Wildflowers of Toronto's High Park​​

Pennycress, field or Stinkweed
​Thlaspi arvense

​Family: Mustard
Annual 
Introduced 

Blooms: April to October
Habitat: Fields and waste places 

Height: up to 60 cm

Stem: Smooth
​Flowers: tiny in terminal cluster
 
Fruits: roundish, broad-winged pods, deeply notched at the tip

​Has a strong turnip-like odour.