The Collaborative International Dictionary of English v.0.48:

Tidytips \Ti"dy*tips`\, n. (Bot.)
   A California composite plant (Layia platyglossa), the
   flower of which has yellow rays tipped with white.
   [1913 Webster]

WordNet (r) 3.0 (2006):

tidytips
    n 1: California annual having flower heads with yellow rays
         tipped with white [syn: tidytips, tidy tips, Layia
         platyglossa]