Vascular Flora of PA: Annotated Checklist and Atlas
A hardback book I keep by my chair in the living room and use all of the time is:
(note: you have to scroll down to page "vii" before you see much.)
I think the book is easier to use but I use the online version occasionally when I am away from home.
The Vascular Flora of Pennsylvania: Annotated Checklist and Atlas
(note: you have to scroll down to page "vii" before you see much.)
I think the book is easier to use but I use the online version occasionally when I am away from home.
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