chamissonis

Chamissonis is a genus of flowering plants in the family Asteraceae. The genus was named to honor the 19th-century German botanist Adelbert von Chamisso, who collected plants in the Pacific Northwest and surrounding regions. In various taxonomic treatments, Chamissonis has been described as containing a small number of species native to western North America.

Description and characteristics: Plants placed in Chamissonis are typically herbaceous perennials with simple leaves and an overall growth habit common to many Asteraceae. The inflorescences are composite heads (capitula) that, like other members of the family, comprise florets arranged to form showy flower heads. Colors and exact floral morphology can vary among species within the genus.

Distribution and habitat: Chamissonis species are native to western North America, with occurrences reported from regions ranging from coastal areas to montane environments. They are often found in meadows, open slopes, and woodland margins where conditions accommodate herbaceous perennials.

Taxonomy and status: The circumscription of Chamissonis has varied over time. Some taxonomic treatments have included only a few species, while others have reclassified certain species into related genera as molecular and morphological studies clarified relationships within Asteraceae. The name remains tied to historical botanical work associated with Chamisso.

See also: Adelbert von Chamisso; Asteraceae.