Liatris Gaertn. ex Schreb. is a genus of more than 40 perennial flowering plants in the family Asteraceae (tribe Eupatorieae), native exclusively to North America. The genus is widely known by the common names blazing star and gayfeather, with some species also called button snakeroot or colicroot. GBIF recognizes 110 species and infraspecific taxa within the genus.
The plants are distinctive in form: narrow, linear leaves emerge from underground corms that allow the plants to survive winter and re-sprout each spring. Flower spikes arise in summer and carry dense clusters of disc florets — unusually, they open from the top of the spike downward, producing a characteristic bottle-brush appearance in shades of pink, purple, and white. Unlike most composites, Liatris flower heads lack ray florets entirely.
The genus ranges from Canada south through the United States into Mexico and the Bahamas, with individual species occupying habitats from coastal plains to prairies, open woodlands, and rocky outcrops. Some species are highly localized — confined to a single state such as Florida or Texas — while others are broadly distributed across the Mississippi Valley and Great Lakes regions.
Liatris is closely related to Garberia, a monotypic Florida-endemic shrub in the subtribe Liatrinae. Its ornamental value is well established: several species and cultivars are widely grown in gardens and appear in the cut-flower trade.
Distribution
Liatris is native to North America, with a range spanning southern Canada, the United States, Mexico, and the Bahamas. The center of diversity lies in the eastern and central United States. Individual species differ considerably in range: some are broadly distributed across the Mississippi Valley and Great Lakes regions, while others are narrow endemics confined to single states such as Florida (e.g., L. ohlingerae, L. garberi) or Texas. No species is native outside the Americas.
Ecology
Liatris species occupy open, often fire-maintained habitats including prairies, savannas, open woodlands, roadsides, and coastal plains. The genus has strong associations with specialist pollinators: the flowers attract butterflies, native bees, and other nectar-seeking insects, making Liatris a recognized component of native pollinator gardens.
The genus also supports specialist herbivores: larvae of moths in the genus Schinia (family Noctuidae) use Liatris as food plants, and the flower moth Schinia sanguinea feeds exclusively on the genus. This tight relationship with specialist Lepidoptera illustrates the ecological importance of Liatris in eastern North American grassland and prairie communities.
Cultivation
Liatris is an adaptable, low-maintenance garden perennial suited to USDA hardiness zones 3a through 9b. It thrives in full sun to light shade and tolerates a range of soil textures including clay, loam, and sand, performing best in well-drained conditions. The plants are notably drought tolerant once established; conversely, they are prone to crown rot if grown in poorly drained or persistently wet soils over winter.
Corms should be planted approximately 5 inches deep and 6–8 inches apart. Mature plant height varies considerably by species, ranging from about 1 foot to 5 feet. Because the genus has no significant insect pest or disease problems, it is considered a reliable choice for low-input naturalistic plantings, native plant gardens, and butterfly gardens.
Propagation
The primary propagation method for established Liatris plants is division of the corms in early spring or after flowering. Seeds can also be sown in autumn (for natural cold stratification) or in early spring under greenhouse conditions. Basal cuttings taken as new growth emerges in spring represent a third option for vegetative increase. For commercial or long-term storage of dormant corms, refrigeration is recommended for any storage period exceeding three weeks.
Cultural & medicinal uses
Liatris species have documented medicinal properties in traditional and modern contexts. The plants contain liatrin, a compound with reported anticancer properties, though no clinical applications are established and professional medical guidance is advised before any medicinal use. Several species have considerable commercial value as cut flowers, where the long-lasting, colorful spikes are used in fresh and dried arrangements.
Taxonomy notes
The genus Liatris was formally described by Gaertner ex Schreber in 1791, published in Genera Plantarum (Gen. 542). It is placed in tribe Eupatorieae, family Asteraceae, within the subtribe Liatrinae — a group that also includes Trilisa and Carphephorus. The most closely related genus is Garberia, a monotypic Florida endemic, which differs from Liatris by its shrubby habit and distinct karyotype.
GBIF (usageKey 3104263) accepts the name Liatris Gaertn. ex Schreb. as the valid genus name with status "accepted." The genus contains 110 species and infraspecific taxa according to GBIF; the commonly cited figure for recognized species is approximately 40 or more distinct species, with several natural hybrids (marked ×) also described.
