A legume plant with clustered, head-like flowers that resemble a rooster's comb or head, used historically as a forage crop.
From 'cock' (rooster) + 'head' (the plant's seed head or flower cluster). The name describes the distinctive clustered appearance of the plant's flowering parts.
Medieval farmers grew this plant specifically because it grew well in poor soil and animals loved eating it—the name stuck because farmers thought the weird flower clusters looked like a rooster's head.
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