soapberry family (Sapindaceae)
Rocky Mountain maple (Acer glabrum var. glabrum) -- in April -- Well Gulch Nature Trail, Lory State Park, CO green & brown
Rocky Mountain maple (Acer glabrum var. glabrum) -- in July -- Young Gulch, Poudre Canyon, Larimer County, CO
Rocky Mountain maple (Acer glabrum var. glabrum) -- in July -- Gregory Canyon, Boulder County, CO
Rocky Mountain maple (Acer glabrum var. glabrum) -- in January -- Well Gulch Nature Trail, Lory State Park, CO
Rocky Mountain maple (Acer glabrum var. glabrum) -- in January -- Well Gulch Nature Trail, Lory State Park, CO
boxelder (Acer negundo) -- in May -- Gustav Swanson Natural Area, Fort Collins, CO green & brown
boxelder (Acer negundo) -- in April -- Towhee Trail, South Mesa Trailhead, Boulder County, CO
boxelder (Acer negundo) -- in April -- Poudre Valley Trail, Weld County, CO
boxelder (Acer negundo) -- in May -- CSU Environmental Learning Center, Fort Collins, CO
boxelder (Acer negundo) -- in February -- Gustav Swanson Natural Area, Fort Collins, CO
boxelder (Acer negundo) -- in September -- Gustav Swanson, Fort Collins Natural Area, CO
boxelder (Acer negundo var. interius) -- in May -- Archuleta County, CO
silver maple (Acer saccharinum) -- in September -- Gateway Natural Area, Fort Collins, CO
horse chestnut (Aesculus hippocastanum) -- in May -- Boulder, CO white & cream
red buckeye (Aesculus pavia) -- in April -- Crowley's Ridge State Park, AR red & pink