The Collaborative International Dictionary of English v.0.48:

Herborize \Her"bo*rize\, v. i. [imp. & p. p. Herborized; p.
   pr. & vb. n. Herborizing.] [F. herboriser, for herbariser,
   fr. L. herbarium. See Hebrarium.]
   To search for plants, or new species of plants, with a view
   to classifying them.
   [1913 Webster]

         He herborized as he traveled.            --W. Tooke.
   [1913 Webster]