Alliaria petiolata
Description: Herbaceous, biennial, triangular to heart-shaped, button-like clusters of white flowers in spring and summer
Habitat: Well-drained soil, woodlands, native to Europe, Asia, Africa, western China
Field Notes: White tap-root smells like horseradish; chopped leaves used for flavoring in salads, sauces; many insects and fungus use as food
A Field Guide To Fieldston 
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