Botanical Sites of interest near Billings, Montana for trip planned in summer

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New River Valley
Title: Guest
Joined: 2011-02-01
Botanical Sites of interest near Billings, Montana for trip planned in summer

I plan to visit friends who have recently moved to Billings, Montana.  I would like to rent a car and do some plant exploration in the summer.  Where is the best place to go?  When is the best time to go?

Beth Umberger Zone 6 in the mountains of SW Virginia.