When is an aster not an aster? Never, for almost everyone. But often, for botanists. And now more than ever. The work of the chromosome crunchers is resulting in many changes in the ways we think plants are related. This often results in things being lumped together in new ways. Not so with asters. The aster genus is now divided into several others. On the other hand, this one has actually been separate all along, and is an aster only in name. But doesn't that make it an aster in any case? This species often has blue flowers. It occurs in AZ, CA, CO, IA, ID, KS, MN, MT, ND, NE, NM, NV, NY, OK, OR, SD, TX, UT, WA, WY, AB, BC, and SK. Mesa Verde National Park, Montezume Co CO, 6/22/13.