@sedgesrock has some recommendations here: https://www.inaturalist.org/posts/63486-identifer-profile-sedgesrock
Photos should include, if possible:
- Habitat (wetland, streamside, among rocks etc.)
- Longevity & habit: show base of plant & its neighbours (indicating whether annual or perennial; a tussock or rhizomatous etc.)
- Leaves & stem (leaf shape, hairiness, arrangement; stem scapose or nodose)
- Mature inflorescence appearance (bracts, overall shape i.e. umbellate, paniculate, compact head etc.)
- Close-up of individual inflorescence units (spikelet, head etc.)
- Close-up of glumes
- Close-up of fruit (if at all possible)