Yaupon \Yau"pon\, n. (Bot.) A shrub (Ilex Cassine) of the Holly family, native from Virginia to Florida. The smooth elliptical leaves are used as a substitute for tea, and were formerly used in preparing the black drink of the Indians of North Carolina. Called also South-Sea tea. [Written also yapon, youpon, and yupon.]

Source: Webster's Revised Unabridged Dictionary (1913)