Carex swanii, known as Swan's sedge or downy green sedge, is a species of flowering plant in the family Cyperaceae. It is native to eastern North America. It was originally described as Carex virescens var. swanii in 1906, then elevated to species in 1910. The species was named for Charles Walter Swan (1838-1921), a naval surgeon and early member of the New England Botanical Club.
No narrative description available for this taxon yet.
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 Carex swanii has left across the world's sequence archives.
At a glance
DNA specimens10
Marker genes5
GenBank sequences10
eDNA detections9
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.
★matK★rbcL6★rbcLa★ITS4★ITS2
plant barcodefungal barcode
07Deep time~3.22 Ma lineage
How far back this lineage goes — and how we know. Everything here is measured in Ma, short for “mega-annum”: millions of years ago. The chart reads left to right like a calendar of the Earth, from the deep past on the left to today at the right edgetop to bottom like a core drilled through the Earth, from the deep past at the top down to today at the bottom.
At a glance
DNA clock origin3.22 Ma TimeTree
When this lineage existed
How to read this: the coloured strip along the bottomdown the left is the geological calendar — the standard epochs (Pliocene, Pleistocene…) every museum uses, shown so you can see which chapter of Earth's history this lineage lived in. This lineage is a young one, so the strip is zoomed in to epochs — the finer subdivisions inside a period. The orange marker is the DNA clock: DNA accumulates mutations at a roughly steady rate, so comparing this species' DNA with its relatives estimates when the lineage split off — independently of any fossil.
DNA clock origin
08Occurrence & distribution
Record type3 710 records
Wild obs. + sensor1 310
Museum / vouchered2 400
Origin
Native2
Range
Area of Occupancy AOO11 348 km²
Wildobservation + sensor
Human sightings and records, or camera-trap / sensor detections — someone (or a device) saw or captured the species in the wild.
Coordinate accuracy70% within 1 km
≤100 m 656≤1 km 71≤10 km 24>10 km 283
1 034 georeferenced · 276 without coordinates
Open the mapobservation + sensor1 310
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 accuracy37% within 1 km
≤100 m 111≤1 km 389≤10 km 784>10 km 66
1 350 georeferenced · 1 050 without coordinates
Open the institutions mapphysical evidence2 400
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 institutions71 of 107 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
Institution
Specimens
Philadelphia, US
433
Bronx, US
295
Chongqing Museumlocation not on record
237
Oregon State Universitylocation not on record
96
Allentown, US
93
Bloomington, US
89
College Park, US
86
Ann Arbor, US
82
University of Stellenboschlocation not on record
71
Jackson, US
52
University of New Hampshirelocation not on record
52
Burlington, US
45
Saint Louis, US
40
Williamsburg, US
40
Philadelphia, US
38
Dover, US
35
Johnson City, US
32
Université Lavallocation not on record
31
Madison, US
30
Chicago, US
27
Morgantown, US
25
Tampa, US
19
New Haven, US
18
San Angelo, US
18
Québec, CA
15
Wuzhou, CN
14
McWane Science Centerlocation not on record
14
Little Rock, US
13
Chapel Hill, US
13
Museum of the Rockieslocation not on record
11
Keene State Universitylocation not on record
10
Millersville, US
9
Museo civico La Terra e l'Uomo di Crocetta del Montellolocation not on record
9
Norfolk, US
8
Bangkok, TH
8
Durham, US
8
Staten Island, US
7
Lord Fairfax Community Collegelocation not on record
7
Auckland, NZ
6
Maryland Department of Natural Resourceslocation not on record
5
DOI/NPS, Little Rock Central High School National Historic Sitelocation not on record
5
St. Paul, US
5
Provo, US
5
Fairfax, US
5
New Brunswick, US
5
DOI/NPS, Mississippi National River & Recreation Arealocation not on record
5
University of Tennessee at Chattanoogalocation not on record
5
University of Toronto Mississaugalocation not on record
5
Toronto, CA
4
Acadia Universitylocation not on record
3
Kingston, US
3
Montréal, CA
3
Knoxville, US
3
Richmond, US
3
University of Guelph, OAC Herbariumlocation not on record
3
Valdosta State Universitylocation not on record
3
Wlocation not on record
3
Phoenix, US
3
Riverside, US
3
Christchurch, NZ
3
Henderson, US
2
Elikins, US
2
Mississippi State, US
2
Montréal, CA
2
Black Rock Forest Consortiumlocation not on record
2
Whitewater, US
2
James F. Matthews Center for Biodiversity Studieslocation not on record
2
Flagstaff, US
2
Beijing, CN
2
Hamilton, US
2
Mohonk Preservelocation not on record
2
Delaware State University, Claude E. Phillips Herbariumlocation not on record
2
Dekalb, US
2
Boise, US
2
Fayetteville, US
2
Austin, US
2
Chicago, US
2
Fort Worth, US
2
Santa Barbara, US
2
Museo Nacional de Costa Rica (MNCR)location not on record
2
University of Wisconsinlocation not on record
2
North Carolina Museum of Natural Scienceslocation not on record
1
Wellington, NZ
1
WTUlocation not on record
1
Clarksville, US
1
Cambridge, US
1
University of Western Ontariolocation not on record
1
US
1
Tempe, US
1
Minia, EG
1
Pullman, US
1
Clemson, US
1
West Virginia Wesleyan Collegelocation not on record
1
State University of New York, College at Oneontalocation not on record
1
Jurica-Suchy Nature Museumlocation not on record
1
San Jose State University, Museum of Birds and Mammalslocation not on record
1
Istituto Agrario Castelnuovolocation not on record
1
LINUlocation not on record
1
Northridge, US
1
MeiseBGlocation not on record
1
Whitehorse, CA
1
Victoria, CA
1
Oswego, US
1
Research Collection of B. A. Bennettlocation not on record
1
Kew, GB
1
Chadron, US
1
GB
1
107 institutions · 2 286 of 2 400 vouchered records shown · 114 without an institution code
09Environmental DNA9 detections
Where the DNA of Carex swanii 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 found9
Studies independent surveys1
Countries2
Signal confidence: weakweighed across independent studies, places & mapped detections
Where its DNA was found
0 of 9 detections have coordinates
Open the map2 countries0
open grassy area; woodland opening with Lotu…
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 median19.4 °C 18.2–23.7
Seasonal swing summer↔winter26.7 °C
Max temp (day)24.2 °C 22.9–28.2
Min temp (night)15.4 °C 13.7–19.6
Precipitation114 mm/mo 83.8–130
Air humidity58.4 % 57.3–60.2
Moisture balance-39.6 mm/mo -77.5–-14.0
Vapour deficit952 Pa 861–1,185
Wind speed3.20 m/s 2.30–4.30
Cloud cover41.1 % 33.0–45.0
CHELSA 1981–2010, ~9 km grid, at location & month of 6 detection points · 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 Foundation4 languages↗
BioWikiNetmultilingual Wikipediamultilingual↗
GBIFGlobal Biodiversity Information Facility3 710 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI9 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics10 specimens↗
NCBIUS National Library of Medicinesequences↗
GRIN TaxonomyUSDA-ARSdistribution & uses↗
Open Tree of LifeOpenTreephylogeny backbone↗
GLoBIGlobal Biotic Interactionsbiotic interactions↗