Erigeron subtrinervis

{{Short description|Species of flowering plant}}

{{Speciesbox

|image = Erigeron subtrinervis 3158 - Flickr - andrey zharkikh.jpg

|image_caption =

|status = {{TNCStatus}}

|status_system = TNC

|genus = Erigeron

|species = subtrinervis

|authority = Rydb. ex Porter & Britton

|synonyms_ref = [http://www.theplantlist.org/tpl1.1/record/gcc-6381 The Plant List, Erigeron subtrinervis Rydb. ex Porter & Britton ]

|synonyms =

• Erigeron glabellus var. mollis A.Gray
• Erigeron glabellum var. molle A.Gray[http://www.tropicos.org/Name/50076521 Tropicos, Erigeron glabellus var. mollis A. Gray]
• Erigeron bakeri Wooton & Standl.
• Erigeron incanescens Rydb.
• Erigeron speciosus var. mollis (A.Gray) S.L.Welsh

}}

Erigeron subtrinervis, called the three-nerved daisy, the three-nerve fleabane, or the hairy showy daisy,[http://www.wildflower.org/plants/result.php?id_plant=ERSU2 Lady Bird Johnson Wildflower Center, University of Texas, Erigeron subtrinervis Rydb. ex Porter & Britton Three-nerve fleabane, Hairy showy daisy] 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.[http://bonap.net/MapGallery/County/Erigeron%20subtrinervis.png Biota of North America Program 2014 county distribution map][http://www.pnwflowers.com/flower/erigeron-subtrinervis Turner Photographics, Wildflowers of the Pacific Northwest, Erigeron subtrinervis, Three-Nerved Daisy] photos, description, distribution map for Oregon, Washington, and southern British Columbia

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.[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250066684 Flora of North America, Erigeron subtrinervis Rydberg ex Porter & Britton, 1894. ]