Eleocharis equisetoides, with common names including horsetail spike-rush, jointed spike-rush, spikesedge, and knotted spike-rush, is a plant species native to the United States and Ontario, usually in freshwater wetland areas. It is known primarily from the Atlantic coastal plain from Texas to Massachusetts, and the Great Lakes region, with scattered populations elsewhere.Flora of North America v 23 p 120Biota of North America Program 2013 county distribution mapKew World Checklist of Selected Plant Families Eleocharis equisetoides and the related E. interstincta have hollow stems with complete transverse septa. This gives them a jointed appearance superficially resembling the stems of some species of Equisetum. The two species can be distinguished by the length of the perianth bristles subtending the achenes.Torrey, John. Annals of the Lyceum of Natural History of New York 3: 296. 1836.Elliott, Stephen. Sketch of the Botany of South-Carolina and Georgia 1(1): 79. 1816.
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 Eleocharis equisetoides has left across the world's sequence archives.
At a glance
DNA specimens5
Marker genes5
GenBank sequences9
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.
★matK2★rbcL4★rbcLa★ITS3★ITS2
plant barcodefungal barcode
08Occurrence & distribution
Record type398 records
Wild obs. + sensor71
Museum / vouchered327
Range
Area of Occupancy AOO1 108 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 accuracy59% within 1 km
≤100 m 28≤1 km 6≤10 km 2>10 km 22
58 georeferenced · 13 without coordinates
Open the mapobservation + sensor71
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 accuracy46% within 1 km
≤100 m 15≤1 km 49≤10 km 57>10 km 17
138 georeferenced · 189 without coordinates
Open the institutions mapphysical evidence327
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 institutions34 of 59 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
Institution
Specimens
Jena Microbial Resource Collectionlocation not on record
40
Chapel Hill, US
39
Jackson, US
30
Ann Arbor, US
18
Tampa, US
18
Bronx, US
13
Valdosta State Universitylocation not on record
10
Bangkok, TH
9
US
9
Austin, US
7
BAYLUlocation not on record
7
New Haven, US
6
GAlocation not on record
6
Tuscaloosa, US
6
Columbia, US
5
Knoxville, US
5
Miami, US
5
Wuzhou, CN
5
Mississippi State, US
5
Tall Timbers Research Stationlocation not on record
5
Bloomington, US
4
University of Stellenboschlocation not on record
4
James F. Matthews Center for Biodiversity Studieslocation not on record
4
Chongqing Museumlocation not on record
4
DOI/NPS, Mississippi National River & Recreation Arealocation not on record
4
ASUlocation not on record
4
Williamsburg, US
3
Masindi, UG
3
University of South Carolina Salkehatchielocation not on record
3
Porto Alegre, BR
3
UNITINSlocation not on record
2
Chicago, US
2
University of Southern Mississippilocation not on record
2
Burlington, US
2
Museu Nacional, Universidade Federal do Rio de Janeirolocation not on record
2
Universidade Federal do Ceara, Departamento de Biologialocation not on record
2
Saint Louis, US
2
Universidade Federal de Sergipe (UFS)location not on record
2
San Angelo, US
2
Fortaleza, BR
2
McWane Science Centerlocation not on record
2
Madison, US
2
EL PASO, US
1
Clemson, US
1
Little Rock, US
1
San Jose State University, Museum of Birds and Mammalslocation not on record
1
Auckland, NZ
1
Florida Museum of Natural History- Zoology, Paleontology & Paleobotanylocation not on record
1
BClocation not on record
1
CEPLAClocation not on record
1
Université de Bordeauxlocation not on record
1
University of Tennessee at Chattanoogalocation not on record
1
Guasave, MX
1
Norfolk, US
1
China Agricultural Universitylocation not on record
1
Paris, FR
1
Flagstaff, US
1
Edmonton, CA
1
Universidade Federale do Rio Grande do Sullocation not on record
1
59 institutions · 325 of 327 vouchered records shown · 2 without an institution code
09Environmental DNA4 detections
Where the DNA of Eleocharis equisetoides 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
Signal confidence: weakweighed across independent studies, places & mapped detections
Where its DNA was found
0 of 4 detections have coordinates
Open the map0 countries0
At the end of a narrow marsh between two rid…
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.
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 Facility398 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI4 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics5 specimens↗
NCBIUS National Library of Medicinesequences↗
GRIN TaxonomyUSDA-ARSdistribution & uses↗
Open Tree of LifeOpenTreephylogeny backbone↗
GLoBIGlobal Biotic Interactionsbiotic interactions↗