Erigeron sionis is a North American species of flowering plant in the family Asteraceae known by the common name Zion fleabane.[2] It has been found in the southwestern United States, only in southern Utah. Some of the populations are inside Zion National Park, after which the species is named.[3][4]

Erigeron sionis grows in shallow soil in open woodlands dominated by pine, juniper, Douglas fir, maple, and oak. It is a perennial, colony-forming herb up to 25 cm (10 inches) tall, spreading by means of stolons running along the surface of the ground. The inflorescence generally contains 1-4 flower heads. Each head contains 22–46 white ray florets surrounding many yellow disc florets.[2][5]

Varieties[1][2]
  • Erigeron sionis var. sionis
  • Erigeron sionis var. trilobatus (Maguire ex Cronquist) S.L.Welsh

References

  1. ^ a b The Plant List, Erigeron sionis Cronquist
  2. ^ a b c Flora of North America, Erigeron sionis Cronquist, 1947. Zion fleabane
  3. ^ Biota of North America Program 2014 county distribution map
  4. ^ Zion Plant List, United States Department of the Interior, National Park Service
  5. ^ Nesom, Guy L. 1976. A new species of Erigeron (Asteraceae) and its relatives in southwestern Utah. Brittonia 28: 263-272 as Erigeron proselyticus