Seeds of Asclepias tonkawae.

Skirt milkweed milkweed seeds.

Asclepias tonkawae is a newly described species of milkweed found in the sandy soils of Texas. For years, these plants were mistaken for their close relative Asclepias tomentosa, which grows in the southeastern United States. Careful study of their genetics and flower structures has now revealed that the Texas populations are distinct enough to stand on their own.

This species thrives in loose sands above the Carrizo and Sparta formations, an uncommon habitat that gives it a limited range. The name “tonkawae” honors the Tonkawa people, whose history is tied to the region where this plant is found.

Like other milkweeds, A. tonkawae produces clusters of intricate flowers and carries the ecological importance of providing resources for native insects, including pollinators. Because it was only recently recognized, much remains to be learned about its role in local ecosystems and its conservation needs.