Sumac family (anacardiaceae)
skunkbrush (Rhus aromatica var. trilobata) -- in April -- Waterfall Trail, Lory State Park, CO yellow & orange
skunkbrush (Rhus aromatica var. trilobata) -- in August -- Orchard Cove Trail, Lory State Park, CO yellow & orange
smooth sumac (Rhus glabra) -- in July -- Rist Canyon, Roosevelt National Forest, CO red & pink
smooth sumac (Rhus glabra) -- in July -- Gregory Canyon, Boulder County, CO
smooth sumac (Rhus glabra) -- in September -- Arthur's Rock Trail, Lory State Park, CO
littleleaf sumac (Rhus microphylla) -- in April -- Dripping Springs Natural Area, NM white & cream
staghorn sumac (Rhus tyhpina) -- in May -- Ted's Place, Larimer County foothills red & pink
staghorn sumac (Rhus typhina) -- in May -- Cathy Fromme Prairie, Fort Collins Natural Area, CO
western poison ivy (Toxicodendron rydbergii) -- in May -- Lory State Park, CO green & brown
western poison ivy (Toxicodendron rydbergii) -- in August -- Timber Trail, Lory State Park, CO