tansy-aster, Machaeranthera tanacetifolia

Decades ago someone in the Flora of North America office told me they wouldn't be done in my lifetime. Since then I have anxiously waited for new volumes, not sure if it's better to win or lose that contest. But now I realize I was always the winner, and I will definitely go first. They will never finish! Machaeranthera led to that revelation today. As circumscribed in FNA by Morgan and Hartman, there are two species. Other treatments include many more. FNA mentions 59 others. Ongoing research and discoveries will always be changing the nomenclature of our flora. FNA is now online, and they can change their information with each new discovery. Didn't see that coming in the 1970s! This tansy-aster grows in AZ, CA, CO, IL, KS, MT, NE, NM, NV, NY, OK, SD, TX, UT, WY, and AB. Lady Bird Johnson Wildflower Center, Travis Co TX, 4/17/22. Aster family, Asteraceae.