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The Collaborative International Dictionary
Senecio hieracifolius

Hawkweed \Hawk"weed`\ (-w[=e]d`), n. (Bot.)

  1. A plant of the genus Hieracium; -- so called from the ancient belief that birds of prey used its juice to strengthen their vision.

  2. A plant of the genus Senecio ( Senecio hieracifolius).
    --Loudon.