Bicostate :: Bicostate (a.) Having two principal ribs running longitudinally, as a leaf..
Costated :: Costated (a.) Having ribs, or the appearance of ribs; (Bot.) having one or more longitudinal ribs..
Ecostate :: Ecostate (a.) Having no ribs or nerves; -- said of a leaf.
Multicostate :: Multicostate (a.) Having numerous ribs, or costae, as the leaf of a plant, or as certain shells and corals..
Tricostate :: Tricostate (a.) Three-ribbed; having three ribs from the base.
Unicostate :: Unicostate (a.) Having a single rib or strong nerve running upward from the base; -- said of a leaf.