The area covered by this flora includes all of the INL Site, immediately adjacent foothills of the Lost River and Lemhi Ranges, and all of Big Southern Butte. The flora consists of 472 species of vascular plants in 59 families; 409 species occur on the INL Site proper. Six subspecies and eight varieties are included herein, bringing the total number of recognized taxa to 486. The largest families are the:
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