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In biology, an indumentum (Latin, literally: "garment") is a covering of trichomes (fine "hairs") on a plant^[1] or of bristles (rarely scales) of an insect.

Indumentum of Echium vulgare

Caducous hairs on a developing pitcher of Nepenthes chaniana

Rust-colored indumentum on the underside of a leaf of the bog Labrador tea (Rhododendron groenlandicum)

^ Davis, Peter Hadland; Heywood, Vernon Hilton (1963). Principles of Angiosperm Taxonomy. Princeton, New Jersey: Van Nostrand. p. 154. OCLC 552236.