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is a seed
A seed is a small embryonic plant enclosed in a covering called the seed coat, usually with some stored food. It is the product of the ripened ovule of gymnosperm and angiosperm plants which occurs after fertilization and some growth within the mother plant...
or dry fruit
In broad terms, a fruit is a structure of a plant that contains its seeds.The term has different meanings dependent on context. In non-technical usage, such as food preparation, fruit normally means the fleshy seed-associated structures of certain plants that are sweet and edible in the raw state,...
in which the seeds bear hooks or teeth which attach themselves to fur or clothing of passing animals or people. The hooks or teeth can be irritants and very hard to get off of clothing, such as wool or cotton. It was the inspiration for Velcro
Velcro is the brand name of the first commercially marketed fabric hook-and-loop fastener, invented in 1948 by the Swiss electrical engineer George de Mestral...
Plants with burs are found in many genera:
Acaena is a genus of about one hundred species of perennial herbs and subshrubs in the Rosaceae, native mainly to the Southern Hemisphere, notably New Zealand, Australia and South America, but with a few species extending into the Northern Hemisphere, north to Hawaii and California Acaena is a...
- Agrimonia - Agrimony
Ragweeds are flowering plants in the genus Ambrosia in the sunflower family Asteraceae. Common names include bitterweeds and bloodweeds....
- Arctium - Burdock
Bidens is a genus of flowering plants in the family Asteraceae. It contains about 200 species. The common names beggarticks, black jack, bur-marigolds, stickseeds, tickseeds and tickseed sunflowers refer to the achene burrs on the seeds of this genus, most of which are barbed...
- Bur marigold
The genus Circaea contains 7-10 species of flowering plants, known as Enchanter's nightshade. They are woodland plants occurring throughout the temperate regions of the Northern Hemisphere. Two species are widespread, Broad-leaved Enchanter's Nightshade and Alpine Enchanter's Nightshade...
- Enchanter's Nightshades
- Galium aparine
Galium aparine is a herbaceous annual plant of the family Rubiaceae. It is native to North America and Eurasia. It has several common names, including Cleavers, Clivers, Goosegrass, Stickywilly, Stickyjack, Stickyweed, Stickyleaf, Catchweed, Robin-run-the-hedge and Coachweed.-Growth:The long stems...
Geum , commonly called avens, is a genus of about 50 species of perennial herbaceous plants in the rose family Rosaceae, native to Europe, Asia, North and South America, Africa and New Zealand...
Hackelia is a genus of plants in the Borage Family, Boraginaceae. They are found in North America and southeast Asia. Of the approximately 40 species described, 10 are endemic to California....
Osmorhiza is a genus of perennial herbs, known generally as Sweet Cicely or Sweetroot. Most species are native to North America, but some grow in South America and Asia. Some species are used for medicinal purposes, but have dangerous lookalikes. The seeds of this plant have barbs on the end...