Pith, a central tissue in vascular plants, comprises spongy parenchyma cells that store starch and aid in nutrient movement. Located in stems and roots, it is surrounded by xylem and phloem, often darkening over time. Authors such as Robert Hooke described its structure in Micrographia, while Ada Barnett employed "Pithey" as a term in literature, and Robert Ridgway mentioned it in ornithology.
The term also appears in non-botanical settings, such as citrus peels or historical tools. This versatile concept connects plant biology, classification, and cultural use, highlighting its lasting significance across various fields.