Home
Page Last Updated: January 16 2016
Aster Family 3
20 species
Updated January 16 2016
More Canada Thistle
More Canada Thistle
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)
Class: Magnoliopsida
Updated August 28 2010
More Field Sow Thistle
More Field Sow Thistle
Field Sow Thistle
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Sonchus
Species: Arvensis
Kingdom: Plantae
Division: Magnoliophyta
Perennial - also known as Perennial Sow Thistle - native
to Eurasia
Class: Magnoliopsida
Updated August 3 2013
More Common Sow Thistle
More Common Sow Thistle
Common Sow Thistle
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
Class: Magnoliopsida
Updated August 28 2010
More Spiny-leaved Sow Thistle
More Spiny-leaved Sow Thistle
Spiny-leaved Sow Thistle
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
Class: Magnoliopsida
Updated November 25 2014
More Spotted Knapweed
More Spotted Knapweed
Spotted Knapweed (2nd year)
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
Class: Magnoliopsida
Updated August 16 2012
More Common Burdock
More Common Burdock
Common Burdock
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Arctium
Species: Minus
Kingdom: Plantae
Division: Magnoliophyta
Biennial  - also known as Lesser Burdock - flower heads
are smaller and on shorther stalks compared to Great
Burdock (see below) - basal leaves have hollow stalks -
native to Eurasia
Class: Magnoliopsida
Updated November 25 2014
More Spotted Knapweed
More Spotted Knapweed
Spotted Knapweed
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
Class: Magnoliopsida
Updated August 21 2010
More Prickly Lettuce
More Prickly Lettuce
Prickly Lettuce
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Lactuca (Lettuce)
Species: Serriola
Kingdom: Plantae
Division: Magnoliophyta
Annual / Biennial - native to Europe
Class: Magnoliopsida
Updated October 12 2015
More White Lettuce
More White Lettuce
White Lettuce
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
Class: Magnoliopsida
Dense Blazing Star
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Liatris
Species: Spicata
Kingdom: Plantae
Class: Magnoliopsida
Division: Magnoliophyta (Flowering plants)
Updated December 29 2015
More Dense Blazing Star
More Dense Blazing Star
Perennial - also known as Spiked Blazing Star, Gay Feather
- native to eastern North America
Ontario Blazing Star
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
More Ontario Blazing Star
Perennial - also known as Cylindrical Blazing Star - native to
eastern North America
Updated February 10 2011
More Cocklebur
More Cocklebur
Cocklebur
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
More Tall Ironweed
Tall Ironweed
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
Class: Magnoliopsida
Updated November 25 2014
More Spotted Knapweed
More Spotted Knapweed
Spotted Knapweed (first year)
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
Class: Magnoliopsida
Updated March 24 2012
More Garden Cornflower
More Garden Cornflower
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
Class: Magnoliopsida
Burdock (Common or Great - see below) - 1st year
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Arctium
Species: Minus or Lappa
Kingdom: Plantae
Division: Magnoliophyta
Biennial  - native to Eurasia
Class: Magnoliopsida
Updated August 7 2012
More Great Burdock
More Great Burdock
Great Burdock
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Arctium
Species: Lappa
Kingdom: Plantae
Division: Magnoliophyta
Biennial  - flower heads are  larger and on longer stalks
compared to Common Burdock (see above) - basal leaves
have solid stalks - native to Eurasia
Class: Magnoliopsida
Updated September 21 2012
More Garden Cosmos
More Garden Cosmos
Garden Cosmos
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Cosmos
Species: Bipinnatus
Kingdom: Plantae
Division: Magnoliophyta
Annual - also known as Mexican Aster - many cultivars -
escaped ornamental that has become
naturalized - native
to Mexico
Class: Magnoliopsida
Updated June 28 2015
More Bull Thistle
More Bull Thistle
Bull Thistle
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Cirsium
Species: Vulgare
Kingdom: Plantae
Division: Magnoliophyta
Biennial - native to Eurasia and north Africa
Class: Magnoliopsida
Updated November 29 2015
More Nodding Thistle
More Nodding Thistle
Nodding Thistle
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Carduus
Species: Nutans
Kingdom: Plantae
Division: Magnoliophyta
Biennial / Perennial - also known as Nodding Plumeless
Thistle, Musk Thistle - native to Eurasia
Class: Magnoliopsida
Updated March 2 2014
More Plumeless Thistle
More Plumeless Thistle
Plumeless Thistle
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Carduus
Species: Acanthoides
Kingdom: Plantae
Division: Magnoliophyta
Biennial - also known as Spiny Plumeless Thistle, Welted
Thistle - flower may be white - native to Eurasia
Class: Magnoliopsida
Updated August 10 2014
More Wall Lettuce
More Wall Lettuce
Wall Lettuce
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Mycelis
Species: Muralis
Kingdom: Plantae
Division: Magnoliophyta
Annual / Biennial? - native to Eurasia
Class: Magnoliopsida
Updated August 10 2014
More Tall Blue Lettuce
More Tall Blue Lettuce
Tall Blue Lettuce
Order: Asterales
Family: Asteraceae (Aster family)
Genus: Lactuca (Lettuce)
Species: Biennis
Kingdom: Plantae
Division: Magnoliophyta
Annual / Biennial - also known as Biennial Lettuce -
native to North America
Class: Magnoliopsida
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
Common Sow Thistle - flower head approx. 2.5 cm - leaves to 25 cm - height to 1 m - Thorncliffe Park - June 2012
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
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
Common Burdock (1st and 2nd year) - flower head to 2.5 cm - leaves (basal) to 50 cm - height to 1.5 m - West Don Valley (Serena Gundy Park) - August 2012
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
Prickly Lettuce - flower head to 1 cm - leaves 5 to 30 cm - height to 1.5 m - High Park - August 2010
White Lettuce - flower head approx. 2 cm - leaves to 20 cm - height to 1.7 m - Lower Don Valley (Crother's Woods) - August 2010
Ontario Blazing Star - flower head approx. 2 cm - leaves (basal)  to 25 cm (decreasing with height) - height to 60 cm - High Park - August 2010
Cocklebur - flower head to 4 cm - leaves to 15 cm - height to 1.5 m - Guildwood Park - September 2010
Tall Ironweed - flower head 1 to 2 cm - leaves 15 to 25 cm - height to 2 m - Kortright Centre for Conservation - September 2010
Spotted Knapweed (first year) - leaves to 15 cm - Humber Bay Park - November 2011
Garden Cornflower - flower head to 7 cm - leaves to 10 cm - height to 90 cm - Leslie Spit - October 2007
Burdock (1st year) - West Don Valley (Sunnybrook Park) - May 2009
Great Burdock - flower head to 4 cm - leaves (basal) to 80 cm - height to 3 m - East Don Valley (Charles Sauriol Conservation Area) - July 2012
Garden Cosmos - flower head to 8 cm - leaves to 25 cm - height to 1.2 m - East Don Valley (Charles Sauriol Conservation Area) - September 2012
Bull Thistle - flower head to 7 cm - leaves to 15 cm - height to 1.5 m - Lower Don Valley (Crother's Woods) - August 2013
Nodding Thistle - flower head to 7 cm - lower leaves to 60 cm - height to 1.5 m - Leslie Spit - June 2010
Plumeless Thistle - flower head to 2.5 cm - lower leaves to 20 cm - height to 2 m - Humber Bay Park - September 2009
Wall Lettuce - flower head approx. 1 cm - leaves to 20 cm - height to 1 m - West Don Valley (Sunnybrook Park) - June 2014
Tall Blue Lettuce - flower head approx. 1 cm - leaves to 40 cm - height to 3 m - Rouge Park - August 2014
Dense Blazing Star - flower approx. 6 mm - spike to 30 cm - leaves (basal)  to 30 cm (decreasing with height) - height to 1.8 m - Rouge Park - August 2015
Canada Thistle - flower head approx. 2 cm - leaves 12 to 20 cm - height 30 to 150 cm - Lower Don Valley (Crother's Woods) - June 2012