verbena genus --- vervain family

bigbract verbena (Verbena bracteata) -- in May -- Orchard Cove Trail, Lory State Park, CO          blue & purple          

bigbract verbena (Verbena bracteata) -- in July -- Sportsman Lake Road, southeastern Wyoming      

​bigbract verbena (Verbena bracteata) -- in August -- Orchard Cove Trail, Lory State Park, CO  

Texas vervain (Verbena halei) -- in April -- Big Bend National Park, Texas       red & pink  ​      

swamp verbena (Verbena hastata) -- in August -- Lory State Park, CO           blue & purple               

swamp verbena (Verbena hastata) -- in August -- Tanglewood, Fort Collins Natural Area, CO  

MacDougal vervain (Verbena macdougalii) -- in September -- Cloudcroft, Lincoln National Forest, NM     blue & purple    ​