Dogbane family (Apocynaceae)
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tubular bluestar (Amsonia longiflora) -- in April -- Chihuahuan Desert Nature Center, TX blue & purple
spreading dogbane (Apocynum androsaemifolium) -- in June -- Gateway, Poudre Canyon, Roosevelt National Forest, CO red & pink
spreading dogbane (Apocynum androsaemifolium) -- in July -- Klamath Falls to Ashland (Rt. 66), OR red & pink
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Indian hemp (Apocynum cannabinum) -- in June -- Pineridge Natural Area, Fort Collins, CO white & cream
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gynostegium
Indian hemp (Apocynum cannabinum) -- in June -- Watson Lake State Wildlife Area, CO
Indian hemp (Apocynum cannabinum) -- in July -- Magpie Meander, Fort Collins Natural Area, Larimer County, CO
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spider milkweed (Asclepias asperula) -- in April -- Big Bend Ranch State Park, TX green & brown
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spider milkweed (Asclepias asperula ssp. asperula) -- in April -- Dripping Springs Natural Area, NM
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Engelmann's milkweed (Asclepias engelmanniana) -- in August -- Orchard Cove Trail, Lory State Park, CO green & brown
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narrow-leaved milkweed (Asclepias fascicularis) -- in July -- Lava Beds National Monument, OR red & pink
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swamp milkweed (Asclepias incarnata) -- in August -- High Plains Environmental Center, Loveland, CO red & pink
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swamp milkweed (Asclepias incarnata) -- in August -- Redwing Marsh, Fort Collins Natural Area, Larimer County, CO
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dwarf milkweed (Asclepias macrosperma) -- in April -- Arches National Park, UT yellow & orange
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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
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showy milkweed (Asclepias speciosa) -- in July -- in Bellvue, Larimer County Foothills red & pink
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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
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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
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horsetail milkweed (Asclepias subverticillata) -- in June -- near Wray, Yuma County, CO white & cream
horsetail milkweed (Asclepias subverticillata) -- in September -- White Sands National Monument, NM
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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
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Hartweg's twinevine (Funastrum cynanchoides var. heterophyllum) -- in April -- Big Bend Ranch State Park, TX red & pink
