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.

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

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