S. Boyd & T.S. Ross
Identity
Unique IDELEMENT_GLOBAL.2.157511
Element CodePDBRA32010
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single state or province
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderCapparales
FamilyBrassicaceae
GenusSibaropsis
Concept ReferenceKartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.
Taxonomic CommentsA newly described species in a newly described monotypic genus (Boyd & Ross, 1997); Kartesz (1999) accepts.
Conservation Status
Rank MethodLegacy Rank calculation - Excel v3.1x
Review Date2016-06-15
Change Date2001-05-10
Edition Date2016-06-15
Edition AuthorsThunhorst, G.(1997), rev. Bittman and Treher (2016)
Threat ImpactHigh
Range Extent250-1000 square km (about 100-400 square miles)
Number of Occurrences1 - 5
Rank ReasonsKnown from only three mountains in the Peninsular Ranges of Southern California with narrow habitat requirements. Most sites have low population numbers. Further survey is likely to reveal more populations. Potentially threatened by invasive, non-native weeds, grazing, trampling, and off-road vehicle use. Almost all occurrences are in Cleveland National Forest.
Range Extent CommentsKnown only from Elsinore Peak in the Santa Ana Mountains in southwestern Riverside County, California and from Poser and Viejas mountains in the southern portion of the Cuyamaca Range of San Diego County, California (a disjunction of approximately 120 km between northern and southern populations). Based on the few populations known, one might surmise that the species is restricted to the Peninsular Ranges of austral California (Boyd and Ross 1997).
Occurrences CommentsThe taxon is currently known from three mountains, but since the Peninsular Ranges contain outcrops with potential habitat, in all likelihood, future, appropriately-timed surveys of these habitats will reveal the presence of additional populations (Boyd and Ross 1997).
Threat Impact CommentsTwo of the sites report grazing. Both population centers occur near the edge of the National Forest, adjacent to areas undergoing rapid urbanization. External, anthropogenically mediated threats are to be expected and may prove the most intractable management problem. In particular, increased fire frequency (as well as post-fire seeding of invasive non-native species), trampling, habitat damage by off-road vehicles (a particular concern at Elsinore Peak), and the concomitant invasion of the clay soil habitat by aggressive alien weeds, could each have serious negative effects (Boyd and Ross 1997).