I'm an amateur naturalist, always learning. "Each one of us adds a little to our understanding of Nature, and from all the facts assembled arises a certain grandeur." - Aristotle as quoted by Bradford Washburn.
My main area of exploration is the Pacific Northwest area of North America. I also like exploring the Southwest and have been able to explore a bit of Australia and New Zealand.
Some references I use for Pacific Northwest
Cascade-Olympic Natural History : A Trailside Reference by Daniel Mathews (a favorite)
Plants of the Pacific Northwest Coast: Washington,Oregon,British Columbia,and Alaska by Pojar and MacKinnon
Wildflowers of the Pacific Northwest by Mark Turner and Phyllis Gustafson and I find that Mark's website is very useful Pacific Northwest Wildflowers (Mark Turner) to search within a genus.