Quercus genus --- beech family

Gambel oak (Quercus gambelii var. gambelii) -- in July -- Gregory Canyon, Boulder County, CO

Gambel oak (Quercus gambelii var. gambelii) -- in April -- Arches National Park, UT        green & brown

Gambel oak (Quercus gambelii var. gambelii) -- in May -- Archuleta County, CO

gray oak (Quercus grisea) -- in September -- Organ Mountains-Desert Peaks National Monument, NM       green & brown

bur oak (Quercus macrocarpa) -- in February -- Spring Creek Trail, Fort Collins, CO   green & brown

Sonoran scrub oak (Quercus turbinella) -- in September -- Organ Mountains-Desert Peaks, NM    green & brown