California Native Plant Society

Rare Plant Program

Numerical Analysis of this and Previous Editions

(from CNPS Inventory, 6th Edition, 2001)

As the following numerical comparison of the plants in the six Inventory editions demonstrates, the size of California's rare and endangered flora continues to grow (Table 1). The percentages given below indicate the portion of the total native flora in California represented by the plants on a particular list for the different editions. We estimate that the flora as currently described contains 6300 native species, subspecies, and varieties. This is the number of native taxa that are fully described in The Jepson Manual (about 6000), plus the approximate number that receive peripheral mention as minor taxa.

Table 1. Numerical comparison of the SIX CNPS Inventory editions. We have reevaluated percent of flora for past editions based on 6300 native plants in California.

List or Appendix Taxa % Flora
1974, 1st Edition
1. Very Rare & Rare and Endangered 704 11.1%
Appendix I-- Rare and Not Endangered 554 8.8%
Appendix II-- Mostly of Limited Distribution 135 2.1%
TOTAL 1393 22.0%
1980, 2nd Edition
1. Presumed Extinct in California 44 0.7%
2. Rare and Endangered 656 10.4%
3. Rare, But Not Endangered 446 7.1%
4. Rare in California, But Not Elsewhere 237 3.8%
TOTAL 1383 22.0%
1984, 3rd Edition
1A. Presumed Extinct in California 34 0.5%
1B. Rare or Endangered in California and Elsewhere 604 9.6%
2. R/E in California, More Common Elsewhere 198 3.1%
3. Need More Information 114 1.8%
4. Plants of Limited Distribution 449 7.1%
TOTAL 1399 22.2%
1988, 4th Edition
1A. Presumed Extinct in California 39 0.6%
1B. Rare or Endangered in California and Elsewhere 675 10.7%
2. R/E in California, More Common Elsewhere 177 2.8%
3. Need More Information 149 2.4%
4. Plants of Limited Distribution 508 8.1%
TOTAL 1548 24.6%
1994, 5th Edition (current)
1A. Presumed Extinct in California 34 0.5%
1B. Rare or Endangered in California and Elsewhere 857 13.6%
2. R/E in California, More Common Elsewhere 272 4.3%
3. Need More Information 47 0.8%
4. Plants of Limited Distribution 532 8.4%
TOTAL 1742 27.6%
2001, 6th Edition (current)
1A. Presumed Extinct in California

29

0.4%

1B. Rare or Endangered in California and Elsewhere

1021

16.2%

2. R/E in California, More Common Elsewhere

417

6.6%

3. Need More Information

52

0.8%

4. Plants of Limited Distribution 554 8.8%
TOTAL 2073 32.9%

 

Copyright © 1999-2017 California Native Plant Society. All rights reserved. Contact Us | Privacy