Erigeron subtrinervis, called the three-nerved daisy,[3] the three-nerve fleabane,[4] or the hairy showy daisy,[4] is a North American species of flowering plants in the family Asteraceae. It grows in various mountains of western Canada and the western United States: Rocky Mountains, northern Cascades, Black Hills, etc., from British Columbia and Washington state east to North Dakota and south as far as New Mexico.[5][3]

Erigeron subtrinervis grows in openings and along roadsides in aspen groves and conifer forests, as well as on ridges and mountain peaks at high elevations. It is a perennial herb up to 90 cm (3 feet) tall, producing underground rhizomes and a woody caudex. The inflorescence generally contains 1-21 flower heads per stem, in a flat-topped array. Each head contains 100–150 purple or lavender ray florets surrounding many yellow disc florets.[6]

References

  1. ^ Tropicos, Erigeron glabellus var. mollis A. Gray
  2. ^ The Plant List, Erigeron subtrinervis Rydb. ex Porter & Britton
  3. ^ a b Turner Photographics, Wildflowers of the Pacific Northwest, Erigeron subtrinervis, Three-Nerved Daisy photos, description, distribution map for Oregon, Washington, and southern British Columbia
  4. ^ a b Lady Bird Johnson Wildflower Center, University of Texas, Erigeron subtrinervis Rydb. ex Porter & Britton Three-nerve fleabane, Hairy showy daisy
  5. ^ Biota of North America Program 2014 county distribution map
  6. ^ Flora of North America, Erigeron subtrinervis Rydberg ex Porter & Britton, 1894.

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