I am ashamed to admit that this photo came from the Univ. of Texas Ag department. I have one of my own..somewhere, but I couldn’t locate it on my hard drive.
Anyway! This sibling to milkweed is another excellent butterfly attracting native plant. The Asclepias genus is full of bright colored annuals (Mexican blood flower- has red and yellow flowers) as well as perennials, and all are attractive to butterflies, not just the commonly known milkweed.
Remember, a plant is only a weed because someone didn’t want it in their garden.