Rigiopappus

Rigiopappus is a genus of North American plants in the tribe Astereae within the family Asteraceae. It is closely related to genus Pentachaeta.

The only known species is Rigiopappus leptocladus, sometimes known as wireweed. It is an annual plant sending up slender stems terminating in small daisylike yellow flowers. It is native to the western United States (California, Nevada, Oregon, Washington, Idaho).
 * Species