# Burr

**Source**: https://eflora.sydney.edu.au/glossary/burr
**Parent**: https://eflora.sydney.edu.au/glossary/

a rough or prickly compound structure developed from a [seed](https://eflora.sydney.edu.au/glossary/seed "the fertilized ovule of a plant, containing an embryo, and sometimes endosperm, which are covered by the seed coat.") or [fruit](https://eflora.sydney.edu.au/glossary/fruit "the seed bearing structure developed from the ovary of Magnoliopsida (Angiosperms) after fertilization.") and associated appendages (bracts, [perianth](https://eflora.sydney.edu.au/glossary/perianth "the calyx and corolla collectively, especially when they are morphologically similar."), etc.).

- [Burr](https://eflora.sydney.edu.au/glossary/image/burr "Longitudinal section through an almost mature burr of the species Xanthium spinosum showing 2 young fruits.")