Cotula coronopifolia
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Asterids
Order:	Asterales
Family:	Asteraceae
Subfamily:	Asteroideae
Tribe:	Anthemideae
Genus:	Cotula
Species:	C. coronopifolia
Binomial name
Cotula coronopifolia L.

The small marsh flower Cotula coronopifolia (also spelled C. coronipifolia) bears the common names brass buttons, golden buttons, and buttonweed. The flowers are bright yellow discoid inflorescences that look like thick buttons. Individual plants spread stems along the ground and send up the knobby flowers at intervals. The plant is native to southern Africa, but it has been introduced to many regions of the world.

Leaves sheath the stem and are entire or with a few teeth or deep lobes (Fir Island, Washington).

Brass buttons are common plants that occupy a specialized ecological niche. They prefer muddy, anoxic wetlands and brackish water. They are very salt-tolerant. The plant has fat, fleshy leaves that store water during times of saline inundation. The reddish stems and green, blade-shaped leaves are coated with a shiny cuticle to retain moisture. It can also be found in the wetter patches in vernal pool ecosystems. Brass buttons are common along the beaches, salt marshes, and estuaries from California to Washington.

External links [link]

• Jepson Manual Cotula coronopifolia

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