(perhaps) a vegetable yielding oil, or eaten with oil.

A plant from which indigo is obtained, indigo-plant, n., including several species of Indigofera.

Any of various plants yielding an oil; spec. (a) sesame, Sesamum indicum; (b) bok choy, Brassica chinensis; (c) regional (Irish English), sundew…

A plant yielding indigo; spec. a plant of the genus Indigofera: cf. indigo, n. 2.

any plant from which fibre for thread-making is obtained (Ogilvie, 1882).

any plant that produces a fibre of commercial value.