Source : Webster's Revised Unabridged Dictionary (1913)

Rugose \Ru*gose"\, a. [L. rugosus, r. ruga a wrinkle.]
   Wrinkled; full of wrinkles; specifically (Bot.), having the
   veinlets sunken and the spaces between them elevated, as the
   leaves of the sage and horehound.

Source : WordNet®

rugose
     adj : of leaves; ridged or wrinkled