Helianthella quinquenervis

{{Short description|Species of flowering plant}}

{{Speciesbox

| image = Helianthella quinquenervis.jpg

| status = {{TNCStatus}}

| status_system = TNC

| genus = Helianthella

| species = quinquenervis

| authority = (Hook.) A.Gray 1883

| synonyms_ref = [http://www.theplantlist.org/tpl1.1/record/gcc-43145 The Plant List, Helianthella quinquenervis (Hook.) A. Gray ]

| synonyms = *Helianthus quinquenervis Hook. 1847

}}

Helianthella quinquenervis, the fivenerve helianthella,{{PLANTS|id=HEQU2|taxon=Helianthella quinquenervis|accessdate=20 July 2015}} is a North American plant species in the family Asteraceae. It grows in the mountains of the western United States and northern Mexico. This include the Rockies, the Black Hills, the ranges of the Great Basin, and the northern Sierra Madre, from Montana, Oregon, and South Dakota south as far as western Chihuahua and Coahuila.[http://bonap.net/MapGallery/County/Helianthella%20quinquenervis.png Biota of North America Program 2014 county distribution map][http://swbiodiversity.org/seinet/taxa/index.php?taxon=3787&taxauthid=1 SEINet, Southwestern Biodiversity, Arizona chapter] includes photos, description, distribution map[http://www.tropicos.org/ImageFullView.aspx?imageid=100013165 photo of herbarium specimen collected in Coahuila in 1985]

Helianthella quinquenervis is a herbaceous plant up to {{convert|150|cm|ft|abbr=on}} tall. Leaves are larger than those of most related species, up to {{convert|50|cm|in|abbr=on}} long, each with 3 or 5 prominent veins running the length of the leaf. The plant usually produces only one yellow flower head per stem, nodding (hanging). Each head contains 8-21 bright yellow ray flowers surrounding numerous yellow disc flowers.[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250066866 Flora of North America, Helianthella quinquenervis (Hooker) A. Gray, 1883. ]