An anatomical entity that is or was part of a plant.

Includes both material entities such as plant structures and immaterial entities such as plant anatomical spaces. CARO:0000000 'anatomical entity' is defined as: A part of a cellular organism that is either an immaterial entity or a material entity with granularity aboove the level of a protein complex. Or, a substance produced by a cellular organism with granularity above the level of a protein complex. Refers to BFO:0000004 'independent continuant'.