Erigeron poliospermus

Erigeron poliospermus is a species of flowering plant in the daisy family known by the common names gray-seeded fleabane[1] and purple cushion fleabane.[2] Native to western North America, it is mainly found in east of the Cascade Range in Washington, Oregon, and Idaho. A species of desert, scrub and rocky habitats below 1,800 metres (6,000 ft), it occasionally found at higher elevations.[3][4][5]

Erigeron poliospermus
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Asterids
Order:
Asterales
Family:
Asteraceae
Tribe:
Astereae
Genus:
Erigeron
Species:
E. poliospermus
Binomial name
Erigeron poliospermus

Erigeron poliospermus is a small perennial herb rarely more than 15 cm (5.9 in) tall, producing a woody taproot. The plant generally produces only 1-3 flower heads per stem. Each head has 15–45 pink, purple, or white ray florets surrounding numerous yellow disc florets. The ray florets are lacking in var. disciformis. The involucre bracts, 5–9 mm (0.2–0.4 in) long, are more or less the same length and are sparsely to densely white-hairy.[1][6][7][8][9]

Varieties
  • Erigeron poliospermus var. cereus Cronquist - Washington
  • Erigeron poliospermus var. disciformis (Cronquist) G.L.Nesom - Washington, Oregon[10]
  • Erigeron poliospermus var. poliospermus - British Columbia, Washington, Idaho, Oregon

References
  1. Flora of North America, Erigeron poliospermus A. Gray 1884.
  2. "Erigeron poliospermus". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 29 June 2015.
  3. Biota of North America Program 2014 county distribution map
  4. Sullivan, Steven. K. (2020). "Erigeron poliospermus". Wildflower Search. Retrieved 2020-09-22.
  5. USDA, NRCS. (2020). "Erigeron poliospermus". The PLANTS Database. National Plant Data Team, Greensboro, NC 27401-4901 USA. Retrieved 2020-09-22.
  6. Cronquist, A.J. 1994. Asterales. 5: 1–496. In A.J. Cronquist, A. H. Holmgren, N. H. Holmgren, J. L. Reveal & P. K. Holmgren (eds.) Intermountain Flora. Hafner Pub. Co., New York.
  7. Scoggan, H. J. 1979. Dicotyledoneae (Loasaceae to Compositae). Part 4. 1117–1711 pp. In Flora of Canada. National Museums of Canada, Ottawa.
  8. Klinkenberg, Brian (Editor) (2020). "Erigeron poliospermus". E-Flora BC: Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. Retrieved 2020-09-22.CS1 maint: extra text: authors list (link)
  9. Giblin, David (Editor) (2020). "Erigeron poliospermus". WTU Herbarium Image Collection. Burke Museum, University of Washington. Retrieved 2020-09-22.CS1 maint: extra text: authors list (link)
  10. Nesom, Guy L. 2004. Sida 21(1): 24
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