名詞 butterweed:

1. American ragwort with yellow flowers
   同義詞：ragwort, Senecio glabellus
2. any of several yellow-flowered plants of the genus Packera; often placed in genus Senecio

but.ter.weed

n.（名詞）
A succulent annual or biennial plant(Senecio glabellus), native to the eastern United States and having pinnately divided leaves and bright yellow, radiate flower heads.
千里光屬植物：一種一年或兩年生的多汁植物（美洲千里光 千里光屬） ，產(chǎn)于美國東部，生有羽狀裂葉和亮黃色輻射狀花冠
The horseweed.
加拿大飛蓬