Birch family (Betulaceae)
thinleaf alder (Alnus incana ssp. tenuifolia) -- in June -- Phantom Canyon Preserve, CO green & brown
thinleaf alder (Alnus incana ssp. tenuifolia) -- in September -- Nix, Fort Collins Natural Area, CO
water birch (Betula occidentalis) -- in June -- Well Gulch Nature Trail, Lory State Park, Larimer County, CO
water birch (Betula occidentalis) -- in September -- Gateway Natural Area, Fort Collins, CO
water birch (Betula occidentalis) -- in October -- Well Gulch Nature Trail, Lory State Park, CO
beaked hazelnut (Corylus cornuta var. cornuta) -- in October -- Waterfall Trail, Lory State Park, CO
beaked hazelnut (Corylus cornuta var. cornuta) -- in October -- Arthur's Rock Trail, Lory State Park, CO