from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of several plants of the genera Spermacoce and Diodia, of the madder family.
from the GNU version of the Collaborative International Dictionary of English
- n. The name of several plants of the genera Spermacoce and Diodia, of the Madder family.
from The Century Dictionary and Cyclopedia
- n. A name given to several rubiaceous plants belonging to the genera Spermacoce, Diodia, and Borreria.
- n. The knapweed, Centaurea nigra.
button + weed (Wiktionary)