The small marsh flower ''Cotula coronopifolia'' bears the common names brass buttons, golden buttons, and buttonweed. The
flower heads are bright yellow
discoid
Discoid may refer to:
* Disk (mathematics), the region in a plane enclosed by a circle
Medicine
* Furosemide, a medication sold under the trade name Discoid
* Discoid meniscus, a human anatomical variant
* Discoid lupus erythematosus, a chroni ...
heads 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
Africa is the world's second-largest and second-most populous continent, after Asia in both cases. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area ...
, as well as
New Zealand
New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island count ...
, but it has been introduced to other parts of the world (
Europe
Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a subcontinent of Eurasia and it is located entirel ...
,
North
North is one of the four compass points or cardinal directions. It is the opposite of south and is perpendicular to east and west. ''North'' is a noun, adjective, or adverb indicating direction or geography.
Etymology
The word ''north ...
+
South America
South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the sout ...
, etc.).
[Flora of North America, Brass-buttons, cotule, Cotula coronopifolia Linnaeus, Sp. Pl. 2: 892. 1753. ]
/ref>
Brass buttons are common plants that occupy a specialized ecological niche
In ecology, a niche is the match of a species to a specific environmental condition.
Three variants of ecological niche are described by
It describes how an organism or population responds to the distribution of resources and competitors (for ...
. They prefer muddy, anoxic
The term anoxia means a total depletion in the level of oxygen, an extreme form of hypoxia or "low oxygen". The terms anoxia and hypoxia are used in various contexts:
* Anoxic waters, sea water, fresh water or groundwater that are depleted of diss ...
wetland
A wetland is a distinct ecosystem that is flooded or saturated by water, either permanently (for years or decades) or seasonally (for weeks or months). Flooding results in oxygen-free (anoxic) processes prevailing, especially in the soils. The p ...
s and brackish water
Brackish water, sometimes termed brack water, is water occurring in a natural environment that has more salinity than freshwater, but not as much as seawater. It may result from mixing seawater (salt water) and fresh water together, as in estuari ...
. 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
Vernal pools, also called vernal ponds or ephemeral pools, are seasonal pools of water that provide habitat for distinctive plants and animals. They are considered to be a distinctive type of wetland usually devoid of fish, and thus allow the safe ...
ecosystems. Brass buttons are common along beaches, salt marsh
A salt marsh or saltmarsh, also known as a coastal salt marsh or a tidal marsh, is a coastal ecosystem in the upper coastal intertidal zone between land and open saltwater or brackish water that is regularly flooded by the tides. It is domin ...
es, and estuaries from California
California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m ...
to Washington
Washington commonly refers to:
* Washington (state), United States
* Washington, D.C., the capital of the United States
** A metonym for the federal government of the United States
** Washington metropolitan area, the metropolitan area centered o ...
.[ It has been present in the British Isles since the late 1800s, especially on the Cheshire coast and is considered a ]neophyte
A neophyte is a recent initiate or convert to a subject or belief.
Neophyte may also refer to:
Science
* Neophyte (botany), a plant species recently introduced to an area
As a proper noun Arts and entertainment
* Neophyte, a character class ...
naturalised plant.
Although brass buttons is known to be invasive, its spread appears to be relatively slow. Its California Invasive Plant Council Inventory rating is "limited", that is, "invasive but their ecological impacts are minor on a statewide level or there was not enough information to justify a higher score. Their reproductive biology and other attributes result in low to moderate rates of invasiveness. Ecological amplitude and distribution are generally limited, but these species may be locally persistent and problematic."California Invasive Plant Inventory Accessed Dec. 19, 2013
/ref>
Gallery
Cotula coronopifolia 108269598.jpg
Cotula coronopifolia 2.jpg
Cotula coronopifolia 7776.JPG, Leaves sheath the stem and are entire
Entire may refer to:
* Entire function, a function that is holomorphic on the whole complex plane
* Entire (animal), an indication that an animal is not neutered
* Entire (botany)
This glossary of botanical terms is a list of definitions of ...
or with a few teeth or deep lobes ( Fir Island, Washington
Washington commonly refers to:
* Washington (state), United States
* Washington, D.C., the capital of the United States
** A metonym for the federal government of the United States
** Washington metropolitan area, the metropolitan area centered o ...
)
Cotula coronopifolia - Flickr - Kevin Thiele.jpg
References
External links
Jepson Manual ''Cotula coronopifolia''
''Cotula coronopifolia'' occurrence data
from GBIF
The Global Biodiversity Information Facility (GBIF) is an international organisation that focuses on making scientific data on biodiversity available via the Internet using web services. The data are provided by many institutions from around the ...
*
{{Taxonbar, from=Q2998623
coronopifolia
Plants described in 1753
Taxa named by Carl Linnaeus
Flora of South Africa