Great Freebie for plant ID in upper midwest

Nothing beats recognizing a family, or what passes for a family, when trying to ID a plant.  A lot of the common families are pretty easy to identify on sight especially if you have a nice "cheat" sheet to help you out.  So kudos to the Field Museum and plant illustrator Kathleen Garness for this nice guide to common plant families of the Chi-town area.  But the same families are going to be common enough across the whole upper midwest.  Now here's the best news: these family guides are free!  Download the sheets and put together your family ID field guide. Too bad you'll have to wait until spring to try it out.  HT to Art Plantae.