definição e significado de bur

Definição

bur (n.)

1.any of several erect biennial herbs of temperate Eurasia having stout taproots and producing burs

2.small bit used in dentistry or surgery

3.seed vessel having hooks or prickles

bur (v.)

1.remove the burrs from

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Dicionario analógico

Wikipedia - ver também

Wikipedia

Bur

For other uses, see BUR (disambiguation) and Burr (disambiguation).

Burs as seen in the UK.

Burs in rural Indiana

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.

The stems of plants that have burs differ based on where and how they grow. Those that grow in dense groups are single stemmed. while plants that are more isolated have branched stems. ^[1]

Function

Burs serve the plants that bear them in two main ways. Firstly they tend to repel some herbivores, much as other spines and prickles do. Secondly, they are important examples of seed dispersal by zoochory and anthropochory. Burs have hook-like structures that attach the seed or fruiting body to clothing, hair, and in particular, wool, or occasionally feathers. Such plants rely largely on living agents to disperse their seeds.^[2]