Piptochaetium avenaceum, commonly called black oat grass, blackseed needle grass or blackseed speargrass, is a species of perennial bunchgrass native to eastern North America. It is a member of the grass family Poaceae.
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 Piptochaetium avenaceum has left across the world's sequence archives.
At a glance
DNA specimens4
Marker genes4
GenBank sequences10
eDNA detections4
Countries1
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.
★matK5★rbcL4★ITS1★ITS2
plant barcodefungal barcode
06Genome at a glanceCCDB
The complete instruction manualPiptochaetium avenaceum 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.
Chromosomes2n = 22 n = 11
Ploidydiploid inferred
Chromosome-count records — grouped by value · 2n = full set, n = gamete · click a value for sources & references
n 111×CCDB · Cave1958
CCDB · Cave1958 — Gould 1958
Ploidy records — measured levels and diploid/polyploid inferences · click for sources
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 origin14.3 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 238 records
Wild obs. + sensor593
Museum / vouchered645
Origin
Native1
Range
Area of Occupancy AOO3 792 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 accuracy82% within 1 km
≤100 m 363≤1 km 39≤10 km 13>10 km 74
489 georeferenced · 104 without coordinates
Open the mapobservation + sensor593
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 accuracy38% within 1 km
≤100 m 36≤1 km 77≤10 km 151>10 km 34
298 georeferenced · 347 without coordinates
Open the institutions mapphysical evidence645
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 institutions47 of 70 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
Institution
Specimens
Chapel Hill, US
65
Bronx, US
41
Jena Microbial Resource Collectionlocation not on record
31
University of Stellenboschlocation not on record
30
New Haven, US
30
Tampa, US
27
Jackson, US
24
James F. Matthews Center for Biodiversity Studieslocation not on record
23
Columbia, US
21
Tuscaloosa, US
18
GAlocation not on record
18
Saint Louis, US
17
Ann Arbor, US
16
Bloomington, US
14
Valdosta State Universitylocation not on record
12
Clemson, US
12
Logan, US
12
Florida Museum of Natural History- Zoology, Paleontology & Paleobotanylocation not on record
12
Austin, US
12
Chongqing Museumlocation not on record
11
Fort Worth, US
10
Burlington, US
9
Norfolk, US
7
BAYLUlocation not on record
7
Mount Berry, US
7
Wuzhou, CN
6
EL PASO, US
6
Tall Timbers Research Stationlocation not on record
6
US
6
Williamsburg, US
6
Riverside, US
5
University of Tennessee at Chattanoogalocation not on record
5
Mississippi State, US
4
Fayetteville, US
4
Dekalb, US
4
AUAlocation not on record
4
Asheville, US
3
Durham, US
3
University of New Hampshirelocation not on record
3
College Park, US
3
University of Southern Mississippilocation not on record
3
Bangkok, TH
3
Auckland, NZ
3
Conway, US
2
San Angelo, US
2
Maryland Department of Natural Resourceslocation not on record
2
Lubbock, US
2
Weymouth Woods Sandhills Nature Preservelocation not on record
2
DOI/NPS, Little Rock Central High School National Historic Sitelocation not on record
2
Little Rock, US
2
Elikins, US
1
Miami, US
1
Lord Fairfax Community Collegelocation not on record
1
Moscow, US
1
Claremont, US
1
Museum of the Rockieslocation not on record
1
North Carolina Museum of Natural Scienceslocation not on record
1
GB
1
Dover, US
1
St. Paul, US
1
McWane Science Centerlocation not on record
1
China Agricultural Universitylocation not on record
1
Fairfax, US
1
ASUlocation not on record
1
Madison, US
1
Knoxville, US
1
Millersville, US
1
Moscow State Universitylocation not on record
1
New Brunswick, US
1
Durango, MX
1
70 institutions · 597 of 645 vouchered records shown · 45 without an institution code
09Environmental DNA4 detections
Where the DNA of Piptochaetium avenaceum 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
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 median12.5 °C 12.5–12.5
Seasonal swing summer↔winter27.0 °C
Max temp (day)18.4 °C
Min temp (night)8.20 °C
Precipitation79.6 mm/mo
Air humidity57.3 %
Moisture balance-38.4 mm/mo
Vapour deficit733 Pa
Wind speed5.80 m/s
Cloud cover36.7 %
CHELSA 1981–2010, ~9 km grid, at location & month of 3 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 Foundation3 languages↗
BioWikiNetmultilingual Wikipediamultilingual↗
GBIFGlobal Biodiversity Information Facility1 238 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI4 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics4 specimens↗
NCBIUS National Library of Medicinesequences↗
GRIN TaxonomyUSDA-ARSdistribution & uses↗
Open Tree of LifeOpenTreephylogeny backbone↗
CCDBChromosome Counts DB · Tel Aviv U.genome & karyotype↗
PloiDBPloidy Databasegenome & karyotype