Taxon Report

Brodiaea santarosae T. Chester, W. Armstrong & K. Madore

Santa Rosa Basalt brodiaea

Print Report


© 2021 W. Juergen Schrenk

  Classification
Scientific Name:
 Brodiaea santarosae T. Chester, W. Armstrong & K. Madore
Common Name:
 Santa Rosa Basalt brodiaea
Family: Themidaceae
Element Code: PMLIL0C0G0
USDA Plants Symbol: BRSA
Synonyms/Other Names:

Ecology and Life History
Lifeform: perennial bulbiferous herb
Blooming Period: May-Jun May-Jun
Elevation: 565-1045 (1855-3430)
General Habitats: Valley and foothill grassland
Microhabitat:
Microhabitat Details: basaltic

Conservation Status
CA Rare Plant Rank: 1B.2
Global Rank: G1
State Rank:
 S1
State List: None
Fed List: None
Other Status: USFS_S
CRPR Changes:
  • changed from 3 to 1B.2 on 2013-09-17
  • added to 3 on 2008-02-14

Occurrence Data from the CNDDB
Total Occurrences: 12
Element Occurrence Ranks:
   Excellent (A) 2
   Good (B) 1
   Fair (C) 1
   Poor (D) 0
   None (X) 0
   Unknown (U) 8

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Riverside (RIV), San Diego (SDG)
Quads: Name (Quad Code)
Fallbrook (3311743), Margarita Peak (3311744), Murrieta (3311752), Sitton Peak (3311754), Wildomar (3311753)

Threat List Data from the CNDDB

Threat List Total: 7
EOs with Threat Listed: Total EOs % of EOs
5 42 %
Development 3 25%
Grazing 2 16%
Road/trail construction/maint. 2 16%
Surface water diversion 1 8%
Mining 1 8%
Non-native plant impacts 1 8%
ORV activity 1 8%

Notes
Previously CRPR 3; plants were known as possible hybrids between B. filifolia and B. orcuttii, but are now recognized as distinct. Research into the evolutionary origin of B. santarosae is currently underway. Possibly threatened by development. Forms sterile hybrids with B. terrestris ssp. kernensis. Not in TJM (1993). See Madroño 54(2):187-198 (2007) for original description.
Threats:
Taxonomy:

Selected References

Proposed Change from CRPR 3, G1Q / S1.3 to 1B.2, G2 / S2 (2013)
Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 7 January 2025].