ilex cassine

from The Collaborative International Dictionary of English v.0.48

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}.]
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Dahoon \Da*hoon"\ (d[.a]*h[=oo]n"), [Origin unknown.]
   An evergreen shrub or small tree ({Ilex cassine}) of the
   southern United States, bearing red drupes and having soft,
   white, close-grained wood; -- called also {dahoon holly}.
   [Webster 1913 Suppl.]