A plant (such as certain species of orache or glasswort) that produces a crunching sound when walked on or chewed due to its crystalline salt deposits on the leaves.
From crunch + weed (Old English weod, meaning plant). The name refers to the distinctive sound the plant makes, combining the descriptive onomatopoeia with a simple plant designation.
Many salt marsh plants actually accumulate sodium crystals on their surfaces as an adaptation to salty soil—when you walk on them, you're hearing the crystals break, not the plant tissue itself!
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