. The Canadian field-naturalist. 1982 Notes 351 Common Twayblade, Listera ovata (Orchidaceae), in Wellington County, Ontario: A Second North American Record Allan B. Anderson' and James p. goltz2 'Department of Botany and Genetics, University of Guelph, Guelph, Ontario NIG 2W1. ^Department of Veterinary Pathology, Ontario Veterinary College, University of Guelph, Guelph, Ontario NIG 2W1 Anderson, Allan B., and James P. Goltz. 1982. Common Twayblade, Listera ovata (Orchidaceae) in Wellington County, Ontario: A Second North American Record. Canadian Field-Naturalist 96(3): 351-352. A locality wi


. The Canadian field-naturalist. 1982 Notes 351 Common Twayblade, Listera ovata (Orchidaceae), in Wellington County, Ontario: A Second North American Record Allan B. Anderson' and James p. goltz2 'Department of Botany and Genetics, University of Guelph, Guelph, Ontario NIG 2W1. ^Department of Veterinary Pathology, Ontario Veterinary College, University of Guelph, Guelph, Ontario NIG 2W1 Anderson, Allan B., and James P. Goltz. 1982. Common Twayblade, Listera ovata (Orchidaceae) in Wellington County, Ontario: A Second North American Record. Canadian Field-Naturalist 96(3): 351-352. A locality with seven plants of the Common Twayblade, Listera ovata, in Pulinch Township, Wellington County, is 200 km SSE of the only other fully documented record of this species in North America. The new site differs in light intensity, soil type, moisture and temperature from the previous one. Key Words: Common Twayblade, Listera ovata, Orchidaceae, new record, habitat. On July 27, 1980, the authors discovered seven plants of Common Twayblade, Listera ovata, in the southwest corner of Puslinch Township, Wellington County. The colony was 70 m north of Gait Creek and km southeast of Puslinch Lake, (43°24"N, 80° 15"W). This site was approximately 200 km south- south-east of the original location, Red Bay in the Bruce Peninsula, where this species was first reported in North America (Elliott, 1969; Elliott and Cook, 1970). The plants were growing on a gentle slope in deep cedar litter in full shade beneath White Cedars (Thuja occidentalis) approximately 8 m from the southern edge of a cornfield. No other companion species grew within 2 m of the colony, but nearby were occasional plants of Black Snakeroot (Sanicula marilandica), Helleborine (Epipactis helleborine), and White Birch {Betula papyrifera). On the date of discovery, the soil was dry. However, due to the close proximity of Gait Creek, the soil would likely be subject to seasonal fluctuations in water content. The Pu


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