Trixis inula, the tropical threefold, is a plant species native to Texas, Mexico, Central America, northern South America, and the West Indies. It is found on open, sandy sites such as roadsides, thorn scrub, thickets, etc.Flora of North America v 19 p 75D'Arcy, W.G. 1987. Flora of Panama. Checklist and Index. Part 1: The introduction and checklist. Monographs in systematic botany from the Missouri Botanical Garden 17: v–xxx, 1–328.Davidse, G., M. Sousa-Peña, S. Knapp & F. Chiang Cabrera. 2014. Asteraceae. 5(2): ined. In G. Davidse, M. Sousa Sánchez, S. Knapp & F. Chiang Cabrera (eds.) Flora Mesoamericana. Universidad Nacional Autónoma de México, México.Nelson, C. H. 2008. Catálogo de las Plantas Vasculares de Honduras 1–1576.Idárraga-Piedrahita, A., R. D. C. Ortiz, R. Callejas Posada & M. Merello. (eds.) 2011. Flora de Antioquia: Catálogo de las Plantas Vasculares 2: 9–939. Universidad de Antioquia, Medellín. Trixis inula is a much-branched shrub up to 300 cm (10 feet) tall. It has lanceolate to elliptic leaves up to 17 cm (7 inches) long. Yellow flower heads are borne in paniculate arrays.Crantz, Heinrich Johann Nepomuk von. Institutiones Rei Herbariae 1: 329. 1766.Anderson, C. E. 1972. A monograph of the Mexican and Central American species of Trixis (Compositae). Memoirs of the New York Botanical Garden 22(3): 1–68.Richardson, A. 1995. Plants of the Rio Grande Delta. University of Texas Press, Austin.
No narrative description available for this taxon yet.
Compounds documented for Trixis inula across natural-product and food-composition databases — not just the ~150 nutrients on a classic label ("nutritional dark matter").
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 Trixis inula has left across the world's sequence archives.
At a glance
DNA specimens11
Marker genes6
GenBank sequences6
eDNA detections5
Countries3
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★rbcL2★rbcLa★ITS2★ITS2trnH-psbA
plant barcodefungal barcodemarker
06Genome at a glanceCCDB
The complete instruction manualTrixis inula 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 accuracy88% within 1 km
≤100 m 199≤1 km 95≤10 km 20>10 km 21
335 georeferenced · 115 without coordinates
Open the mapobservation + sensor450
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 accuracy92% within 1 km
≤100 m 794≤1 km 39≤10 km 58>10 km 13
904 georeferenced · 892 without coordinates
Open the institutions mapphysical evidence1 796
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 institutions42 of 82 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
Institution
Specimens
Durango, MX
374
Mexico City, MX
291
Saint Louis, US
211
Austin, US
124
Tuxtla Gutiérrez, MX
88
National Biodiversity Institute, Costa Ricalocation not on record
76
Museo Nacional de Costa Rica (MNCR)location not on record
54
Bronx, US
53
Mérida, MX
50
Antiguo Cuscatlán, SV
46
Universidad Nacional de Colombia (UNAL)location not on record
32
Juriquilla, MX
28
Berlin, DE
27
University of Stellenboschlocation not on record
23
CASlocation not on record
20
León, NI
19
Kew, GB
19
Tuxtla Gutiérrez, MX
15
Austin, US
14
Tapachula, MX
12
Mérida, MX
11
San José, CR
9
Fundación Desarrollo y Ambiente FUNDAlocation not on record
8
San Francisco de Campeche, MX
8
St. Augustine, TT
7
Cambridge, US
7
Tampa, US
7
Universidad Industrial de Santander (UIS)location not on record
6
Universidad de La Salle (La Salle)location not on record
6
Tlalnepantla, MX
6
Wuzhou, CN
5
Sociedad para el Estudio de los Recursos Bióticos de Oaxaca, A. C.location not on record
5
Ann Arbor, US
5
Mexico City, MX
5
Instituto de Investigación de Recursos Biológicos Alexander von Humboldt (IAvH)location not on record
5
Universidad de Antioquia (UdeA)location not on record
5
Instituto de Investigaciones Biológicas, Universidad Veracruzana, Región Xalapalocation not on record
5
Chicago, US
5
Zapopan, MX
4
Riverside, US
4
Guatemala City, GT
4
Jardín Botánico de Cartagena "Guillermo Piñeres" (JBC)location not on record
4
BMlocation not on record
4
ASUlocation not on record
4
BAYLUlocation not on record
3
Sangmiung Universitylocation not on record
3
Calabar, NG
3
HEMlocation not on record
3
Area de Conservacion Guanacastelocation not on record
3
Montréal, CA
3
Altos de Pipe, VE
2
Fredericksburg, US
2
Universidad Autónoma de Guadalajaralocation not on record
2
San Diego, US
2
Stockholm, SE
2
Ciudad de México, MX
2
EL PASO, US
2
HUAlocation not on record
2
Universidad Nacional Agrarialocation not on record
2
Puebla, MX
1
MeiseBGlocation not on record
1
Centro de Investigación en Biodiversidad y Conservación, Universidad Autónoma del Estado de Moreloslocation not on record
1
Jena Microbial Resource Collectionlocation not on record
1
FLASlocation not on record
1
Universidad de El Salvadorlocation not on record
1
Universidad Autonoma de Yucatanlocation not on record
1
Corporación Autónoma Regional Para la Defensa de la Meseta de Bucaramanga (CDMB)location not on record
1
Canadian Department of Agriculturelocation not on record
1
JBRJlocation not on record
1
OTSlocation not on record
1
XALlocation not on record
1
INBIOlocation not on record
1
University of Zhejianglocation not on record
1
MOBOTlocation not on record
1
Fundación Jardín Botánico Joaquín Antonio Uribe de Medellínlocation not on record
1
Smithsonian Institution, National Museum of Natural Historylocation not on record
1
Flagstaff, US
1
Florida Museum of Natural History- Zoology, Paleontology & Paleobotanylocation not on record
1
MAlocation not on record
1
Fort Worth, US
1
South Kensington, GB
1
Bloomington, US
1
82 institutions · 1 774 of 1 796 vouchered records shown · 22 without an institution code
09Environmental DNA5 detections
Where the DNA of Trixis inula 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 found5
Studies independent surveys1
Countries3
Signal confidence: weakweighed across independent studies, places & mapped detections
Where its DNA was found
0 of 5 detections have coordinates
Open the map3 countries0
selva baja caducifolia secundaria
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 median25.2 °C 22.8–25.2
Seasonal swing summer↔winter2.00 °C
Max temp (day)27.1 °C 27.1–27.9
Min temp (night)23.7 °C 18.3–23.7
Precipitation345 mm/mo 66.2–345
Air humidity71.3 % 55.4–71.3
Moisture balance199 mm/mo -68.3–199
Vapour deficit915 Pa 915–1,243
Wind speed2.60 m/s 2.20–3.30
Cloud cover42.8 % 31.8–42.8
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 Facility2 490 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI5 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics11 specimens↗
NCBIUS National Library of Medicinesequences↗
LOTUSNatural Products (Wikidata)compounds↗
NPASSNat. Product Activity & Species Sourcecompounds↗
GRIN TaxonomyUSDA-ARSdistribution & uses↗
Open Tree of LifeOpenTreephylogeny backbone↗
CCDBChromosome Counts DB · Tel Aviv U.genome & karyotype↗
PloiDBPloidy Databasegenome & karyotype
WikidataWikimedia Foundationstructured facts↗