In the summer it’s easy to spot a stand of horsetail milkweed (Asclepias subverticillata) along the side of the road with its slender leafed...
The genus Asclepias is in the Milkweed family Aclepiadaceae and there are about 30 species of Asclepias found in Arizona from low deserts to...
The San Pedro River in southeastern Arizona “provides critical stopover habitat for millions of migrating birds each year and is home to 84 species...