bur is a ball that is covered in spikes and used in seed dispersion im not sure if it is a fruit or not...
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A bur (also spelled burr) is a seed or dry fruit or infructescence 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. The burr of burdock was the inspiration for Velcro.
Unlike many other members of the family Asteraceae, whose seeds are airborne with a plume of silky hairs resembling miniature parachutes, cocklebur seeds are produced in a hard, spiny, globose or oval double-chambered, single-seeded bur .32-.79 in long. It is covered with stiff, hooked spines, which sticks to fur and clothing and can be quite difficult to extract. These remarkable burred seeds have allowed this plant to be carried all over the world by unsuspecting travelers. This plant reproduces only by means of its seed.
Kindly click on the links below to learn more ---
http://en.wikipedia.org/wiki/Bur
http://en.wikipedia.org/wiki/Burdock
http://en.wikipedia.org/wiki/Cocklebur#G…
Unlike many other members of the family Asteraceae, whose seeds are airborne with a plume of silky hairs resembling miniature parachutes, cocklebur seeds are produced in a hard, spiny, globose or oval double-chambered, single-seeded bur .32-.79 in long. It is covered with stiff, hooked spines, which sticks to fur and clothing and can be quite difficult to extract. These remarkable burred seeds have allowed this plant to be carried all over the world by unsuspecting travelers. This plant reproduces only by means of its seed.
Kindly click on the links below to learn more ---
http://en.wikipedia.org/wiki/Bur
http://en.wikipedia.org/wiki/Burdock
http://en.wikipedia.org/wiki/Cocklebur#G…