in western Ohio. In southwestern Ontario, S. magnicamporum is essentially restricted to areas of natural, prairie-like vegetation, and it may have persisted in some of the
. The Canadian field-naturalist. 1976 Notes 467 Spiranthes magnicamporum Sheviak, an Addition to the Orchids of Canada Abstract. The recent discovery of Spiranthes magni- camporum Sheviak at several locations in southwestern Ontario extends its known range significantly in the northeast. Described in 1973, this orchid was previously known from the midwestern United States, reaching its northeastern limit at disjunct stations in western Ohio. In southwestern Ontario, S. magnicamporum is essentially restricted to areas of natural, prairie-like vegetation, and it may have persisted in some of these areas since the xerothermic period. Calcareous sandy meadows associated with the lower lakes appear to be the most important habitat. In contrast, the closely related S. cernua (L.) Rich, is widespread in southern Ontario, owing to the colonization of disturbed habitats resulting from human activity. The associated species, distinguishing characteristics, and ecology of S. magnicamporum in Ontario are briefly discussed. During a recent autumn field trip to investigate prairie vegetation in southwestern Ontario, I was particularly interested to find the Great Plains Ladies'-tresses Orchid, Spiranthes magnicamporum Sheviak. The distribution of this recently described species (Sheviak, C. J. 1973. A new Spiranthes from the grasslands of central North America. Botanical Museum Leaflets, Harvard University 23(7): 285- 297) was previously known to encompass an area extending from northwestern Indiana onto the Great Plains from Texas to North Dakota, with disjunct populations on the prairies of western Ohio and the black belt of the Mississippi and Alabama (Sheviak, op. cit.). The distribution of this orchid in Ontario is shown in Figure 1. Field work during the autumn of 1975 disclosed its presence on the Ojibway Prairie south of Windsor in Essex County, on Walpole and Squirrel Islands, at the east end of Ipperwash Beach in Lambton County, and at the base of Long Point in Norfolk
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