I'm the same Marshman from the Wikipedia Project but presently not active.
Here at WikiBooks, I am interested in putting together a Study Guide on Botany and on on Ecology, by which I mean an outline of botanical or ecological subjects organized as they would be found in a textbook with links to appropriate Wikipedia articles (where I am working to instill botanical credibility). In time, text would need to be added to the Study Guide to introduce and transition between subjects. Eventually, this outline could be fleshed out into a textbook. Hopefully this approach will result in a useful product (although incomplete) much sooner than attempting to write a textbook from scratch.
I am a biologist with a background in marine biology, terrestrial botany, water quality, and ecology. I am still active in the work force as a biologist/consultant and own a 13-person consulting firm in Hawaii.