Open AccessSquare-stalked St. John’s-wort, <i>Hypericum tetrapterum</i>, in Peel Region, Ontario: a New Non-native Vascular Plant Species for Eastern North America
Author(s) -
Charles P Cecile,
Michael J. Oldham
Publication year - 2016
Publication title -
canadian field-naturalist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 28
ISSN - 0008-3550
DOI - 10.22621/cfn.v130i3.1886
Subject(s) - hypericum , square (algebra) , geography , white (mutation) , swamp , archaeology , botany , biology , ecology , biochemistry , geometry , mathematics , gene
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).