What does "clammyweed" mean?

Any of several North American plants of the genus Polanisia.

Clammyweed

Common synonyms include: clammy weed, mucilaginous weed, polanisia dodecandra, polanisia graveolens, wetland weed.

noun

noun ·Rare ·Advanced level

Noun

1
Any of several North American plants of the genus Polanisia. countable, uncountable
2
strong-scented herb common in southern United States covered with intermixed gland and hairs wordnet

From clammy + weed, from the sticky residue on the leaves.