Square-stalked St. John’s-wort, Hypericum tetrapterum, in Peel Region, Ontario: a New Non-native Vascular Plant Species for Eastern North America
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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).
1986 ◽
Vol 21
(3)
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pp. 214-218
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2005 ◽
Vol 32
(3)
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pp. 475-492
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1929 ◽
Vol 4
(2)
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pp. 145-161
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2012 ◽
Vol 124
(5-6)
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pp. 957-974
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