Very cool, if a bit perplexing. Hard to fathom, for just one example, how the Keweenaw Peninsula of Michigan's Upper Peninsula could be in any but the highest category. That's a completely wild and unsettled region! And no, I'm not guessing-I've been there many times. All forested, all big white pines, hemlocks, and their many hardwood associates, to simplify. My point being, there's hardly any civilization there beyond a few very small towns, and the rest is heavy, native forest. Not to nitpick, but I can see other just as unexpected results all over that thing.

All in all though, very cool. Just wish I could make out more of the print on the other ones.

+oM

Well, one thing is that it's based on county-level counts of species rather than individuals. So a single report of one exotic species has the same weight as thousands of white pines.

Certainly there must be some variation in how extensively any particular county has been surveyed -- or to what extent local surveyors have been reporting exotic species vs. native ones.

Interesting to me how the native percentages are lower in little spots around university towns in the Midwest.

I liked seeing specific plant families, such as Trilliaceae.

Unweighted then-that explains that. Thanks!

+oM