Reference
The Key to the Vascular Flora of the Northeastern United States and Southeastern Canada. Floyd Swink. Plantsmen’s Publications, Box 1, Flossmoor, IL 60422. 1990. vi+513+11 un-numbered xii pages. $21.95 (paper)+$3.00 shipping and handling.
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Thieret, J.W. The key to the Vascular Flora of the Northeastern United States and Southeastern Canada. Floyd Swink. Brittonia 45, 158 (1993). https://doi.org/10.2307/2807499
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DOI: https://doi.org/10.2307/2807499