Arnica sororia is a North American species of flowering plant known by the common name twin arnica.Calflora taxon report, University of California, Arnica sororia E. Greene, twin arnica 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).Biota of North America Program 2014 county distribution map It grows in grasslands and in conifer forests,Flora of North America Vol. 21 Page 370 Twin arnica Arnica sororia Greene as well as the sagebrush steppe. Arnica sororia is a rhizomatous perennial herb producing one or more hairy, glandular stems 10 to 50 cm tall. There are a few to several pairs of broadly lance-shaped leaves along the stem, the lower ones borne on petioles. Leaves may reach up to 14 cm long.Greene, Edward Lee 1910. Ottawa Naturalist 23(12): 213 The inflorescence consists of a daisy-like flower head, rarely more than one per stem. 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.
No narrative description available for this taxon yet.
Compounds documented for Arnica sororia across natural-product and food-composition databases — not just the ~150 nutrients on a classic label ("nutritional dark matter").
Compound class profile2 classes
Flavonols2
Flavones2
Documented compounds4 total
Compound
Class
Amount
Source
Apigenin
present
LOTUS
Astragalin
present
LOTUS
Hyperin
present
LOTUS
Luteolin 7-glucoside
present
LOTUS
05DNA & barcoding7 specimens
A DNA barcode is a short, standardised stretch of genes that works like a fingerprint — enough to tell one species from another. Below is the molecular trace Arnica sororia has left across the world's sequence archives.
At a glance
DNA specimens7
Marker genes4
GenBank sequences6
eDNA detections4
Countries2
The DNA barcodea real sequence read deposited for this species
★ the standard DNA barcode for this group — the short region actually read to tell this species apart. The rest are extra genes sequenced along the way.
★rbcL3★rbcLa★ITS3★ITS2
plant barcodefungal barcode
06Genome at a glanceCCDB
The complete instruction manualArnica sororia carries — its genome. We read it from three angles — how big it is, how the DNA is packed into chromosomes, and how completely it has been sequenced — and explain how to read each value as you go.
Chromosomes & ploidyhow the DNA is packaged
2n is the full chromosome count in a normal body cell; n is a gamete (egg or sperm), which carries half. Ploidy is how many complete chromosome sets each cell holds — 2× (diploid) is typical for animals, while higher levels (polyploidy) are common in plants. Click any value below to see the underlying records and sources.
CCDB · book-atlas-flowering-plants — B0cher & L. 1950
n 192×CCDB · book-ipcn67-71
CCDB · book-ipcn67-71 — BARKER, W.W. 1967. In IOPB chromosome number reports X. Taxon 16: 146-157.
CCDB · book-ipcn67-71 — ORNDUFF, R., T. MOSQUIN, D. W. KYHOS, & P. H. RAVEN. 1967. Chromosome numbers in Compositae. VI. Senecioneae. II. Am. Jour. Bot. 54: 205-213.
Ploidy records — measured levels and diploid/polyploid inferences · click for sources
Human sightings and records, or camera-trap / sensor detections — someone (or a device) saw or captured the species in the wild.
Coordinate accuracy92% within 1 km
≤100 m 44≤1 km 2≤10 km 2>10 km 2
50 georeferenced · 17 without coordinates
Open the mapobservation + sensor67
Museum / Voucheredphysical evidence
Backed by a physical specimen — a herbarium sheet, sample or voucher held in a collection. “Vouchered” means supported by material evidence, not just an observation.
Coordinate accuracy47% within 1 km
≤100 m 74≤1 km 133≤10 km 193>10 km 37
437 georeferenced · 437 without coordinates
Open the institutions mapphysical evidence874
Wildobservation + sensor
Human sightings and records, or camera-trap / sensor detections — someone (or a device) saw or captured the species in the wild.
10Collections & institutions
Holding institutions43 of 62 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
Institution
Specimens
WTUlocation not on record
85
Bronx, US
84
Pullman, US
78
Corvallis, US
59
University of Alberta Museumslocation not on record
57
Missoula, US
57
Caldwell, US
57
Moscow, US
53
Bozeman, US
48
Boise, US
36
Wuzhou, CN
23
Logan, US
23
Pocatello, US
22
Provo, US
20
Vancouver, CA
19
DOI/NPS, Little Rock Central High School National Historic Sitelocation not on record
12
Riverside, US
10
CASlocation not on record
10
Henderson, US
9
Cheney, US
7
University of Stellenboschlocation not on record
6
VALElocation not on record
6
Claremont, US
6
Davis, US
6
Pittsburg, US
5
Chongqing Museumlocation not on record
5
DOI/NPS, Craters of the Moon National Monument & Preservelocation not on record
4
Santa Barbara, US
4
Spearfish, US
3
INFlocation not on record
3
Musee des Dinosaures d'Esperaza (Aude)location not on record
3
University of Lethbridgelocation not on record
3
Madison, US
2
Chadron, US
2
Arcata, US
2
Moscow State Universitylocation not on record
2
Phoenix, US
2
Museo civico La Terra e l'Uomo di Crocetta del Montellolocation not on record
2
Bangkok, TH
2
San Luis Obispo, US
2
Ashland, US
2
Flagstaff, US
2
Canadian Department of Agriculturelocation not on record
2
Toronto, CA
1
AUAlocation not on record
1
Clemson, US
1
Uppsala, SE
1
DOI/NPS, Greenbelt Parklocation not on record
1
Angwin, US
1
Saint Louis, US
1
Portland, US
1
Royal Ontario Museum, Green Plant Herbarium (TRT)location not on record
1
Victoria, CA
1
SEFlocation not on record
1
Turku, FI
1
Columbia, US
1
Kew, GB
1
Beijing, CN
1
Weber State Universitylocation not on record
1
Bend, US
1
San Francisco, US
1
Chapel Hill, US
1
62 institutions · 864 of 874 vouchered records shown · 10 without an institution code
09Environmental DNA4 detections
Where the DNA of Arnica sororia was picked up in samples of water, soil or air — nobody saw the organism, only its DNA left behind. A trace is a clue that the species was near, not a confirmed sighting.
Signal
Detections DNA found4
Studies independent surveys1
Countries1
Signal confidence: weakweighed across independent studies, places & mapped detections
Where its DNA was found
0 of 4 detections have coordinates
Open the map1 country0
On grassy slopes on limestone bluffs.In pine woods.
How strong is each trace?
DNA read depthRead counts were not reported for this species — the map shows presence only, not how strong each trace was.
Modelled climatemodelled
−15°Ctemperature across detection sites+40°C
Temperature median10.2 °C 10.2–10.2
Seasonal swing summer↔winter22.4 °C
Max temp (day)16.6 °C
Min temp (night)3.80 °C
Precipitation79.4 mm/mo
Air humidity51.4 %
Moisture balance-33.9 mm/mo
Vapour deficit609 Pa
Wind speed2.40 m/s
Cloud cover39.6 %
CHELSA 1981–2010, ~9 km grid, at location & month of 1 detection point · median with p10–p90 · reflects where sampling happened, not only the true niche
How to read this: each dot is one detection of this species' DNA in an environmental sample. The confidence meter weighs how many independent studies and places back up the signal — one detection in one study is a hint; many across several studies is solid. Records dated before 2008 (when eDNA methods began) are treated as likely mislabeled and left off the map.
WikipediaWikimedia Foundation3 languages↗
BioWikiNetmultilingual Wikipediamultilingual↗
GBIFGlobal Biodiversity Information Facility941 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI4 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics7 specimens↗
NCBIUS National Library of Medicinesequences↗
LOTUSNatural Products (Wikidata)compounds↗
GRIN TaxonomyUSDA-ARSdistribution & uses↗
Open Tree of LifeOpenTreephylogeny backbone↗
CCDBChromosome Counts DB · Tel Aviv U.genome & karyotype↗
PloiDBPloidy Databasegenome & karyotype
GLoBIGlobal Biotic Interactionsbiotic interactions↗