Aristida purpurascens is a species of grass known by the common name arrowfeather threeawn. It is native to eastern North America. One of the three varieties has a distribution extending south into Honduras.Aristida purpurascens. Grass Manual Treatment.
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 Aristida purpurascens has left across the world's sequence archives.
At a glance
DNA specimens9
Marker genes3
GenBank sequences10
eDNA detections7
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.
★matK4★rbcL6★rbcLa
plant barcode
07Deep time~0.72 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 origin0.72 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 type1 265 records
Wild obs. + sensor309
Museum / vouchered956
Origin
Native2
Range
Area of Occupancy AOO3 928 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 accuracy77% within 1 km
≤100 m 197≤1 km 5≤10 km 2>10 km 59
263 georeferenced · 46 without coordinates
Open the mapobservation + sensor309
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 accuracy40% within 1 km
≤100 m 52≤1 km 121≤10 km 208>10 km 48
429 georeferenced · 527 without coordinates
Open the institutions mapphysical evidence956
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 institutions62 of 99 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
Institution
Specimens
Bronx, US
91
Philadelphia, US
66
Wuzhou, CN
59
Jackson, US
55
Jena Microbial Resource Collectionlocation not on record
51
Bangkok, TH
39
Austin, US
32
Fort Worth, US
29
Ann Arbor, US
26
University of Southern Mississippilocation not on record
24
Clemson, US
23
Columbia, US
22
University of Stellenboschlocation not on record
20
Saint Louis, US
19
Williamsburg, US
18
US
18
AUAlocation not on record
17
New Haven, US
17
College Park, US
15
Valdosta State Universitylocation not on record
15
Bloomington, US
14
Tampa, US
13
GAlocation not on record
13
Florida Museum of Natural History- Zoology, Paleontology & Paleobotanylocation not on record
13
Chapel Hill, US
12
BAYLUlocation not on record
9
Maryland Department of Natural Resourceslocation not on record
9
Chongqing Museumlocation not on record
8
Tuscaloosa, US
8
Lincoln, US
7
Knoxville, US
7
San Angelo, US
7
Chadron, US
7
EL PASO, US
6
Dekalb, US
6
James F. Matthews Center for Biodiversity Studieslocation not on record
6
Auckland, NZ
5
Logan, US
5
Museum of the Rockieslocation not on record
5
Museo civico La Terra e l'Uomo di Crocetta del Montellolocation not on record
5
Madison, US
5
Chicago, US
5
Staten Island, US
4
Tall Timbers Research Stationlocation not on record
4
Tempe, US
4
DOI/NPS, Mississippi National River & Recreation Arealocation not on record
4
ASUlocation not on record
4
Weymouth Woods Sandhills Nature Preservelocation not on record
4
Flagstaff, US
4
Canadian Department of Agriculturelocation not on record
4
Fairfax, US
3
Wlocation not on record
3
University of South Carolina Salkehatchielocation not on record
3
Edmonton, CA
3
Little Rock, US
3
Provo, US
3
Millersville, US
3
University of Tennessee at Chattanoogalocation not on record
3
Moscow, US
3
Asheville, US
3
Denton, US
3
University of North Carolina at Pembrokelocation not on record
3
St. Paul, US
2
Wellington, NZ
2
Fullerton, US
2
Lubbock, US
2
University of Guelph, OAC Herbariumlocation not on record
2
Chicago, US
2
Denver, US
2
Conway, US
2
North Carolina Museum of Natural Scienceslocation not on record
2
Davenport, US
2
Boise, US
2
Mississippi State, US
2
Taipei, TW
1
Kew, GB
1
DOI/NPS, Colonial National Historical Parklocation not on record
1
Barcelona, ES
1
Museo Entomologico de Leonlocation not on record
1
MeiseBGlocation not on record
1
Institut de Biologia Evolutiva, (CSIC-UPF)location not on record
1
Tulane Universitylocation not on record
1
Whitehorse, CA
1
LINUlocation not on record
1
Chapingo, MX
1
GB
1
Albuquerque, US
1
Long Beach, US
1
Burlington, US
1
Beijing, CN
1
University of New Hampshirelocation not on record
1
Dresden, DE
1
Columbus State Universitylocation not on record
1
Uniwersytet Jagiellońskilocation not on record
1
Florida Museum of Natural Historylocation not on record
1
Audubon Society -- Silver Bluff Audubon Center and Sanctuarylocation not on record
1
Jurica-Suchy Nature Museumlocation not on record
1
Musee des Dinosaures d'Esperaza (Aude)location not on record
1
Dover, US
1
99 institutions · 948 of 956 vouchered records shown · 6 without an institution code
09Environmental DNA7 detections
Where the DNA of Aristida purpurascens 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 found7
Studies independent surveys1
Countries2
Signal confidence: weakweighed across independent studies, places & mapped detections
Where its DNA was found
0 of 7 detections have coordinates
Open the map2 countries0
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 median20.2 °C 14.9–22.9
Seasonal swing summer↔winter26.6 °C
Max temp (day)25.6 °C 20.8–28.1
Min temp (night)16.3 °C 10.6–18.9
Precipitation88.1 mm/mo 79.9–98.3
Air humidity57.2 % 56.3–59.0
Moisture balance-42.3 mm/mo -58.1–-2.40
Vapour deficit1,005 Pa 793–1,171
Wind speed2.90 m/s 2.20–5.70
Cloud cover36.2 % 28.8–38.3
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 Foundation2 languages↗
BioWikiNetmultilingual Wikipediamultilingual↗
GBIFGlobal Biodiversity Information Facility1 265 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI7 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics9 specimens↗
NCBIUS National Library of Medicinesequences↗
GRIN TaxonomyUSDA-ARSdistribution & uses↗
Open Tree of LifeOpenTreephylogeny backbone↗
GLoBIGlobal Biotic Interactionsbiotic interactions↗