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Tetraneuris herbacea
This perennial herb is a federally listed threatened species of the United States and of Canada.
This plant occurs on alvars, a type of limestone pavement with little plant cover. These rocky outcrops have thin, alkaline soils and are quite dry in the dry seasons, making them inhospitable for many other plant species, so the lakeside daisy grows in unshaded full sun.
I spotted this in Bruce Peninsula national park.
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