1. Family Apocynaceae The Dogbane Family
Alex Stalboerger

2. Apocynaceae 1500 species 424 genera 5 subfamilies
Most species are tropical or subtropical. But some species grow in xeric environments.
All are flowering plants that includes, trees, shrubs, herbs, and lianas.

3. North American Geographical Distribution

4. Apocynum androsaemifolium
Leaf margin is entire, veination is alternate, and oval leaves.
Flowers are tiny, pink, bell-shaped, near the branch tips. Smell like lilac.
Milky juice exudes from broken stems and leaves.

5. Sources http://www.wildflower.org/plants/result.php?id_plant=APAN2
All images have URL at bottom