Rare Plants of San Diego County

Appendix 1. Plant Sensitivity Guidelines

Listings by USFWS and CDFG carry regulatory authority, while other listings herein are generally advisory in nature and serve to monitor and inform.

Federally Listed and Candidate Species

FE Federal Endangered Species: Listed as Endangered by the federal government under the Endangered Species Act of 1973. Taxa that are in danger of becoming extinct throughout all or a significant portion of their range.
FT Federal Threatened Species: Listed as Threatened by the federal government under the Endangered Species Act of 1973. Taxa which are likely to become Endangered in the foreseeable future in the absence of special protection.
C1 Federal Candidate, Category 1:: Taxa for which the USFWS has sufficient biological information to support a proposal to list as endangered or threatened.
C2 Federal Candidate, Category 2:: Taxa for which existing information suggests listing may be warranted, but for which substantial biological information to support a proposed rule is lacking.
C3 Federal Candidate, Category 3:: Taxa that were once being considered for listing as Threatened or Endangered by the federal government but are not currently receiving such consideration.
C3a Federal Candidate, Category 3a:: Taxa which are believed extinct.
C3b Federal Candidate, Category 3b:: Taxa which do not meet the Endangered Species Act's definition of a species.
C3c Federal Candidate, Category 3c:: Taxa more common than previously thought, no longer being considered for listing at this time.
C1R "Recommended" for Category 1 status U.S. Fish and Wildlife Service: Taxa which currently have no official status under the Endangered Species Act but for which sufficient biological information exists to support listing as a Category 1 species.
C2R "Recommended" for Category 2 status U.S. Fish and Wildlife Service: Taxa which currently have no official status under the Endangered Species Act but for which sufficient biological information exists to support listing as a Category 2 species.

California Listed and Candidate Species

CE California Endangered Species

A native California taxa which is in serious danger of becoming extinct throughout all or a significant portion of its range (Fish & Game Code 2062).

CT California Threatened Species

A native California taxa which, although not presently threatened with extinction, is likely to become an endangered species in the foreseeable future in the absence of special protection and management efforts (Fish & Game Code 2067).

California Native Plant Society R-E-D Code

R (Rarity)

1 Rare, but found in sufficient numbers and distributed widely enough that the potential for extinction of extirpation is low at this time.
2 Occurrence confined to several populations or to one extended population.
3 Occurrence limited to one or a few highly restricted populations, or present in such small numbers that it is seldom reported.

E (Endangerment)

1 Not endangered.
2 Endangered in a portion of its range.
3 Endangered throughout its range.

D (Distribution)

1 More or less widespread outside of California.
2 Rare outside California.
3 Endemic to California.

List 1A: Plants presumed extinct in California.
List 1B: Plants rare, threatened or endangered in California and elsewhere.
List 2: Plants rare or endangered in California, but more common elsewhere.
List 3: Plants about which more information is needed.
List 4: Plants of limited distribution.

Global Ranking

Species or Natural Community Level

G1 = Less than 6 viable element occurrences (EO) OR less than 1000 individuals OR less than 2000 acres.
G2 = 6-20 EOs OR 1000-3000 individuals OR 2000-10000 acres.
G3 = 21-100 EOs OR 3000-10000 individuals OR 10000-50000 acres.
G4 = Apparently secure; this rank is clearly lower than G3 but factors exist to cause some concern (i.e., there is some threat, or somewhat narrow habitat).
G5 = Population or stand demonstrably secure to ineradicable due to being commonly found in the world

Subspecies Level

Subspecies receive a T-rank attached to the G-rank. With the subspecies, the G-rank reflects the condition of the entire species; whereas, the T-rank reflects the global situation of just the subspecies.

State Ranking

S1 = Less than 6 EOs OR less than 100 individuals OR less than 2000 acres
- S1.1 = very threatened
- S1.2 = threatened
- S1.3 = no current threats known
S2 = 6-20 EOs OR 1000-3000 individuals OR 2000-10000 acres
- S2.1 = very threatened
- S2.2 = threatened
- S2.3 = no current threats known
S3 = 21-100 EOs OR 3000-10000 individuals OR 10000-50000 acres
- S3.1 = very threatened
- S3.2 = threatened
- S3.3 = no current threats known
S4 = Apparently secure within California; this rank is clearly lower than S3 but factors exist to cause some concern (i.e., there is some threat, or somewhat narrow habitat. NO THREAT RANK.
S5 = Demonstrably secure to ineradicable in California. NO THREAT RANK.

NOTES:

1) Rank may be expressed as a range of values; hence S2S3 means the rank is somewhere between S2 and S3.
2) Adding ? to the rank, such as in S2?, represents more certainty than S2S3, but less than S2.
3) "GH" indicates that all sites are historical; the element has not been seen for at least 20 years but suitable habitat still exists.
4) "SH" indicates that all California sites are historical.
5) "GX" indicates that all sites are extirpated and this element is extinct in the wild.
6) "SX" indicates all California sites are extirpated.
7) "GXC" indicates this element is extinct in the wild but exists in cultivation.
8) "G1Q" indicates this element is very rare, but there is a taxonomic question associated with it.

Back to Craig H. Reiser's Rare Plants of San Diego County

appendix.html