Reporting Noxious Weeds: There are ~50 known vascular plant species in the state that are considered noxious by the Utah Department of Agriculture. Reporting populations that are established or new occurrences is critical in removal of these species to prevent further destruction of the native biodiversity. By submitting observations directly to the Department of Agriculture through EDDmapS, observations are directly sent to the state weed management department! USU extension has also compiled a guide: Noxious Weed Field Guide for Utah.
Rare plant guides: In Utah, there are roughly 290 species of plants that are considered to be rare. Currently, there are two field guides relating specifically to rare plants of Utah. One done by the Utah Native Plant Society (found here) and another done by the Department of Natural Resources (found here).
Other Resources for Plant identification
Learn how to key plants with this Dichotomous key - how to guide or stop by during PIP! [ <-hyperlink to pip section located in services]
Miscellaneous treatments can be found in this Keybase along with FNA vol. 24 & 25
A short discussion of the rare ferns of Utah, with some Cystopteris and polyploidy information snuck in
