[Klam.ath weed] n [Klamath (River)] (1922): a European yellow-flowered perennial Saint-John's-wort (Hypericum perforatum) that is naturalized in No. America esp. in rangelands
KLAMATH WEED
Meaning of KLAMATH WEED in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012