Wildflowers of Toronto's High Park​​

Mustard, wormseed
​Erysimum cheiranthoides

​Family: Mustard
Annual
Introduced 

Blooms: June to September
Habitat: Waste areas

Height: up to 1 m

Flowers: 6-10 mm
 
Fruits: 1.5 - 2.5 cm long capsules
resembling a shepherd's purse.