Houstonia caerulea
speciesAt a glance
Sources10 archives
Databases and archives Houstonia caerulea's data was compiled from.
WikipediaWikimedia Foundation4 languages↗
BioWikiNetmultilingual Wikipediamultilingual↗
GBIFGlobal Biodiversity Information Facility27 084 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI6 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics8 specimens↗
GRIN TaxonomyUSDA-ARSdistribution & uses↗
CCDBChromosome Counts DB · Tel Aviv U.genome & karyotype↗
PloiDBPloidy Databasegenome & karyotype
Paleobiology DatabasePBDB consortiumfossil record↗
GLoBIGlobal Biotic Interactionsbiotic interactions↗Every layer below draws on the sources above — open one to explore it, or use ← → to move between tabs.
Houstonia caerulea, commonly known as azure bluet, Quaker ladies, or bluets, is a perennial species in the family Rubiaceae. It is native to eastern Canada (Ontario to Newfoundland) and the eastern United States (Maine to Wisconsin, south to Florida and Louisiana, with scattered populations in Oklahoma).Biota of North America Program It is found in a variety of habitats such as cliffs, alpine zones, forests, meadows and shores of rivers or lakes.
No narrative description available for this taxon yet.
Life cycle & reproduction3
Diet & foraging1
Habitat & environment6
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 Houstonia caerulea has left across the world's sequence archives.
At a glance
★ 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.
The complete instruction manual Houstonia caerulea 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.
2n 326×CCDB · book-ipcn65 · CCDB · ipcn-api-dl · CCDB · book-ipcn66 +1
2n 162×CCDB · ipcn-api-dl · CCDB · Cave1962
2n 362×CCDB · book-fedorov · CCDB · book-atlas-flowering-plants
n 164×CCDB · book-ipcn65 · CCDB · ipcn-api-dl · CCDB · book-ipcn75-78 +1
n 81×CCDB · Cave1962
diploid inferred1×PloiDB · genus-scale
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
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.
Record type27 084 records
Origin
Range
Wildobservation + sensor
Human sightings and records, or camera-trap / sensor detections — someone (or a device) saw or captured the species in the wild.
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.
Cultivated / Captivenot free-living
A living individual in a botanical garden, zoo or nursery — cultivated or kept, not free-living.
Wildobservation + sensor
Human sightings and records, or camera-trap / sensor detections — someone (or a device) saw or captured the species in the wild.
Holding institutions78 of 117 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
| Institution | Specimens |
|---|---|
| Chongqing Museumlocation not on record | 400 |
| Philadelphia, US | 358 |
| Chapel Hill, US | 187 |
| Durham, US | 106 |
| College Park, US | 96 |
| Burlington, US | 82 |
| Williamsburg, US | 64 |
| Bloomington, US | 62 |
| University of Stellenboschlocation not on record | 61 |
| Acadia Universitylocation not on record | 59 |
| New Haven, US | 53 |
| Québec, CA | 37 |
| Tuscaloosa, US | 34 |
| Jena Microbial Resource Collectionlocation not on record | 32 |
| Millersville, US | 31 |
| Norfolk, US | 31 |
| Wuzhou, CN | 26 |
| Knoxville, US | 25 |
| Mount Berry, US | 21 |
| Montréal, CA | 20 |
| Bangkok, TH | 19 |
| Madison, US | 17 |
| Keene State Universitylocation not on record | 16 |
| GAlocation not on record | 15 |
| Staten Island, US | 13 |
| Saint Louis, US | 10 |
| Morgantown, US | 10 |
| Emporia, US | 10 |
| Flagstaff, US | 9 |
| Richmond, US | 9 |
| AUAlocation not on record | 8 |
| Washington, US | 8 |
| DOI/NPS, Greenbelt Parklocation not on record | 7 |
| Kingston, US | 7 |
| Lord Fairfax Community Collegelocation not on record | 7 |
| Chicago, US | 7 |
| Tennessee Technological Universitylocation not on record | 7 |
| Dekalb, US | 6 |
| Davenport, US | 6 |
| James F. Matthews Center for Biodiversity Studieslocation not on record | 6 |
| Clemson, US | 6 |
| Université Lavallocation not on record | 6 |
| Philadelphia, US | 5 |
| Jackson, US | 5 |
| US | 5 |
| New Brunswick, US | 5 |
| Ann Arbor, US | 5 |
| Dover, US | 5 |
| University of Tennessee at Chattanoogalocation not on record | 5 |
| Saint John, CA | 4 |
| Paris, FR | 4 |
| Western Carolina Universitylocation not on record | 4 |
| Canadian Department of Agriculturelocation not on record | 4 |
| Little Rock, US | 4 |
| Columbia, US | 4 |
| Fairfax, US | 4 |
| BAYLUlocation not on record | 4 |
| Bronx, US | 4 |
| Asheville, US | 3 |
| MeiseBGlocation not on record | 3 |
| Long Beach, US | 3 |
| West Virginia Wesleyan Collegelocation not on record | 3 |
| Florida Museum of Natural History- Zoology, Paleontology & Paleobotanylocation not on record | 3 |
| Miami, US | 3 |
| Northridge, US | 3 |
| ASUlocation not on record | 3 |
| Conway, US | 3 |
| Fredericksburg, US | 3 |
| China Agricultural Universitylocation not on record | 2 |
| Fayetteville, US | 2 |
| Mohonk Preservelocation not on record | 2 |
| KURAlocation not on record | 2 |
| DOI/NPS, Little Rock Central High School National Historic Sitelocation not on record | 2 |
| San Angelo, US | 2 |
| Sagamihara, JP | 2 |
| University of Guelph, OAC Herbariumlocation not on record | 2 |
| Santa Barbara, US | 2 |
| Boise, US | 2 |
| Dresden, DE | 2 |
| GB | 2 |
| Denver, US | 2 |
| Mississippi State, US | 2 |
| Durham, US | 1 |
| North Carolina Museum of Natural Scienceslocation not on record | 1 |
| Tsukuba, JP | 1 |
| Adam Mickiewicz University in Poznańlocation not on record | 1 |
| Pullman, US | 1 |
| Nagano City, JP | 1 |
| Trois-Rivières, CA | 1 |
| Institut und Museum fuer Geologie und Palaeontologielocation not on record | 1 |
| Chicago, US | 1 |
| Sanda, JP | 1 |
| St. Paul, US | 1 |
| DULlocation not on record | 1 |
| SLU Artdatabankenlocation not on record | 1 |
| Museum of the Rockieslocation not on record | 1 |
| EL PASO, US | 1 |
| Universität Göttingenlocation not on record | 1 |
| Chicago, US | 1 |
| Davis, US | 1 |
| US | 1 |
| Toyama, JP | 1 |
| University of South Carolina Salkehatchielocation not on record | 1 |
| Oskarshamn, SE | 1 |
| University of Southern Mississippilocation not on record | 1 |
| Tempe, US | 1 |
| Weymouth Woods Sandhills Nature Preservelocation not on record | 1 |
| Audubon Society -- Silver Bluff Audubon Center and Sanctuarylocation not on record | 1 |
| Conway, US | 1 |
| Institut de Biologia Evolutiva, (CSIC-UPF)location not on record | 1 |
| UMKClocation not on record | 1 |
| Riverside, US | 1 |
| Springfield, US | 1 |
| Guilin, CN | 1 |
| Beijing, CN | 1 |
| Oswego, US | 1 |
| LDlocation not on record | 1 |
Cultivated / Captivenot free-living
A living individual in a botanical garden, zoo or nursery — cultivated or kept, not free-living.
Where the DNA of Houstonia caerulea 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
Where its DNA was found
How strong is each trace?
Modelled climatemodelled
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.