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Page Last Updated: March 24 2012
Aster Family 3
13 species
Updated January 17 2010
More Canada Thistle
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Cirsium
Species: Arvense
Kingdom: Plantae
Division: Magnoliophyta
Perennial - flower may be white - native to Europe
(despite its name)
(despite its name)
Class: Magnoliopsida
Updated August 28 2010
More Field Sow Thistle
Field Sow Thistle - flower head 3 to 5 cm - leaves 6 to 40 cm - height to 2 m - Lower Don Valley (Crother's Woods) - August 2010
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Sonchus
Species: Arvensis
Kingdom: Plantae
Division: Magnoliophyta
Perennial - also known as Perennial Sow Thistle - native
to Eurasia
to Eurasia
Class: Magnoliopsida
Updated August 26 2010
More Common Sow Thistle
Common Sow Thistle - flower head approx. 2.5 cm - leaves to 25 cm - height to 1 m - Lower Don Valley (Crother's Woods) - August 2010
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Sonchus
Species: Oleraceus
Kingdom: Plantae
Division: Magnoliophyta
Annual - also known as Annual Sow Thistle, Hare's Thistle -
native to Eurasia and North Africa
native to Eurasia and North Africa
Class: Magnoliopsida
Updated August 28 2010
More Spiny-leaved Sow Thistle
Spiny-leaved Sow Thistle - flower head approx. 2.5 cm - leaves to 25 cm - height to 1.8 m - Lower Don Valley (Leaside) - July 2010
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Sonchus
Species: Asper
Kingdom: Plantae
Division: Magnoliophyta
Annual - also known as Prickly Sow Thistle - native to
Eurasia and north Africa
Eurasia and north Africa
Class: Magnoliopsida
Updated August 14 2011
More Spotted Knapweed
Spotted Knapweed (2nd year) - flower head to 2.5 cm - leaves 10 to 25 cm (basal), smaller (stem) - height to 1.2 m - Lower Don Valley (Crother's Woods) - July 2009
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Centaurea
Species: Maculosa
Kingdom: Plantae
Division: Magnoliophyta
Biennial / Perennial - "biebersteinii" and "stoebe"
(sub-species "micranthos") also used as species name -
possibly Brown (or Brownray) Knapweed (Centaurea jacea)
- native to Europe
(sub-species "micranthos") also used as species name -
possibly Brown (or Brownray) Knapweed (Centaurea jacea)
- native to Europe
Class: Magnoliopsida
Updated January 18 2010
More Common Burdock
Common Burdock - flower head 1 to 3 cm - leaves to 50 cm (basal), smaller (stem) - height to 1.5 m - Leslie Spit - August 2009
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Arctium
Species: Minus
Kingdom: Plantae
Division: Magnoliophyta
Biennial - native to Eurasia
Class: Magnoliopsida
Updated August 14 2011
More Spotted Knapweed
Spotted Knapweed - flower head to 2.5 cm - leaves 10 to 25 cm (basal), smaller (stem) - height to 1.2 m - Leslie Spit - May 2011
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Centaurea
Species: Maculosa
Kingdom: Plantae
Division: Magnoliophyta
Biennial / Perennial - "biebersteinii" and "stoebe"
(sub-species "micranthos") also used as species name -
possibly Brown (or Brownray) Knapweed (Centaurea jacea)
- native to Europe
(sub-species "micranthos") also used as species name -
possibly Brown (or Brownray) Knapweed (Centaurea jacea)
- native to Europe
Class: Magnoliopsida
Updated August 21 2010
More Prickly Lettuce
Prickly Lettuce - flower head to 1 cm - leaves 5 to 30 cm - height to 1.5 m - High Park - August 2010
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Lactuca (Lettuce)
Species: Serriola
Kingdom: Plantae
Division: Magnoliophyta
Annual / Biennial - native to Europe
Class: Magnoliopsida
Updated October 16 2011
More White Lettuce
White Lettuce - flower head approx. 2 cm - leaves to 20 cm - height to 1.7 m - Lower Don Valley (Crother's Woods) - August 2010
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Prenanthes
Species: Alba
Kingdom: Plantae
Division: Magnoliophyta
Perennial - also known as White Rattlesnake Root -
native to eastern North America
native to eastern North America
Class: Magnoliopsida
Dense Blazing Star - flower approx. 6 mm - spike to 30 cm - leaves (basal) to 30 cm (decreasing with height) - height to 1.8 m - East Don Valley (Milne Hollow) - July 2010
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Liatris
Species: Spicata
Kingdom: Plantae
Class: Magnoliopsida
Division: Magnoliophyta (Flowering plants)
Updated August 1 2010
More Dense Blazing Star
Perennial - also known as Spiked Blazing Star, Gay Feather
- native to eastern North America
- native to eastern North America
Ontario Blazing Star - flower head approx. 2 cm - leaves (basal) to 25 cm (decreasing with height) - height to 60 cm - High Park - August 2010
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Liatris
Species: Cylindracea
Kingdom: Plantae
Class: Magnoliopsida
Division: Magnoliophyta (Flowering plants)
Updated August 21 2010
More Ontario Blazing Star
Perennial - also known as Cylindrical Blazing Star - native to
eastern North America
eastern North America
Updated February 10 2011
More Cocklebur
Cocklebur - flower head to 4 cm - leaves to 15 cm - height to 1.5 m - Guildwood Park - September 2010
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Xanthium
Species: Strumarium
Kingdom: Plantae
Division: Magnoliophyta
Annual - also known as Clotbur - native to North America
Class: Magnoliopsida
Updated March 18 2011
More Tall Ironweed
Tall Ironweed - flower head 1 to 2 cm - leaves 15 to 25 cm - height to 2 m - Kortright Centre for Conservation - September 2010
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Vernonia
Species: Gigantea (formerly Altissima)
Kingdom: Plantae
Division: Magnoliophyta
Perennial - also known as Giant Ironweed - native to
eastern North America
eastern North America
Class: Magnoliopsida
Updated August 14 2011
More Spotted Knapweed
Spotted Knapweed (first year) - leaves to 15 cm - Humber Bay Park - November 2011
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Centaurea
Species: Maculosa
Kingdom: Plantae
Division: Magnoliophyta
Biennial / Perennial - "biebersteinii" and "stoebe"
(sub-species "micranthos") also used as species name -
possibly Brown (or Brownray) Knapweed (Centaurea jacea)
- native to Europe
(sub-species "micranthos") also used as species name -
possibly Brown (or Brownray) Knapweed (Centaurea jacea)
- native to Europe
Class: Magnoliopsida
Canada Thistle - flower head approx. 2 cm - leaves 12 to 20 cm - height 30 to 150 cm - Richmond Hill (Beaver Creek) - June 2009
Updated March 24 2012
More Garden Cornflower
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Centaurea
Species: Cyanus
Kingdom: Plantae
Division: Magnoliophyta
Annual - also known as Bachelor's Buttons - many cultivars
- native to Europe
- native to Europe
Class: Magnoliopsida
Garden Cornflower - flower head to 7 cm - leaves to 10 cm - height to 90 cm - Leslie Spit - October 2007