. The Canadian field-naturalist. 1977 Notes 423. Figure 1. Distribution of Paspalum ciliatifolium var. muhlenbergii (^) Paspalum ciliatifolium var. stramineum (|) in Ontario. of these taxa is appropriate. Several early works dealing with the genus Paspalum have considered P. ciliatifolium to consist of three separate species (Nash 1912; Rydberg 1932; Hitchcock and Chase 1950). Gleason (1952), however, recognizes a single species, P. ciliatifolium. composed of three varieties cor- responding to the three species of earlier authors. It is Gleason's interpretation that we are following. Voss
. The Canadian field-naturalist. 1977 Notes 423. Figure 1. Distribution of Paspalum ciliatifolium var. muhlenbergii (^) Paspalum ciliatifolium var. stramineum (|) in Ontario. of these taxa is appropriate. Several early works dealing with the genus Paspalum have considered P. ciliatifolium to consist of three separate species (Nash 1912; Rydberg 1932; Hitchcock and Chase 1950). Gleason (1952), however, recognizes a single species, P. ciliatifolium. composed of three varieties cor- responding to the three species of earlier authors. It is Gleason's interpretation that we are following. Voss (1972) indicates the presence of two varieties of P. ciliatifolium in Michigan, P. ciliatifolium var. muhlenbergii (Nash) Fern, and P. ciliatifolium var. stramineum (Nash) Fern. Both of these varieties have been found in the Ontario collections described here. Species Range In the broad sense, P. ciliatifolium is a widely distributed species of the United States (Hitchcock and Chase 1950; Gleason 1952). The American range is described by Gleason (1952) as extending from New Hampshire and Massachusetts, west to Michigan, Minnesota, Kansas, and Arizona, and south to the Gulf of Mexico. Paspalum ciliatifolium var. muhlen- bergii is found throughout much of this range, but P. ciliatifolium var. stramineum tends to occur in the western part of the range, being considered a species of the prairies and plains (Rydberg 1932). The first Canadian station, in Essex County, was revisited on 16 August 1976, when voucher specimens were collected (deposited in OAC, TRT). Specimens of the Kent County stations have been deposited in TRT. Collection data for the Ontario stations are as follows: P. ciliatifolium var. muhlenbergii Essex Co.: East end of Rickard Street ca. 320 m west power line, west of Maiden Road, Windsor (in Ojib- way Prairie Provincial Nature Reserve); open, dry, clay soil beside overgrown roadbed, forming dominant ground cover. W. J. Crins, P. D. Pratt, H. L. Dickson, J. Golt
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