2021 Washingston Vascular Plant Species Review Lists 1 & 2

Washington Natural Heritage Progam

Since 1977, the Washington Natural Heritage Program (WNHP) has maintained a list of Washington vascular plant species of conservation concern. Before being added to this list, species undergo a review in which their status is evaluated by the state natural heritage program botanist and experts from academia, government, and the private sector. During the review, species are assessed based on the best available information on their distribution, abundance, number of occurrences, threats, and trends in the state. If a species is found to be sufficiently vulnerable, it is designated as state Endangered, Threatened, Sensitive, or Extirpated and added to the Washington Vascular Plant Species of Conservation Concern list (Fertig 2021a). Species determined to be sufficiently widespread, abundant, or unthreatened may be dropped. WNHP maintains two review lists based on the state of taxonomic knowledge: well-accepted species, subspecies, or varieties are included in Review List 1, while those with unresolved taxonomic questions are in Review List 2. The review lists are periodically updated as new information becomes available or the status of species is revised. The following is an update of the July 2019 list (WNHP 2019). Twelve species have been added and 21 removed from the last edition of the WNHP review lists. New species are indicated by a * preceding the species name. Status changes are underlined for new data or crossed through for newly recognized errors or deletions