I'm now recording the Family-Subfamily-Tribe of plants in big families in the Evernote entries about my observations. After taking the Asteraceae class - daisies and dandelions and sunflowers - i knew being able to key out a new plant by recognizing the tribe would be helpful. Beans, mints, and the apple family are also so large and varied that i am finding it useful to subdivide there, as well.
This is also posted at http://elainegrey.dreamwidth.org/647562.html .