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001: Aquatic and Wetland Plants of Northeastern North America, Volume I: A Revised and Enlarged Edition of Norman C. Fassett's A Manual of Aquatic ... Gymnosperms, and Angiosperms: Dicotyledons Hardcover – June 22, 2000
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About the Author
Garrett E. Crow is professor of botany at the University of New Hampshire.
C. Barre Hellquist is professor of biology at the Massachusetts College of Liberal Arts.
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My main complaints with the volumes are: 1) they do not contain all the wetland species you are likely find in a wetland and do not indicate where they are incomplete. You could easily key out a specimen and come up with an incorrect identification because you have a species they omitted; 2) there are always some non-wetland species in a wetland and these are not covered in the volumes. Again you can come up with an incorrect identification.
For these reasons the volumes make false identifications likely. And, if you can recognize when they are leading you astray, you've already passed through the level where they could be useful.
The information is well presented and the illustrations are clear. The keys are focused on distinctive features and are easy to follow. That being said, these books are best used by someone with at least some botanical background, and they wee originally written back in the 1950s. They have been updated, but our understanding of the relationships between plant species changes rapidly and some of the names may be older ones, and some of the species may have been broken into several different species since the writing of these books.
If you are a naturalist, botanist, or just interested in wetland plants these are great books.