Asclepias genus --- dogbane family
spider milkweed (Asclepias asperula ssp. asperula) -- in April -- Dripping Springs Natural Area, NM
Engelmann's milkweed (Asclepias engelmanniana) -- in August -- Orchard Cove Trail, Lory State Park, CO green & brown
narrow-leaved milkweed (Asclepias fascicularis) -- in July -- Lava Beds National Monument, OR red & pink
swamp milkweed (Asclepias incarnata) -- in August -- High Plains Environmental Center, Loveland, CO red & pink
swamp milkweed (Asclepias incarnata) -- in August -- Redwing Marsh, Fort Collins Natural Area, Larimer County, CO
dwarf milkweed (Asclepias macrosperma) -- in April -- Arches National Park, UT yellow & orange
plains milkweed (Asclepias pumila) -- in August -- Arthur's Rock Trail, Lory State Park white & cream
plains milkweed (Asclepias pumila) -- in August -- South Valley Loop Trail, Lory State Park, CO
showy milkweed (Asclepias speciosa) -- in July -- in Bellvue, Larimer County Foothills, CO red & pink
showy milkweed (Asclepias speciosa) -- in June -- Saint Vrain State Park, CO
showy milkweed (Asclepias speciosa) -- in August -- South Valley Loop Trail, Lory State Park, CO
showy milkweed (Asclepias speciosa) -- in September -- Big Thompson Ponds State Wildlife Area, CO
slimleaf milkweed (Asclepias stenophylla) -- in July -- Boulder County, CO white & cream
slimleaf milkweed (Asclepias stenophylla) -- in June -- South Valley Loop Trail, Lory State Park, CO
horsetail milkweed (Asclepias subverticillata) -- in June -- near Wray, Yuma County, CO white & cream
horsetail milkweed (Asclepias subverticillata) -- in September -- White Sands National Monument, NM
green comet milkweed (Asclepias viridiflora) -- in July -- Satanka Cove Trail, Lory State Park, CO green & brown
green comet milkweed (Asclepias viridflora) -- in August -- Soldier Canyon, Lory State Park, CO