Achyrachaena is a monotypic genus in the family Asteraceae (order Asterales), containing a single species: Achyrachaena mollis, commonly known as blow-wives. It is a slender annual herb native to western North America, typically reaching about 30 centimetres in height on a strong, erect stem.
The plant produces a large, rounded bud that opens into a spherical cluster of flowers. The individual florets are small and yellow, but they are largely concealed by the genus's most distinctive feature: the showy, silky-white pappus scales of the developing fruits. These broad, bright-white scales spread outward like elongated petals and function as a wind-sail, carrying the single-seeded fruits (cypselas) away from the parent plant — a mechanism that gives rise to the common name "blow-wives."
Achyrachaena mollis grows in low-elevation coastal hills, inland valleys, grasslands, and lower mountain slopes across California from the Pacific coast to the foothills of the Sierra Nevada, with its range extending north into southern Oregon and south into northern Baja California, Mexico. Although the species has some invasive potential when introduced outside its native range, it is not regarded as a serious weed.
Distribution
Achyrachaena mollis occurs across California from the coast to the foothills of the Sierra Nevada, extending north into southern Oregon and south into northern Baja California, Mexico. It grows in low-elevation hills, valleys, grasslands, and lower mountain slopes.
Ecology
Fruits are dispersed by wind via broad, silky-white pappus scales that act as sails, carrying single-seeded cypselas from the parent plant. The species has some invasive potential in areas outside its native range but is not recorded as a particularly troublesome weed.
Taxonomy Notes
Achyrachaena is monotypic, containing only Achyrachaena mollis Schauer. It is placed in the family Asteraceae, order Asterales, and its single accepted species is the sole descendant recognised by GBIF. The genus name is treated as both singular and plural.
