Machaeranthera genus --- Aster Subfamily 2.2 

smallflower tansyaster (Machaeranthera parviflora) -- in September -- Villanueva State Park, NM      blue & purple    

tansyleaf tansyaster (Machaeranthera tanacetifolica) -- in May -- Pawnee National Grassland, CO             blue & purple     

tansyleaf tansyaster (Machaeranthera tanacetifolia) -- in May -- Picketwire Canyon, Comanche National Grassland, CO   ​  blue & purple