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Matricaria discoidea, commonly known as pineapple weed and disc mayweed is an annual plant
Annual plant

An annual plant is a plant that usually germinates flowers and dies in one year. True annuals will only live longer than a year if they are prevented from setting seed....
 native to North America
North America

North America is the northern continent of the Americas, situated in the Earth's northern hemisphere and almost totally in the western hemisphere....
 and NE Asia
Asia

Asia is the world's largest and most populous continent. It covers 8.6% of the Earth's total surface area and, with over 4 billion people, it contains more than 60% of the world's current human population....
 but which has become a cosmopolitan
Cosmopolitan distribution

In biogeography, a biological category of living things is said to have cosmopolitan distribution if this category can be found almost anywhere around the world....
 weed
WEED

WEED is a radio station broadcasting a Gospel format. Licensed to Rocky Mount, North Carolina, USA, it serves the area. The station is currently owned by Northstar Broadcasting Corporation....
. It is in the family Asteraceae
Asteraceae

The family Asteraceae or Compositae is the largest family of flowering plants, in terms of number of species.The name 'Asteraceae' is derived from the type genus Aster , while 'Compositae', an older but still valid name, means composite and refers to the characteristic inflorescence, a special type of pseudanthium found in o...
. The flower
Flower

A flower, sometimes known as a bloom or blossom, is the reproduction structure found in flowering plants . The biological function of a flower is to mediate the union of male sperm with female ovum in order to produce seeds....
s exude a chamomile/pineapple aroma when crushed. They are edible and have been used in salads (although they may become bitter by the time the plant blooms) and to make a herbal tea. Pineapple weed has been used for medicinal purposes, including for relief of gastrointestinal upset, infected sores, fevers, and postpartum anemia.

flower head
Inflorescence

An inflorescence is a group or cluster of flowers arranged on a Plant stem that is composed of a main branch or a complicated arrangement of branches....
 is cone-shaped, composed of dense-packed yellowish-green corollas, and lacking ray-florets.






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Matricaria discoidea, commonly known as pineapple weed and disc mayweed is an annual plant
Annual plant

An annual plant is a plant that usually germinates flowers and dies in one year. True annuals will only live longer than a year if they are prevented from setting seed....
 native to North America
North America

North America is the northern continent of the Americas, situated in the Earth's northern hemisphere and almost totally in the western hemisphere....
 and NE Asia
Asia

Asia is the world's largest and most populous continent. It covers 8.6% of the Earth's total surface area and, with over 4 billion people, it contains more than 60% of the world's current human population....
 but which has become a cosmopolitan
Cosmopolitan distribution

In biogeography, a biological category of living things is said to have cosmopolitan distribution if this category can be found almost anywhere around the world....
 weed
WEED

WEED is a radio station broadcasting a Gospel format. Licensed to Rocky Mount, North Carolina, USA, it serves the area. The station is currently owned by Northstar Broadcasting Corporation....
. It is in the family Asteraceae
Asteraceae

The family Asteraceae or Compositae is the largest family of flowering plants, in terms of number of species.The name 'Asteraceae' is derived from the type genus Aster , while 'Compositae', an older but still valid name, means composite and refers to the characteristic inflorescence, a special type of pseudanthium found in o...
. The flower
Flower

A flower, sometimes known as a bloom or blossom, is the reproduction structure found in flowering plants . The biological function of a flower is to mediate the union of male sperm with female ovum in order to produce seeds....
s exude a chamomile/pineapple aroma when crushed. They are edible and have been used in salads (although they may become bitter by the time the plant blooms) and to make a herbal tea. Pineapple weed has been used for medicinal purposes, including for relief of gastrointestinal upset, infected sores, fevers, and postpartum anemia.

Description

The flower head
Inflorescence

An inflorescence is a group or cluster of flowers arranged on a Plant stem that is composed of a main branch or a complicated arrangement of branches....
 is cone-shaped, composed of dense-packed yellowish-green corollas, and lacking ray-florets. The leaves
Leaf

In botany, a leaf is an above-ground plant Organ specialized for photosynthesis. For this purpose, a leaf is typically flat and thin, to expose the cells containing chloroplast to light over a broad area, and to allow light to penetrate fully into the tissues....
 are pinnately dissected and sweet-scented when crushed. The plant grows 3 to 12 inches (7.5 - 30 cm) high.

Distribution

The plant grows well in disturbed areas, especially those with poor, compacted soil
Soil

Soil is the naturally occurring, unconsolidated or loose covering on the Earth's surface. Soil is composed of particles of broken rock that have been altered by chemical and environmental processes including weathering and erosion....
. It can be seen blooming on footpaths, roadsides, and similar places in spring and early summer. In the USA, it can be found from central Alaska
Alaska

Alaska is the largest U.S. state of the United States by area; it is situated in the northwest extremity of the North American continent, with Canada to the east, the Arctic Ocean to the north, and the Pacific Ocean to the west and south, with Russia further west across the Bering Strait....
 down to California
California

California is a U.S. state on the West Coast of the United States of the United States, along the Pacific Ocean. It is bordered by Oregon to the north, Nevada to the east, Arizona to the southeast, and to the south the Mexico state of Baja California....
 and all the way to Maine
Maine

The State of Maine is a U.S. state in the New England region of the northeastern United States of America, bordering the Atlantic Ocean to the southeast, New Hampshire to the southwest, the Canadian provinces of Quebec to the northwest and New Brunswick to the northeast....
.

Native
;Palearctic
Palearctic

The Palearctic or Palaearctic is one of the eight ecozones dividing the Earth surface.Physically, the Palearctic is the largest ecozone....
Soviet Far East: Amur Oblast
Amur Oblast

Amur Oblast is a federal subjects of Russia of Russia , situated about 8,000 km east of Moscow on the banks of the Amur River and Zeya Rivers....
, Kamchatka Peninsula
Kamchatka Peninsula

The Kamchatka Peninsula is a 1,250-kilometer long peninsula in the Russian Far East, with an area of 472,300 km?. It lies between the Pacific Ocean to the east and the Sea of Okhotsk to the west....
, Khabarovsk Krai
Khabarovsk Krai

Khabarovsk Krai is a federal subjects of Russia of Russia , located in the Russian Far East. It lies mostly in the drainage basin of the lower Amur River, but also occupies a vast mountainous area along the coastline of the Sea of Okhotsk, an arm of the Pacific Ocean....
, Kuril Islands
Kuril Islands

The Kuril Islands or Kurile Islands in Russia's Sakhalin Oblast region, is a volcanic archipelago that stretches approximately 1,300 km northeast from Hokkaido, Japan, to Kamchatka Peninsula, Russia, separating the Sea of Okhotsk from the North Pacific Ocean....
, Magadan Oblast
Magadan Oblast

Magadan Oblast is a federal subjects of Russia of Russia in the Far Eastern Federal District federal districts of Russia. Its administrative center is the city of Magadan....
, Primorsky Krai
Primorsky Krai

Primorsky Krai also known as Primorye , is a federal subjects of Russia of Russia . Primorsky means "maritime" in Russian, hence the region is sometimes referred to as Maritime Province....
, Sakhalin
Sakhalin

Sakhalin , also Saghalien, is a large elongated island in the North Pacific, lying between 45?50' and 54?24' N. It is part of Russia and is its largest island, administered as part of Sakhalin Oblast....
 Eastern Asia: Hokkaido
Hokkaido

, formerly known as Ezo, Yezo, Yeso, or Yesso, is Japan's second largest island and the largest, northernmost of its 47 prefectures of Japan....
;Nearctic
Nearctic

The Nearctic is one of the eight Terrestrial ecoregion ecozones dividing the Earth's land surface.The Nearctic ecozone covers most of North America, including Greenland and the highlands of Mexico....
Subarctic America: Yukon Territory, Alaska
Alaska

Alaska is the largest U.S. state of the United States by area; it is situated in the northwest extremity of the North American continent, with Canada to the east, the Arctic Ocean to the north, and the Pacific Ocean to the west and south, with Russia further west across the Bering Strait....
 Western Canada: Alberta
Alberta

Alberta is one of Canada Canadian Prairies Provinces and territories of Canada. It became a province on September 1, 1905.Alberta is located in western Canada, bounded by the provinces of British Columbia to the west and Saskatchewan to the east, the Northwest Territories to the north, and the U.S....
, British Columbia
British Columbia

British Columbia is the westernmost of Canada's Provinces and territories of Canada and is famed for its natural beauty, as reflected in its Latin motto, Splendor sine occasu ....
 Northwestern United States: Colorado
Colorado

The State of Colorado is a U.S. state located in the Mountain States of the United States of America. Colorado may also be considered to be a part of the Western United States and Southwestern United States regions of the United States....
, Idaho
Idaho

The State of Idaho is a U.S. state in the Pacific Northwest region of the United States of America. The state's largest city and Capital is Boise, Idaho....
, Montana
Montana

Montana is a U.S. state in the Western United States. The western third of the state contains numerous mountain ranges; other 'island' ranges are found in the central third of the state, for a total of 77 named ranges of the Rocky Mountains....
, Oregon
Oregon

Oregon is a U.S. state in the Pacific Northwest region of the United States. The area was inhabited by many indigenous tribes before the arrival of traders, explorers and settlers....
, Washington
Washington

Washington is a U.S. state in the Pacific Northwest region of the United States. Washington was carved out of the western part of Washington Territory which had been ceded by Britain in 1846 by the Oregon Treaty as settlement of the Oregon Boundary Dispute....
, Wyoming
Wyoming

The State of Wyoming is a sparsely populated U.S. state in the Northwestern United States of the United States. The majority of the state is dominated by the mountain ranges and rangelands of the Rocky Mountains, while the easternmost section of the state is a high altitude prairie region known as the High Plains ....
 Southwestern United States: Arizona
Arizona

The State of Arizona is a U.S. state located in the Southwestern United States of the United States. The capital and largest city is Phoenix, Arizona....
, California
California

California is a U.S. state on the West Coast of the United States of the United States, along the Pacific Ocean. It is bordered by Oregon to the north, Nevada to the east, Arizona to the southeast, and to the south the Mexico state of Baja California....
, Nevada
Nevada

Nevada is a U.S. state located in the Western United States of the United States of America. The capital is Carson City and the largest city is Las Vegas, Nevada....
, Utah
Utah

The State of Utah is a western United States U.S. state of the United States. It was the List of U.S. states by date of statehood admitted to the United States on January 4, 1896....
 Mexico Northwest: Baja California
Baja California

Baja California is the northernmost States of Mexico of Mexico. Before becoming a state in 1953, the area was known as the North Territory of Baja California....

External links

  • Robbins, W. W., Margaret K. Bellue, and Walter S. Ball. 1970. Weeds of California. Documents and Publications, Sacramento. 547 p.
  • Gregory L. Tilford. 1997. Edible and Medicinal Plants of the West. Mountain Press Publishing Company, Missoula. 110 p.
  • , Statewide Integrated Pest Management Program