Summer form is whiter than the spring form. Found mainly along the southern border of Canada and the northern border of the US from the Dakotas eastward.
Mustard White (Pieris oleracea) Lanark Co., Ontario 13 July 2018
Mustard White (Pieris oleracea) Lanark Co., Ontario 13 July 2018
Mustard White (Pieris oleracea) Lanark Co., Ontario 13 July 2018