Wildflowers of Toronto's High Park​​

Burdock

Family: Composite/Aster
Genus: ​Arctium

​Introduced
Habitat: Waste places, disturbed forests

Biennial
Blooms: June to October

Phyllaries (bracts beneath flower head) have hooked tips.   

Fruit: A bristly bur which sticks to clothing and animal fur for seed dispersal.  

Burdock, common
​A. minus

​A bushy plant, up to 1.25 m tall.
Leaf stalk hollow

Flower head: up to 2.5 cm, disk flowers only

Burdock, great
​A. lappa

​Height: up to 2.5 m 

Flower head up to 3.8 cm​

Leaf stalk solid.