A plant with damp, sticky foliage or stems; possibly referring to certain coastal plant species with succulent leaves.
Compound of 'clammy' (sticky, moist) and 'weed' (a plant, especially one considered undesirable). Likely a folk or regional name for a plant with notably moist or sticky leaves.
Many salt-marsh plants have clammyweed-like succulent leaves that store water—this adaptation lets them survive in harsh coastal conditions where fresh water is scarce, making their stickiness actually a clever survival strategy.
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