Anemopsis is a monotypic genus in the lizard tail family (Saururaceae), containing a single species, Anemopsis californica, commonly known as yerba mansa or lizard tail. As a perennial herb adapted to saturated soils, it thrives in wet, alkaline marshes, streambanks, and creek edges where few other plants compete. The genus belongs to the order Piperales and is native to the arid and semi-arid wetlands of southwestern North America.
Anemopsis californica bears distinctive white-bracted flower spikes that superficially resemble those of its relatives in the lizard tail family. The plant spreads by rhizomes, forming dense mats in riparian corridors from California east to Oklahoma and Texas, and north to Kansas and Oregon, as well as northwest Mexico.
Yerba mansa has a long history of use among Indigenous peoples and traditional communities of the American Southwest and northern Mexico. The roots and leaves carry antimicrobial and anti-inflammatory compounds and have been employed to treat sore throats, swollen gums, rheumatic conditions, and skin infections. The plant's ethnobotanical significance has made it one of the better-studied medicinal herbs of the Chihuahuan and Sonoran desert borderlands.
Etymology
The genus name Anemopsis derives from the Greek anemone (wind flower) and opsis (appearance or resemblance), referring to the superficial similarity of the flowering bracts to those of anemones. The common name yerba mansa is Spanish for "gentle herb" or "tame herb," reflecting its longstanding role in traditional medicine of the Spanish-speaking Southwest.
Distribution
Anemopsis is native to southwestern North America, ranging from California east to Oklahoma and Texas, north to Kansas and Oregon, and south into northwest Mexico. It is restricted to wet, alkaline marshes, creek edges, and riparian corridors — habitats that are increasingly fragmented across the arid Southwest.
Ecology
Yerba mansa is a wetland specialist, requiring very wet or waterlogged, often alkaline soils. It colonises riparian margins, seasonal marshes, and alkali meadows, spreading by rhizomes to form dense low mats. Its tolerance of alkaline conditions gives it a competitive advantage in habitats that exclude most other herbaceous plants.
Cultural Uses
Anemopsis californica (yerba mansa) is one of the most widely used medicinal plants of the American Southwest borderlands. Traditional and folk practitioners prepare it as a tea, tincture, infusion, or dried powder to treat inflammation of mucous membranes, sore throat, and swollen gums. Root infusions act as a diuretic and are used to relieve gout and prevent kidney stones by reducing uric acid accumulation. Topically, powdered dried root is applied to athlete's foot and infected skin, while leaf poultices relieve muscle inflammation. Its broad-spectrum antimicrobial and antibacterial properties have sustained its role as a traditional midwifery herb in New Mexico and adjacent regions.
