Where Do Burrs Come from?
A Bur (Also Spelled Burr) Is a Seed or Dry Fruit or Infructescence That Has Hooks or Teeth. Some Other Forms of Diaspores, Such as the Stems of Certain Species...
A bur (also spelled burr) is a seed or dry fruit or infructescence that has hooks or teeth. Some other forms of diaspores, such as the stems of certain species of cactus also are covered with thorns and may function as burs.
What plant causes burrs?
Cocklebur plants (Xanthium strumarium) produce hundreds of little football-shaped burs, about one inch (2.5 cm) long and covered with stiff, hooked spines. [Another species that is less common but widespread across North America is called spiny cocklebur (X. spinosum).
Where do burr plants grow?
Annual sandbur plants (Cenchrus spp.) thrive in warm, sandy soils across much of the United States. These grow up to 20 inches in height and feature leaf blades with downy surfaces and smooth undersides. Their round, 2 1/2-inch burrs occur in vertical clusters, and have skin-piercing hooks.
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