Crassula aquatica is a succulent plant known by the common names water pygmyweed, common pygmyweed and just pigmyweed. It is an annual plant of salt marshes, vernal pools, wetlands, and other fresh to brackish water bodies. It is at least partially aquatic, living in areas which are submersed much of the time. It also lives along muddy banks and in tidally-active areas of estuaries.
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 Crassula aquatica has left across the world's sequence archives.
At a glance
DNA specimens30
Marker genes5
GenBank sequences10
eDNA detections16
Countries6
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.
★matK★rbcL3★rbcLa★ITS7★ITS2
plant barcodefungal barcode
06Genome at a glanceCCDB
The complete instruction manualCrassula aquatica 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.
Genome sizehow big the whole instruction manual is
Genome size332 520 000 bp
Measured in base pairs (bp) — the individual letters of DNA (human ≈ 3.2 Gb, a bacterium a few million). The chart places this genome on a logarithmic scale — each step to the right is ten times bigger — among reference organisms. Across species a bigger genome loosely tracks with larger cells, slower growth and lower-energy lifestyles (powered flight favours small genomes) — yet it does not imply more genes or a more advanced organism (the long-standing C-value paradox).
BACTERIUM Carsonella ruddii0.00016 Gb
FUNGUS0.04 Gb
INSECT0.25 Gb
THIS GENOME Crassula aquatica0.33 Gb
HUMAN3.2 Gb
WHEAT17 Gb
FERN Tmesipteris160.45 Gb
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 accuracy94% within 1 km
≤100 m 3 144≤1 km 668≤10 km 231>10 km 26
4 069 georeferenced · 159 without coordinates
Open the mapobservation + sensor4 228
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 accuracy45% within 1 km
≤100 m 271≤1 km 319≤10 km 318>10 km 395
1 303 georeferenced · 788 without coordinates
Open the institutions mapphysical evidence2 091
Cultivated / Captivenot free-living
A living individual in a botanical garden, zoo or nursery — cultivated or kept, not free-living.
Coordinate accuracy0% within 1 km
>10 km 1
1 georeferenced
Open the mapnot free-living1
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 institutions77 of 120 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
Institution
Specimens
Helsinki, FI
341
Olocation not on record
227
LDlocation not on record
147
Oulu, FI
96
Trondheim, NO
59
Clocation not on record
55
DOI/NPS, Little Rock Central High School National Historic Sitelocation not on record
50
Victoria, CA
47
Uppsala, SE
44
San Diego, US
38
Bergen, NO
36
Turku, FI
36
SLU Artdatabankenlocation not on record
34
WTUlocation not on record
33
Claremont, US
32
Riverside, US
31
Vancouver, CA
31
Santa Barbara, US
30
Davis, US
30
Philadelphia, US
29
Metsähallituslocation not on record
28
Chicago, US
24
San Luis Obispo, US
24
Oskarshamn, SE
23
Corvallis, US
23
CASlocation not on record
19
Austin, US
18
Kuopio, FI
18
US
17
TUR-Alocation not on record
17
Pullman, US
15
Québec, CA
15
KMNlocation not on record
13
National Biodiversity Institute, Costa Ricalocation not on record
13
Montréal, CA
11
Saint John, CA
10
Burlington, US
10
Saint Louis, US
10
Juriquilla, MX
9
Canadian Department of Agriculturelocation not on record
8
Little Rock, US
8
Tartu, EE
8
Severin-McDaniel Insect Collectionlocation not on record
7
Museo civico La Terra e l'Uomo di Crocetta del Montellolocation not on record
7
BAYLUlocation not on record
7
University of Stellenboschlocation not on record
6
Fort Worth, US
6
Wuzhou, CN
6
Bronx, US
6
TROMlocation not on record
6
Santa Cruz, US
6
Angwin, US
6
nbflocation not on record
6
Jyväskylä, FI
5
Moscow State Universitylocation not on record
5
Xiamen, CN
5
Ann Arbor, US
5
Whitehorse, CA
5
Missoula, US
5
Moscow, US
5
Durham, US
5
Mexico City, MX
5
Irkutsk State Universitylocation not on record
5
Portland, US
5
Boise, US
4
Porvoo, FI
4
GMBAlocation not on record
4
Acadia Universitylocation not on record
4
GBS RAN - Glavny Botanichesky Sad Rossijskoj Akademii Nauklocation not on record
4
Philadelphia, US
4
Flagstaff, US
4
Kew, GB
3
Finnish Museum of Natural Historylocation not on record
3
US
3
Chongqing Museumlocation not on record
3
San José, CR
3
Museo Nacional de Costa Rica (MNCR)location not on record
3
Université Lavallocation not on record
3
Kyoto Universitylocation not on record
3
Research Collection of B. A. Bennettlocation not on record
3
Göteborg, SE
3
ASUlocation not on record
3
University of New Hampshirelocation not on record
2
Caldwell, US
2
New Haven, US
2
Forssa, FI
2
South Kensington, GB
2
Tampa, US
2
Tuscaloosa, US
2
Irvine, US
2
NTNU University Museum, Department of Natural Historylocation not on record
2
Loja, EC
2
Royal Botanic Garden Edinburghlocation not on record
2
Arcata, US
2
Chapel Hill, US
2
Durango, MX
1
Universität Göttingenlocation not on record
1
San Diego Natural History Museumlocation not on record
1
Denver, US
1
Nanjing, CN
1
Royal Ontario Museum, Green Plant Herbarium (TRT)location not on record
1
Cuenca, EC
1
University of British Columbia, Herbariumlocation not on record
1
Puerto Ayora, EC
1
Tromso University Museumlocation not on record
1
Coimbra, PT
1
Rovaniemi, FI
1
Guasave, MX
1
Ensenada, MX
1
University of Patraslocation not on record
1
Centro de Investigación en Biodiversidad y Conservación, Universidad Autónoma del Estado de Moreloslocation not on record
1
Provincia di Livornolocation not on record
1
San Jose State University, Museum of Birds and Mammalslocation not on record
1
Cambridge, US
1
Cambridge, US
1
Sucre, BO
1
Fort Bragg, US
1
Long Beach, US
1
Henderson, US
1
Catalina Island Conservancylocation not on record
1
120 institutions · 2 003 of 2 091 vouchered records shown · 87 without an institution code
Cultivated / Captivenot free-living
A living individual in a botanical garden, zoo or nursery — cultivated or kept, not free-living.
09Environmental DNA16 detections
Where the DNA of Crassula aquatica 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 found16
Studies independent surveys1
Countries6
Signal confidence: weakweighed across independent studies, places & mapped detections
Where its DNA was found
0 of 16 detections have coordinates
Open the map6 countries0
Damp sandy margin of pond among hills.Vernal Pool vegetation with Lolium multiflor…Rare Plants Nursery, Cultivated from wild so…
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 median11.8 °C 6.50–15.2
Seasonal swing summer↔winter18.7 °C
Max temp (day)13.5 °C 9.90–16.6
Min temp (night)7.90 °C 1.60–12.0
Precipitation88.2 mm/mo 50.5–237
Air humidity64.0 % 61.6–67.9
Moisture balance24.5 mm/mo -80.1–159
Vapour deficit445 Pa 381–646
Wind speed5.00 m/s 2.10–5.70
Cloud cover48.9 % 40.3–52.6
CHELSA 1981–2010, ~9 km grid, at location & month of 13 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 Foundation4 languages↗
BioWikiNetmultilingual Wikipediamultilingual↗
GBIFGlobal Biodiversity Information Facility6 316 records↗
OBISOcean Biodiversity Information System10 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI16 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics30 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
GLoBIGlobal Biotic Interactionsbiotic interactions↗