Hoary cress, commonly known as little whitetop, has arrowhead shaped leaves, and white 4-petal flowers.

A hoary cress seedling is a cluster of long, slightly serrated leaves.

 

Flowers will appear as small blue or purple balls before flowering out into many clustered white, 4 petaled flowers.

 

Hoary cress can be identified by the distinct arrowhead shaped leaves clasping the stem.