Arnica sororia

Species of flowering plant

Arnica sororia

Scientific classification
Kingdom:  | Plantae
Clade:  | Tracheophytes
Clade:  | Angiosperms
Clade:  | Eudicots
Clade:  | Asterids
Order:  | Asterales
Family:  | Asteraceae
Genus:  | Arnica
Species:  |

A. sororia

Binomial name
Arnica sororia

Greene

Arnica sororia is a North American species of flowering plant known by the common name twin arnica.[1] It is native to Western Canada (British Columbia, Alberta, Saskatchewan) and the Western United States (Washington, Oregon, California, Nevada, Utah, Idaho, Montana, Wyoming, South Dakota).[2] It grows in grasslands and in conifer forests,[3] as well as the sagebrush steppe.[4]

Arnica sororia is a rhizomatous perennial herb producing one or more hairy, glandular stems 10 to 50 centimeters (4 to 19+1⁄2 in) tall. There are a few to several pairs of broadly lance-shaped leaves along the stem,[4] the lower ones borne on petioles. Leaves may reach up to 14 cm long.[5]

The inflorescence consists of a daisy-like flower head, rarely more than one per stem.[4] These are lined with phyllaries coated in glandular hairs. The flower head has a center of glandular yellow disc florets and a fringe of yellow ray florets. The fruit is an achene a few millimeters long with a white pappus.[5]

## References

[edit]

1. ^ Calflora taxon report, University of California, Arnica sororia E. Greene, twin arnica
2. ^ Biota of North America Program 2014 county distribution map
3. ^ Flora of North America Vol. 21 Page 370 Twin arnica Arnica sororia Greene
4. ^ a b c Taylor, Ronald J. (1994) [1992]. Sagebrush Country: A Wildflower Sanctuary (rev. ed.). Missoula, MT: Mountain Press Pub. Co. p. 158\. ISBN 0-87842-280-3. OCLC 25708726.
5. ^ a b Greene, Edward Lee 1910. Ottawa Naturalist 23(12): 213

## External links

[edit]

* Jepson Manual Treatment
* United States Department of Agriculture Plants Profile
* Calphotos Photo gallery, University of California

Taxon identifiers

Arnica sororia|

* Wikidata: Q2863310
* Wikispecies: Arnica sororia
* Calflora: 692
* CoL: GT63
* CNPS: 3019
* EoL: 849130
* FNA: 250066127
* GBIF: 5405982
* GRIN: 409583
* iNaturalist: 75579
* IPNI: 20089-2
* IRMNG: 10203727
* ITIS: 36576
* NatureServe: 2.151397
* NCBI: 436213
* Open Tree of Life: 416926
* Plant List: gcc-100883
* PLANTS: ARSO2
* POWO: urn:lsid:ipni.org:names:20089-2
* Tropicos: 2701750
* VASCAN: 2874
* WFO: wfo-0000000926
* WoRMS: 1102707