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Montana, USA, CC BY-SA 2.0 <https://creativecommons.org/licenses/by-sa/2.0>, via Wikimedia Commons" href="https://commons.wikimedia.org/wiki/File:Helianthella_uniflora_(5384590185).jpg">Helianthella uniflora (5384590185)

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Campanulids
Ordo: Asterales

Familia: Asteraceae
Subfamilia: Asteroideae
Tribus: Heliantheae
Subtribus: Enceliinae
Genus: Helianthella
Species: Helianthella uniflora
Name

Helianthella uniflora (Nutt.) Torr. & A.Gray, Fl. N. Amer. (Torr. & A. Gray) 2: 334 334 1842.
Synonyms

Helianthella douglasii Torr. & A. Gray
Helianthella lanceolata Torr. & A. Gray
Helianthella multicaulis D.C.Eaton
Helianthella uniflora var. douglasii (Torr. & A.Gray) W.A.Weber
Helianthus uniflorus Nutt.
Leighia lanceolata Nutt.

Homonyms

Helianthella uniflora A. Gray = H. quinquenervis
(Hook.) A. Gray

Distribution
Native distribution areas:

Continental: Northern America
Canada (British Columbia, Arizona, Colorado, Idaho, Montana, Nevada, Oregon, Utah, Washington, Wyoming)

References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition
References

Torr. & A.Gray, A Flora of North America: containing . . . 2(2): 334. 1842.

Links

International Plant Names Index. 2018. Helianthella uniflora. Published online. Accessed: Feb. 04 2018.
The Plant List 2013. Helianthella uniflora in The Plant List Version 1.1. Published online. Accessed: 2018 Feb. 04.
Tropicos.org 2018. Helianthella uniflora. Missouri Botanical Garden. Published online. Accessed: 04 Feb. 2018.
Hassler, M. 2018. Helianthella uniflora. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2018. Species 2000 & ITIS Catalogue of Life. Published online. Accessed: 2018 Feb. 04. Reference page.
USDA, ARS, Germplasm Resources Information Network. Helianthella uniflora in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 07-Oct-06.

Vernacular names
English: Oneflower helianthella

Helianthella uniflora, the oneflower helianthella,[2] is a North American plant species in the family Asteraceae. It grows in the western United States and western Canada. It has been found from British Columbia south as far as northern Arizona and northern New Mexico.[3][4]

Helianthella uniflora is a herbaceous plant up to 120 cm (3.9 ft) tall. Leaves are up to 25 cm (9.8 in) long, each with 3 prominent veins running the length of the leaf. The plant usually produces only one yellow flower head per stem, though sometimes 2 or 3, the heads not nodding (hanging). Each head contains 11-21 bright yellow ray flowers surrounding numerous yellow disc flowers.[5]
References

The Plant List, Helianthella uniflora (Nutt.) Torr. & A. Gray
USDA, NRCS (n.d.). "Helianthella uniflora". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 20 July 2015.
Biota of North America Program 2014 county distribution map
SEINet, Southwestern Biodiversity, Arizona chapter includes photos, description, distribution map
Flora of North America, Helianthella uniflora (Nuttall) Torrey & A. Gray, 1842.

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