Open Access Open Access  Restricted Access Subscription Access

Square-stalked St. John’s-wort, Hypericum tetrapterum, in Peel Region, Ontario: a New Non-native Vascular Plant Species for Eastern North America

Charles P Cecile, Michael J Oldham

Abstract


The Eurasian Square-stalked St. John’s-wort (Hypericum tetrapterum Fr.: Hypericaceae) was found growing in an open Eastern White Cedar (Thuja occidentalis L.) swamp in Caledon, Regional Municipality of Peel, Ontario. This is the first record for eastern North America; previous North American occurrences have been on the Pacific coast in Vancouver, British Columbia, Canada (1991), and in Wahkiakum County, Washington State, USA (2003).


Keywords


Hypericum tetrapterum; Square-stalked St. John’s-wort; Hypericaceae; vascular plant; Peel Region; Ontario; Canada; new record; non-native

Full Text:

PDF


DOI: http://dx.doi.org/10.22621/cfn.v130i3.1886



Volumes that are more than six years old are freely available courtesy of the Biodiversity Heritage Library.

 


Questions or problems with the website? Contact William Halliday (info -at- canadianfieldnaturalist -dot- ca).