Gamochaeta argyrinea, the silvery cudweed or silvery everlasting, is a North American species of flowering plant in the family Asteraceae. It is widespread across the southeastern and south-central United States from Delaware south to Florida and west as far as southeastern Kansas and central Texas. It has also been found in Puerto Rico and in northern California (probably introduced).Guy L. Nesom 2004. New distribution records for Gamochaeta (Asteraceae: Gnaphalieae) in the United States. Sida 21(2): 1175–1185.Biota of North America Program 2014 county distribution mapCalflora taxon report, University of California, Gamochaeta argyrinea G.L. Nesom Gamochaeta argyrinea is an annual herb up to 40 cm tall. Leaves are up to 8 cm long, green on the top but appearing silvery on the underside because of many woolly hairs. The plant forms many small flower heads in elongated arrays. Each head contains 4–6 purple or yellow-brown disc flowers but no ray flowers.Flora of North America, Gamochaeta argyrinea G. L. Nesom, 2004. Silvery cudweedNesom, Guy L. 2004. Sida 21(2): 717–741 in English with summary in Spanish; Latin diagnosis on page 721, photos of herbarium specimens on pages 719–720, color photos of flower heads and line drawings of phyllaries on page 723, county-level distribution map on page 731
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 Gamochaeta argyrinea has left across the world's sequence archives.
At a glance
DNA specimens2
Marker genes2
GenBank sequences6
eDNA detections2
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.
★ITS6★ITS2
fungal barcode
07Deep time~0.63 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 origin0.63 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 type287 records
Wild obs. + sensor26
Museum / vouchered261
Range
Area of Occupancy AOO872 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 accuracy85% within 1 km
≤100 m 16≤1 km 1≤10 km 1>10 km 2
20 georeferenced · 6 without coordinates
Open the mapobservation + sensor26
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 accuracy58% within 1 km
≤100 m 12≤1 km 34≤10 km 30>10 km 3
79 georeferenced · 182 without coordinates
Open the institutions mapphysical evidence261
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 institutions36 of 52 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
Institution
Specimens
Valdosta State Universitylocation not on record
21
Bronx, US
16
Austin, US
16
US
15
Fort Worth, US
15
DOI/NPS, Little Rock Central High School National Historic Sitelocation not on record
13
Jena Microbial Resource Collectionlocation not on record
13
GAlocation not on record
11
Saint Louis, US
11
Knoxville, US
10
Chapel Hill, US
9
Jackson, US
8
Columbia, US
7
Tuscaloosa, US
7
Fayetteville, US
6
Fairfax, US
6
Wuzhou, CN
6
Tampa, US
6
AUAlocation not on record
5
University of Tennessee at Chattanoogalocation not on record
5
BIO-UNIPIlocation not on record
4
DOI/NPS, Mississippi National River & Recreation Arealocation not on record
3
Bangkok, TH
3
Pittsburg, US
3
Weymouth Woods Sandhills Nature Preservelocation not on record
2
Kew, GB
2
Claremont, US
2
Tulane Universitylocation not on record
2
Blacksburg, US
2
University of Southern Mississippilocation not on record
2
Williamsburg, US
2
Riverside, US
1
EL PASO, US
1
Chicago, US
1
Mexico City, MX
1
Dover, US
1
New Brunswick, US
1
Auckland, NZ
1
BISHlocation not on record
1
Laboratory of Palaeontologylocation not on record
1
Clemson, US
1
Tennessee Technological Universitylocation not on record
1
Lincoln, US
1
Russellville, US
1
Norfolk, US
1
Calabar, NG
1
MEXUlocation not on record
1
Cambridge, US
1
Davis, US
1
LDlocation not on record
1
Boise, US
1
Johnson City, US
1
52 institutions · 254 of 261 vouchered records shown · 7 without an institution code
09Environmental DNA2 detections
Where the DNA of Gamochaeta argyrinea 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 found2
Studies independent surveys1
Signal confidence: weakweighed across independent studies, places & mapped detections
Where its DNA was found
0 of 2 detections have coordinates
Open the map0 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.
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 Facility287 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI2 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics2 specimens↗
NCBIUS National Library of Medicinesequences↗
Open Tree of LifeOpenTreephylogeny backbone↗