Klamath weed

noun

1. the St.-John's-wort, Hypericum perforatum.

Word History and Origins

Origin of Klamath weed¹

1920–25, Americanism; named after the Klamath River

Example Sentences

In Europe the Klamath weed, or St. Johnswort, has never become a problem because along with the plant there have developed various species of insects; these feed on it so extensively that its abundance is severely limited.

From Literature

A ten-year survey completed in 1959 showed that control of the Klamath weed had been “more effective than hoped for even by enthusiasts,” with the weed reduced to a mere 1 per cent of its former abundance.

From Literature

Land values declined accordingly, for the Klamath weed was considered to hold the first mortgage.

From Literature

Klamath weed, quite unlike such native plants as sagebrush, has no place in the ecology of the region, and no animals or other plants require its presence.

From Literature

Within small areas the beetles accomplish their own dispersion, moving on as soon as the Klamath weed dies out and locating new stands with great precision.

From Literature