Crataegus genus --- rose subfamily 1 

black hawthorn (Crataegus douglasii) -- in July -- Grand Teton National Park, WY          ​white & cream 

river hawthorn (Crataegus rivularis) -- in May -- Archuleta County, CO      ​white & cream 

fleshy hawthorn (Crataegus succulenta) -- in May -- Lory State Park, CO            white & cream       

fleshy hawthorn (Crataegus succulenta) -- in August -- Orchard Cove Trail, Lory State Park, CO

fleshy hawthorn (Crataegus succulenta) -- in April -- South Mesa Trailhead, Boulder County, CO

fleshy hawthorn (Crataegus succulenta) -- in September -- Well Gulch Nature Trail, Lory State Park, CO

fleshy hawthorn (Crataegus succulenta) -- in May -- Gustav Swanson, Fort Collins Natural Area, CO    ​    white & cream