Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A succulent annual or biennial plant (Senecio glabellus) of the composite family, native to the eastern United States and having pinnately divided leaves and bright yellow flowers.
  • noun The horseweed.

from The Century Dictionary.

  • noun A common name of the horseweed, Erigeron Canadense, and of the Senecio lobatus.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Bot.) An annual composite plant of the Mississippi valley (Senecio lobatus).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Any of various herbaceous flowering plants in the genus Conyza.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun American ragwort with yellow flowers
  • noun any of several yellow-flowered plants of the genus Packera; often placed in genus Senecio

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

butter +‎ weed

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Examples

  • Common herbs include butterweed (Senecio glabellus), jewelweed (Impatiens capensis), and royal fern (Osmunda regalis).

    Mississippi lowland forests 2007

  • Up close they were head-high in a riot of color: red paintbrush, lavender fleabane, hot-pink fireweed, white cow parsnip, lacy green false hellebore, the flashy red of chokecherries, white pearls of baneberry, rich purple huckleberries, fierce yellows of butterweed and arnica.

    Blood Lure Barr, Nevada 2001

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