The Collaborative International Dictionary
Pinweed
Pinweed \Pin"weed`\, n. (Bot.) Any plant of the genus Lechea, low North American herbs with branching stems, and very small and abundant leaves and flowers.
Wiktionary
pinweed
n. Any plant of the genus (taxlink Lechea genus noshow=1), low North American herbs with branching stems, and very small and abundant leaves and flowers.