Rugose

from WordNet (r) 3.0 (2006)

rugose
    adj 1: of leaves; ridged or wrinkled

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]