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

Authors

  • Charles P Cecile
  • Michael J Oldham

DOI:

https://doi.org/10.22621/cfn.v130i3.1886

Keywords:

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

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).

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Published

2016-11-30

Issue

Section

Articles