These are images from the southernmost ravine on the upstream end of University Lake. This ravine has the largest and purest population of twinleaf (Jeffersonia diphylla) I've ever seen.

A deer-trail running through nearly-pure Jeffersonia diphylla, 4/19/04.

Jeffersonia diphylla in flower near dusk, 4/3/04.

A small island of goldenseal (Hydrastis canadensis) in the sea of twinleaf, 4/19/04.