Image of Canadian Horseweed

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Canadian Horseweed

Erigeron canadensis L.

2012 Richard Spellenberg cc-by-nc-sa-3.0

Erigeron canadensis (Canadian Horseweed) is a species of shrub in the family Asteraceae. They have a self-supporting growth form. They are native to Canada, Caatinga, Cerrado, GoiáS, Eastern North America, US Minor Outlying Islands, Pampa, SãO Paulo, U.S. Virgin Islands, Amazônia, The Contiguous United States, Western North America, Distrito Federal, Pantanal, Mata Atlântica, Rio Grande Do Sul, Rio De Janeiro, Minas Gerais, Puerto Rico, Paraná, Saint-Pierre Et Miquelon, Santa Catarina, and Bahia. They have simple, broad leaves, white flowers, and achenes. Flowers are visited by Ruby-Crowned Kinglet, Yellowjackets, Syritta pipiens, and 7-spot ladybird. Individuals can grow to 5 feet.

URI: http://purl.obolibrary.org/obo/FLOPO_0900034
Definition: whole plant frutescent, bush, shrub

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URI: http://eol.org/schema/terms/self-supportingGrowthForm
Definition: an organism relying on its own supportive tissues rather than a climbing habit to achieve vertical growth

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URI: http://www.geonames.org/6251999

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URI: https://www.wikidata.org/entity/Q375816

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URI: https://www.wikidata.org/entity/Q278512
Definition: tropical savanna ecoregion of Brazil

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URI: http://www.geonames.org/3462372

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URI: https://eol.org/schema/terms/eastern_north_america
Definition: From the Atlantic to central North America. May include Saskatchewan, Texas, and/or Guanajuato

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URI: http://www.geonames.org/5854968

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URI: https://www.wikidata.org/entity/Q184382

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URI: https://www.geonames.org/3448433

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URI: http://www.geonames.org/4796775

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URI: https://www.wikidata.org/entity/Q2841453

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URI: http://www.wikidata.org/entity/Q578170

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URI: https://eol.org/schema/terms/western_north_america
Definition: From the Pacific to central North America. May include Saskatchewan, Texas, and/or Guanajuato

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URI: https://www.geonames.org/3463504

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URI: https://www.wikidata.org/entity/Q157603
Definition: tropical wetland mostly within Brazil, and portions in Bolivia and Paraguay

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URI: https://www.wikidata.org/entity/Q477047

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URI: https://www.geonames.org/3451133

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URI: https://www.geonames.org/3451189

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URI: https://www.geonames.org/3457153

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URI: http://www.geonames.org/4566966

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URI: https://www.geonames.org/3455077

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URI: http://www.geonames.org/3424932

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URI: https://www.geonames.org/3450387

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URI: https://www.geonames.org/3471168

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URI: http://purl.obolibrary.org/obo/PO_0020042
Definition: A leaf in which the lamina is undivided

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URI: http://purl.obolibrary.org/obo/PATO_0002359
Definition: A quality inhering in a bearer by virtue of the bearer's width being notably higher than its length.

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URI: http://purl.obolibrary.org/obo/PATO_0000323
Definition: An achromatic color of maximum brightness; the color of objects that reflect nearly all light of all visible wavelengths.
Attribution: [database_cross_reference: Dictionary:http://dictionary.reference.com/]

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URI: http://purl.obolibrary.org/obo/PO_0030107
Definition: a fruit which develops from a carpel or gyneocium and at maturity comprises a dry exocarp, a dry mesocarp, and a dry endocarp that are connected to a seed coat by a funicle

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EOL has data for 79 attributes, including:

after harvest regrowth rate
- URI: http://eol.org/schema/terms/AfterHarvestRegrowthRate
- Definition: Indicates the relative rate of regrowth of a herbaceous plant after a harvest of above ground herbage.
- Attribution: USDA PLANTS database Characteristics Data Fields. http://plants.usda.gov/charinfo.html
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slow
- URI: http://purl.obolibrary.org/obo/PATO_0000911
- Definition: Decreased rate. A rate which is relatively low.
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anaerobic soil tolerance
- URI: http://eol.org/schema/terms/AnaerobicSoilTolerance
- Definition: The relative tolerance of the plant to anaerobic soil conditions.
- Attribution: USDA PLANTS database Characteristics Data Fields. http://plants.usda.gov/charinfo.html
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low tolerance
- URI: http://purl.obolibrary.org/obo/PATO_0002394
- Definition: decreased tolerance to: A tolerance quality inhering in a bearer by virtue of the bearer's decreased ability to endure a stimulus.
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has dispersal vector
- URI: http://eol.org/schema/terms/HasDispersalVector
- Definition: which agent of biological dispersal moves a dispersal unit, or organism, away from its birth population to another location or population in which the individual will reproduce.
- Attribution: https://en.wikipedia.org/wiki/Dispersal_vector
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anemochory
- URI: http://eol.org/schema/terms/anemochory
- Definition: Seed dispersal by wind (with wind dispersal adaptations, such as pappus or wings).
- Attribution: http://www.uv.es/jgpausas/brot.htm
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calcareous soil tolerance
- URI: http://eol.org/schema/terms/CalcareousSoilTolerance
- Definition: The relative tolerance of the plant to calcareous soil. Calcareous soil is defined as soil containing sufficient free CaCO3 and other carbonates to effervesce visibly or audibly when treated with cold 0.1M HCl. These soils usually contain from 10 to almost 1000g/kg CaCO3 equivalent.
- Attribution: USDA PLANTS database Characteristics Data Fields. http://plants.usda.gov/charinfo.html
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low tolerance
- URI: http://purl.obolibrary.org/obo/PATO_0002394
- Definition: decreased tolerance to: A tolerance quality inhering in a bearer by virtue of the bearer's decreased ability to endure a stimulus.
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fire resistance
- URI: http://eol.org/schema/terms/FireResistance
- Definition: The ability of an organism to resist burning.
- Comment: If a plant can carry a fire—and most can—it is scored as "not fire resistant" in the USDA PLANTS database where this characteristic is evaluated with reference to problem fires in California. http://plants.usda.gov/charinfo.html
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no
- URI: http://eol.org/schema/terms/no
- Definition: This statement is false; the answer to this question is no.
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fire tolerance
- URI: http://eol.org/schema/terms/FireTolerance
- Definition: The relative ability of a plant to resprout, regrow, or reestablish from residual seed after a fire.
- Attribution: USDA PLANTS database Characteristics Data Fields (Fire tolerance). http://plants.usda.gov/charinfo.html
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low tolerance
- URI: http://purl.obolibrary.org/obo/PATO_0002394
- Definition: decreased tolerance to: A tolerance quality inhering in a bearer by virtue of the bearer's decreased ability to endure a stimulus.
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fruit or seed color
- URI: http://eol.org/schema/terms/FruitSeedColor
- Definition: The predominant and conspicuous color of the mature fruit or seed from a landscaping aesthetics standpoint.
- Attribution: USDA Plants database. Characteristics Data Fields. http://plants.usda.gov/charinfo.html
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brown
- URI: http://purl.obolibrary.org/obo/PATO_0000952
- Definition: A color consisting of dark orange, red, of very low intensity.
- Attribution: [database_cross_reference: Wikipedia:http://en.wikipedia.org/wiki/Brown]
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geographic distribution includes
- URI: http://eol.org/schema/terms/Present
- Definition: This organism is known to be present in this location or region. Not exclusive; other regions may also be reported.
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Virgin Islands
- URI: http://www.geonames.org/3577322
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native range includes
- URI: http://eol.org/schema/terms/NativeRange
- Definition: Lists jurisdictions in which a given organism is a member of the undisturbed fauna or flora.
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US Minor Outlying Islands
- URI: http://www.geonames.org/5854968
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post-fire seedling emergence
- URI: http://eol.org/schema/terms/PostFireSeedlingEmergence
- Definition: Seedling density per pre-fire mature individuals emerging during the first year after fire (seedlings/mature).
- Attribution: BROT trait database. Traits: units and categories (SeedlEmerg), http://www.uv.es/jgpausas/brot.htm
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yes
- URI: http://purl.bioontology.org/ontology/SNOMEDCT/373066001
- Attribution: http://ihtsdo.org
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precipitation tolerance
- URI: http://eol.org/schema/terms/PrecipitationTolerance
- Definition: Minimum tolerable rainfall (in inches), expressed as the average annual minimum precipitation that occurs 20% of the time (i.e., the probability of it being this dry in any given year is 20%) at the driest climate station within the known geographical range of the plant. geographical range of the plant. For cultivars, the geographical range is defined as the area to which the cultivar is well adapted rather than marginally adapted.
- Comment: Minimum precipitation tolerance: Minimum tolerable rainfall, expressed as the average annual minimum precipitation that occurs 20% of the time (i.e., the probability of it being this dry in any given year is 20%) at the driest climate station within the known geographical range of the plant. Maximum precipitation tolerance: Maximum tolerable rainfall, expressed as the annual average precipitation of the wettest climate station within the known geographical range of the plant. For cultivars, the geographical range is defined as the area to which the cultivar is well adapted rather than marginally adapted.
- Attribution: USDA PLANTS database Characteristics Data Fields. http://plants.usda.gov/charinfo.html
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55 inch
resprout ability after fire
- URI: http://eol.org/schema/terms/RespFire
- Definition: Resprouting ability one year after being ca. 100% scorched or burned by fire.
- Attribution: BROT trait database. Traits: units and categories (RespFire), http://www.uv.es/jgpausas/brot.htm;
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none
- URI: http://purl.bioontology.org/ontology/SNOMEDCT/260413007
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Known occurrences, collected specimens and observations of Canadian Horseweed. View this species on GBIF

2012 Richard Spellenberg cc-by-nc-sa-3.0