. The Canadian field-naturalist. 92 The Canadian Field-Naturalist Vol. 97. SCALE O 200 400 Miles I 'l ' I ' I' O 200 600 Km Figure 2. Canadian Distribution of pensylvanica. quite limited for the plant, and it is reportedly scarce wherever found in this country. Macoun (1886) cited an early Ontario collection by David F. Day from "low places, near Fort Erie" (in Welland Co., 42°54'N, 78°56'W), but Looman(1973) indicated that a herbarium search by Dr. Bernard Boivin had failed to locate the Day specimens to substantiate that report. According to Looman, Boivin's (1966) inclu
. The Canadian field-naturalist. 92 The Canadian Field-Naturalist Vol. 97. SCALE O 200 400 Miles I 'l ' I ' I' O 200 600 Km Figure 2. Canadian Distribution of pensylvanica. quite limited for the plant, and it is reportedly scarce wherever found in this country. Macoun (1886) cited an early Ontario collection by David F. Day from "low places, near Fort Erie" (in Welland Co., 42°54'N, 78°56'W), but Looman(1973) indicated that a herbarium search by Dr. Bernard Boivin had failed to locate the Day specimens to substantiate that report. According to Looman, Boivin's (1966) inclu- sion of the species for Ontario was based only on the more recent collections by Ward and C. E. Carton from the Rainy River area of far western Ontario. Scoggan (1978) further cites it, however, from Long Beach in Welland County, Ontario (42°52'N, 79°23'W), based on a report by Zenkert (1934). I am unaware of any other Ontario records for the Swamp Saxifrage. Looman (1973) recorded it from the Moose Lake area (49°12'N, 95°19'W), southeastern Manitoba, a location just across the Lake-of-the-Woods within 50 miles of the Rainy River station in Ontario. The recent White and Johnson (1966) listing of the Manitoba rare plants cites only this single locality for the species in Manitoba. It was omitted for any of the Prairie Provinces by Breitung (1957), Scoggan (1957), Budd and Best (1964), Boivin (1968), and even Scoggan (1978). Figure 2 shows the widely separated Canadian stations thus far recorded for the species. The present record from the Saskatchewan Pasquia Hills represents a surprising and phytogeographically quite interesting find, marking a 640 km (about 400 mile) northwestward extension of the species' known range in Canada. The Saskatchewan Pasquia Hills, along with the Porcupine Hills and Duck Mountain upland, are parts of the Manitoba Escarpment, representing highlands that bordered the south shores of former Glacial Lake Agassiz. These hills are phyto- geograph
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