Order XIX. Dioscoreaceae, Lindl.—Yams.
2. Leaves with netted (reticulated) veins. Dictyogens; Retosa. Lindley.
Flowers unisexual, with the perianth adherent to the ovary (inferior ovary).
Dioscoreae, R. Brown.
Characters.—Twining endogenous plants with reticulated leaves, unisexual regular flowers, a 6-parted superior perianth, 6 stamens, a 3 celled inferior ovary with 1- or 2-sceded cells, and capsular or berried fruit.
The Elements of Materia Medica and Therapeutics, Vol. II, 3th American ed., was written by Jonathan Pereira in 1853.