Lizzie Harper (#23) says a leaf's veins and shadow, plus the colours of a couple of flowers, are enough for her to rebuild a whole plant later, even out of bloom. Bauer (#12) went further: numbers for colours in the field, and a plate years afterward.
Both keep the field page small on purpose. What it records is what the later drawing cannot invent.
Try it: sit with one plant for twenty minutes and make a page that holds only what you could not reconstruct from memory. Leave it a week, then draw the whole plant from that page alone, and see what you wish you had written down.
By Raz Rotenberg, made with AI