Canada Horseweed

Erigeron canadensis (Conyza canadensis; Erigeron c

General Status Rank: 
Alien
ELCODE: 
PDAST2J040
Common Name: 
Canada Horseweed
Scientific Name: 
Erigeron canadensis (Conyza canadensis; Erigeron c
Synonyms: 
Conyza canadensis
Erigeron canadensis
Naming References: 
B003
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Taxonomy
Group: 
Vascular Plant
Kingdom: 
Plantae
Phylum: 
Magnoliophyta
Class: 
Dicotyledoneae
Order: 
Asterales
Family: 
Asteraceae
References: 
B036
General Biology

Longevity

annual
References: 
B003
Habitat
roadside
References: 
B003
Distribution

Ecozones

Boreal Plains
References: 
B003

Distribution

expected (B003); In Ft Smith since 1966
Score: 
E
References: 
B003

Number of Occurrences

DAO-2; CAN-0 Number of occurrences (collections) recorded in Ottawa herbaria (some duplication of localities occurs between the two herbaria) DAO record:Ft. Smith, Cody, Aug 1966; Ft. Smith, Loan, Aug 1950 (H156)
Score: 
A
References: 
H156

Area of Occupancy

Score: 
-
Threats

Intrinsic Vulnerability

Score: 
-
General Status Rank
Rank: 
Alien
Status Rank Description: 
- A weedy species of disturbed sites, known from two collections around Ft. Smith.
S Rank: 
SNA
Decision Process Description: 
Drafted as May be at risk by E Haber; modified to Undetermined by S Carriere due to its habits and possibility of many other sites, and increasing distribution with increasing habitats.; Reviewed in 2015 by Marilyn Anions; no change
Last Updated: 
July 28, 2016

References

Ecozones

  • Porsild AE, and Cody WJ (1980) Vascular Plants of Continental Northwest Territories, Canada. National Museums of Canada RWED Library Call #QK203.N7P6http://ia601004.us.archive.org/22/items/vascularplantsof00pors/vascularplantsof00pors.pdf - B003 Return

Habitat

  • Porsild AE, and Cody WJ (1980) Vascular Plants of Continental Northwest Territories, Canada. National Museums of Canada RWED Library Call #QK203.N7P6http://ia601004.us.archive.org/22/items/vascularplantsof00pors/vascularplantsof00pors.pdf - B003 Return

Longevity

  • Porsild AE, and Cody WJ (1980) Vascular Plants of Continental Northwest Territories, Canada. National Museums of Canada RWED Library Call #QK203.N7P6http://ia601004.us.archive.org/22/items/vascularplantsof00pors/vascularplantsof00pors.pdf - B003 Return

Naming

  • Porsild AE, and Cody WJ (1980) Vascular Plants of Continental Northwest Territories, Canada. National Museums of Canada RWED Library Call #QK203.N7P6http://ia601004.us.archive.org/22/items/vascularplantsof00pors/vascularplantsof00pors.pdf - B003 Return

Number of Occurrences

  • Erich Haber (2005) Personal Communication-email to S Carriere on 05/01/2005 on Dicots 5. E-mail archive - H156 Return

Range Extent

  • Porsild AE, and Cody WJ (1980) Vascular Plants of Continental Northwest Territories, Canada. National Museums of Canada RWED Library Call #QK203.N7P6http://ia601004.us.archive.org/22/items/vascularplantsof00pors/vascularplantsof00pors.pdf - B003 Return

Taxonomy

  • McJannet CL, Argus GW and Cody WJ (1995) Rare Vascular Plants in the Northwest Territories. Canadian Museum of Nature Syllogeus 73:1-104. RWED Library Call #QK86.C3M3 - B036 Return