Hieracium venosum (Robin's plantain, rattlesnakeweed, or rattlesnake hawkweed) is a species of hawkweed in the tribe Cichorieae within the family Asteraceae. It is widespread and common in south-central Canada (Ontario) and the eastern United States (from Michigan east to Maine and south as far as Florida and Mississippi).Biota of North America Program 2014 county distribution map Its common name comes from the fact that environments it is found in are typically also a home to rattlesnakes. Hieracium venosum is a hairy herb up to 45 cm (18 inches) tall, with most of the leaves crowded around the base of the stem. One plant can produce as many as 20 flower heads, each with 30–45 yellow ray flowers but no disc flowers.Flora of North America, Hieracium venosum Linnaeus, 1753. It is a perennial that blooms from May to September, and prefers shady conditions with dry, sandy soil.
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 Hieracium venosum has left across the world's sequence archives.
At a glance
DNA specimens19
Marker genes5
eDNA detections9
Countries2
Marker genes sequenced
★ 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★rbcL★rbcLa★ITS2trnH-psbA
plant barcodefungal barcodemarker
06Genome at a glanceCCDB
The complete instruction manualHieracium venosum 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.
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 4 096≤1 km 827≤10 km 398>10 km 462
5 783 georeferenced · 1 292 without coordinates
Open the mapobservation + sensor7 075
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 accuracy35% within 1 km
≤100 m 35≤1 km 277≤10 km 498>10 km 86
896 georeferenced · 332 without coordinates
Open the institutions mapphysical evidence1 228
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 institutions60 of 84 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
395
Bronx, US
80
Chongqing Museumlocation not on record
62
Williamsburg, US
61
University of Stellenboschlocation not on record
56
Bangkok, TH
55
Burlington, US
43
College Park, US
43
Allentown, US
27
Knoxville, US
21
Chapel Hill, US
21
Ann Arbor, US
20
Bloomington, US
18
New Haven, US
18
University of New Hampshirelocation not on record
16
Staten Island, US
13
Norfolk, US
13
Mount Berry, US
12
Morgantown, US
12
Western Carolina Universitylocation not on record
11
Clemson, US
11
GAlocation not on record
11
Lord Fairfax Community Collegelocation not on record
10
Harrisonburg, US
9
Millersville, US
9
Tuscaloosa, US
8
Johnson City, US
8
Columbia, US
8
Asheville, US
8
Davenport, US
5
McWane Science Centerlocation not on record
5
Flagstaff, US
4
Fairfax, US
4
University of Tennessee at Chattanoogalocation not on record
4
Dover, US
4
Philadelphia, US
4
Denver, US
3
Kingston, US
3
Dekalb, US
3
AUAlocation not on record
3
Mississippi State, US
3
Beijing, CN
2
US
2
Wuzhou, CN
2
Boise, US
2
Northridge, US
2
DOI/NPS, Greenbelt Parklocation not on record
2
Washington, US
2
Richmond, US
2
University of Guelph, OAC Herbariumlocation not on record
2
DOI/NPS, Mississippi National River & Recreation Arealocation not on record
2
Vancouver, CA
2
Keene State Universitylocation not on record
2
Mohonk Preservelocation not on record
2
Miami, US
2
Smithsonian Institutionlocation not on record
2
New Brunswick, US
2
Fredericksburg, US
2
James F. Matthews Center for Biodiversity Studieslocation not on record
2
EL PASO, US
2
Baltimore, US
1
Moscow, US
1
Saint Louis, US
1
Long Beach, US
1
University of Southern Mississippilocation not on record
1
Chicago, US
1
Montréal, CA
1
Durham, US
1
USP-IBlocation not on record
1
Blacksburg, US
1
Hudson, US
1
Florida Museum of Natural History- Zoology, Paleontology & Paleobotanylocation not on record
1
Davis, US
1
Paris, FR
1
San Angelo, US
1
Black Rock Forest Consortiumlocation not on record
1
Provo, US
1
Jackson, US
1
Henderson State Universitylocation not on record
1
Guilin, CN
1
Weymouth Woods Sandhills Nature Preservelocation not on record
1
Maryland Department of Natural Resourceslocation not on record
1
BClocation not on record
1
Fort Worth, US
1
84 institutions · 1 186 of 1 228 vouchered records shown · 42 without an institution code
09Environmental DNA9 detections
Where the DNA of Hieracium venosum 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
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 median11.7 °C 7.90–17.6
Seasonal swing summer↔winter26.0 °C
Max temp (day)16.9 °C 12.3–21.0
Min temp (night)6.80 °C 3.70–15.4
Precipitation91.1 mm/mo 75.5–99.9
Air humidity56.3 % 55.7–60.0
Moisture balance-13.1 mm/mo -25.6–5.40
Vapour deficit683 Pa 510–811
Wind speed3.90 m/s 3.10–5.70
Cloud cover44.4 % 43.9–47.7
CHELSA 1981–2010, ~9 km grid, at location & month of 5 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 Facility8 303 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI9 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics19 specimens↗
GRIN TaxonomyUSDA-ARSdistribution & uses↗
CCDBChromosome Counts DB · Tel Aviv U.genome & karyotype↗
PloiDBPloidy Databasegenome & karyotype
Paleobiology DatabasePBDB consortiumfossil record↗
GLoBIGlobal Biotic Interactionsbiotic interactions↗