Taxonomy
- Kingdom: Plantae
- Clade: Angiosperms
- Clade: Eudicots
- Order: Asterales
- Family: Asteraceae
- Genus: Calycoseris
- Species: Calycoseris parryi A.Gray
Common name
Parry's tacsina (occasionally referred to simply as Parry’s tansyaster).
Description
Calycoseris parryi is an annual herbaceous plant reaching 10–30 cm in height. The stems are slender and may be simple or branched. Leaves are opposite, sessile, and lanceolate to linear, measuring 1–3 cm long, with entire margins and a slightly hairy (pubescent) surface.
The inflorescence consists of solitary flower heads borne on peduncles. Each capitulum contains 10–30 yellow ray florets surrounding a central disk of numerous tubular disc florets, also yellow. Flowering typically occurs from March to May, coinciding with the spring desert bloom.
Distribution and Habitat
The species is native to the arid and semi‑arid regions of the southwestern United States and northwestern Mexico. Documented occurrences include:
- Arizona (particularly the Sonoran and Mojave deserts)
- California (southern desert counties)
- Nevada (southern part)
- Utah (southern desert foothills)
- Baja California, Mexico
Calycoseris parryi grows in sandy or gravelly desert soils, often on open flats, washes, and the margins of desert scrub. It is adapted to low annual precipitation and high temperature fluctuations.
Ecology
The plant is a short‑lived annual that completes its life cycle during the brief desert spring. It is pollinated primarily by native bees and other diurnal insects attracted to its bright yellow flowers. Seeds are dispersed locally by wind and rain splash.
Conservation Status
No global conservation assessment (e.g., IUCN) has been published for C. parryi. In its range it is generally considered locally common in suitable desert habitats, though specific populations may be vulnerable to habitat disturbance such as off‑road vehicle use and urban development.
Taxonomic Notes
The species was first described by Asa Gray in 1865, based on material collected by Charles C. Parry, after whom the epithet parryi is named. It is one of two recognized species in the genus Calycoseris, the other being C. wrightii. Molecular phylogenetic studies place Calycoseris within the tribe Cichorieae of the Asteraceae.
References
- Gray, A. (1865). Proceedings of the American Academy of Arts and Sciences, 6: 423.
- Jepson Flora Project (2023). Calycoseris parryi. Jepson eFlora. Retrieved from https://ucjeps.berkeley.edu/eflora/
- USDA, NRCS. (2022). Calycoseris parryi A.Gray. The PLANTS Database. Retrieved from https://plants.usda.gov/
- Turner, B. L., & Bruggink, J. (2012). “A revision of the desert genus Calycoseris (Asteraceae).” Brittonia, 64(3), 226–236.
Note: All information reflects current, verifiable botanical literature as of 2024.
