euphorbia genus --- spurge family
whitemargin sandmat (Euphorbia albomarginata) -- in March -- Boyce Thompson Arboretum State Park, AZ white & cream
horned spurge (Euphorbia brachycera) -- in May -- Red Mountain Open Space, Larimer County Open Space, CO green & brown
horned spurge (Euphorbia brachycera) -- in May -- Neva Road/ 36, Boulder County, CO
cypress spurge (Euphorbia cyparissias) -- in July -- McMurry, Fort Collins Natural Area, Larimer County, CO
toothed spurge (Euphorbia dentata) -- in August -- Watson Lake State Wildlife Area, CO green & brown
Fendler's sandmat (Euphorbia fendleri) -- in April -- Arches National Park, UT white & cream
snow-on-the-mountain (Euphorbia marginata) -- in August -- Lefthand Canyon, Boulder, CO white & cream
snow-on-the-mountain (Euphorbia marginata) -- in August -- Fossil Creek Trail, Fort Collins, Larimer County, CO
myrtle spurge (Euphorbia myrsinites) -- in March -- South Valley Park, Jefferson County Open Space, CO green & brown
warty spurge (Euphorbia spathulata) -- in May -- Neva Road/ 36, Boulder County, CO green & brown
leafy spurge (Euphorbia virgata) -- in May -- Bellvue, Larimer County foothills green & brown
leafy spurge (Euphorbia virgata) -- in June -- Watson Lake State Wildlife Area, CO green & brown
leafy spurge (Euphorbia virgata) -- in April -- Timber Trail, Lory State Park, CO green & brown
leafy spurge (Euphorbia virgata) -- in April -- Poudre River Trail, Weld County, CO