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1. US Fish and Wildlife Service (58 Federal Register 51147, 1993)

   E -- Endangered: taxa formally listed as endangered.
   T -- Threatened: taxa formally listed as threatened.
   P -- Proposed E or T: taxa formally proposed for listing as endangered or threatened.
   C1 -- Notice of Review, Category 1: taxa for which substantial biological information exists on file to support proposing to list as endangered or threatened.
   C2 -- Notice of Review, Category 2: taxa for which current information indicates that proposing to list as endangered or threatened is possible, but appropriate or substantial biological information is not on file to support an immediate rulemaking.
   3A -- Taxa for which the USFWS has persuasive evidence of extinction.
   3B -- Names that based on current taxonomic knowledge do not represent taxa meeting the Endangered Species Act's definition of a species.
   3C -- Notice of Review, Category 3C: taxa that have proven to be more abundant or widespread than was previously believed, and/or those that are not subject to any identifiable threat.

2. US Forest Service (Forest Service Manual 2670.5)

   S: -- Sensitive: those plant and animal species identified by the< Regional Forester for which population viability is a concern as evidenced by:

   1. Significant current or predicted downward trends in population numbers or density.
      
   2. Significant current or predicted downward trends in habitat capability that would reduce a species' existing distribution.

3. Bureau of Land Management (BLM Manual 6840.06D)

   S: -- Sensitive: those species found on public lands, designated by a State Director, that could easily become endangered or extinct in a State. The protection provided for sensitive species is the same as that provided for C1 and C2 candidate species.

GLOBAL RANK (G): based on range-wide status of a species.

G1 -- Critically imperiled globally because of extreme rarity (5 or fewer occurrences, or very few remaining individuals), or because of some factor of its biology making it especially vulnerable to extinction. (Critically endangered throughout its range).
G2 -- Imperiled globally because of rarity (6 to 20 occurrences) or because of other factors demonstrably making it very vulnerable to extinction throughout its range. (Endangered throughout its range).
G3 -- Very rare or local throughout its range or found locally in a restricted range (21 to 100 occurrences). (Threatened throughout its range).
G4 -- Apparently secure globally, though it might be quite rare in parts of its range. especially at the periphery.
G5 -- Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.
GQ -- Indicates uncertainty about taxonomic status.
G? -- Indicates uncertainty about an assigned global rank.

STATE RANK (S): based on the status of a species in an individual state ranks may differ between Wyoming and neighboring states based on the relative abundance of a species in each state.

S1 -- Critically imperiled in state because of extreme rarity (5 or fewer occurrences, or very few remaining individuals), or because of some factor of its biology making it especially vulnerable to extirpation from the state. (Critically endangered in state).
S2 -- Imperiled in state because of rarity (6 to 20 occurrences) or because of other factors demonstrably making it very vulnerable to extirpation from the state (Endangered or threatened in state).
S3 -- Rare in state (21 to 100 occurrences).
S? -- Indicates uncertainty about an assigned state rank.
SH -- Of historical occurrence, not documented in Wyoming since 1920.