What makes a Juncus identifiable can be some distinctive feature (like shape of buds - see your sighting of J prismatocrpus, arrangement of flowers, whether culm is noded, the plant has leaves), a whole lot of features that don't lend themselves to field photography. Familiarity with a species certainly plays a part (at least, for me) in ID from photographs. In this case, I don't know Juncus pheanthus (suggested by Tapirlord) so struggle to confirm without more info.
If you can, then its helpful if the photo shows close up of fruiting, capsules, and should aim to show whether tepals are similar in length, shorter than, or longer than, capsule (eyeball some of the Juncus sightings on CNM to get a feel for this). A comment on whether the pith is continuous or septate can also be helpful (slit the culm with knife or fingernail).
I've photographed J.phaeanthus a few times, always in montane or subalpine bogs. It is quite a tall rush with forest green culms and distinctively dark coloured globular infloresence. The infloresence of this specimen is still emerging so the suggestion is tentative. Absolutely agree with Jane that familiarly with the subject matter is very useful, Juncus are difficult to ID at the best of times. If you are going to take additional photographs it is also worth checking the base of the plant to document the colour of the basal sheaths.
Describe how you intend to use these images and/or audio files and your request will be sent to the author for consideration.
Your request has been successfully submitted to the author for consideration.
2,152,873 sightings of 19,936 species in 6,475 locations from 11,405 contributors
CCA 3.0 | privacy
We acknowledge the Traditional Owners of this land and acknowledge their continuing connection to their culture. We pay our respects to their Elders past and present.