. The Canadian field-naturalist. 342 The Canadian Field-Naturalist Vol. 107. Figure J. Population of fruiting, ca. 3 m high Marsh Sow-thistle (Sonchus palustris) in cat-tail {Typha spp.) dominated ditch by fen forest (Albion Wetland, Gloucester, September 1993); note 12 cm high drink can at base of tallest plant (centre right) for scale. were any references noted in a survey of appropriate regional, national and continental floristic sources (, Morton and Venn 1990; Scoggan 1979; Kartesz and Kartesz 1980; Fernald 1950). That leads us to conclude that this Ontario record represents the firs
. The Canadian field-naturalist. 342 The Canadian Field-Naturalist Vol. 107. Figure J. Population of fruiting, ca. 3 m high Marsh Sow-thistle (Sonchus palustris) in cat-tail {Typha spp.) dominated ditch by fen forest (Albion Wetland, Gloucester, September 1993); note 12 cm high drink can at base of tallest plant (centre right) for scale. were any references noted in a survey of appropriate regional, national and continental floristic sources (, Morton and Venn 1990; Scoggan 1979; Kartesz and Kartesz 1980; Fernald 1950). That leads us to conclude that this Ontario record represents the first report of S. palustris for North America. As S. palustris is not described in North American literature a summary of important differences between it and S. arvensis is provided below (Table 1).. 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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