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What are forbs? A more common term for them is "weed". A forb is a non-wooded, broad leaved plant other than grass, especially one growing in a field, prarie, or meadow. A scientific definition would be "herbaceous plant other than those in the Gramineae (truee grasses), Cyperaceae (sedges), and Juncaceae (rushes) families, ie., any nongrass-like plant having little or no woody material". Click on each forb for more information.