ballhead ragwort, Senecio sphaerocephalus

Ballhead? Not really all that round. But with so many species of Senecio, it's not easy to come up with a different common name for each. Or even the right one. For people who like to puzzle them out, these can be a great source of head scratchers. Then they change the names! Senecio was once the largest genus of plants. Now it's been split. Only problem is most of these grow in the west, so too often I have to settle for another sudoku book from Border's. Ballhead grows in CO, ID, MT, NV, UT, and WY. Ouray Co CO, 6/22/13.