One of the most important of these is asclepias, commonly known as milkweed.
From the sfgate.com
Asclepias curassavica is available in 4-inch pots at your local nursery.
From the sfgate.com
Asclepias curassavica, or milkweed, features star-shaped flowers from red, above, to pale pink, below.
From the sfgate.com
Are my milkweed and asclepias tuberosa overwatered?
From the chron.com
Various asclepias species, most notably A. curassavica, are vital host plants for our local monarch butterflies.
From the sfgate.com
Combine with other hummingbird-attracting plants like the Silky Gold asclepias, Brazilian sage or bog sage, or for a real showstopper plant it with Mystic Spires blue salvia.
From the sacbee.com
More examples
Genus of chiefly North American perennial herbs: silkweed; milkweed
Asclepias L. (1753), the milkweeds, is a genus of herbaceous perennial, dicotyledonous plants that contains over 140 known species. It previously belonged to the family Asclepiadaceae, but this is now classified as the subfamily Asclepiadoideae of the dogbane family Apocynaceae.