. The Canadian field-naturalist. 132 The Canadian Field-Naturalist [Vol. 67. Fig. 2. Major elementary areas of the circumpolar plants (after Hulten). comparing the distribution pattern of P. coerulea with species of similar range but less disjunct occurrence, he deduced the probable routes through which this species migrated to attain its then known distribu- tion. The hypothetical area once populated by P. coerulea and from which it has since been removed by glacial action and climatic factors, was demonstrated in his fig. 7 (loc. cit. page 95), here reproduced as fig. 1. On this map, the act
. The Canadian field-naturalist. 132 The Canadian Field-Naturalist [Vol. 67. Fig. 2. Major elementary areas of the circumpolar plants (after Hulten). comparing the distribution pattern of P. coerulea with species of similar range but less disjunct occurrence, he deduced the probable routes through which this species migrated to attain its then known distribu- tion. The hypothetical area once populated by P. coerulea and from which it has since been removed by glacial action and climatic factors, was demonstrated in his fig. 7 (loc. cit. page 95), here reproduced as fig. 1. On this map, the actual distribution of this spe- cies as known to Hulten, is represented by hatched lines, the hypothetical area is cir- cumscribed by a broken line. This hypo- thetical area, in North America, included all of Alaska and Yukon, with the exception of the northern coast, the continental North- west Territories, Southampton Island, south- ern Baffin Island, southern Greenland, Ice- land, northern Quebec and Labrador south through western Newfoundland and Gaspe to the New England States. Fig. 2 (Hulten fig. 11 loc. cit. page 119) illustrates the major elementary areas of cir- cumpolar plants. A comparison of fig. 1 with fig. 2, shows that P. coerulea is pre- sent in nearly all but the most southern of these rigid or elementary areas. This spe- cies would therefore have been an excellent example of a rigid 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 Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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