Taxon Summary

Streptanthus albidus ssp. peramoenus, commonly known as most beautiful jewelflower, is a annual herb in the Brassicaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, and Valley and foothill grassland, growing at elevations from 95 to 1000 meters. Streptanthus albidus ssp. peramoenus is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Streptanthus albidus Greene ssp. peramoenus (Greene) Kruckeberg
Common Name:	most beautiful jewelflower
Family:	Brassicaceae
Element Code:	PDBRA2G012
USDA Plants Symbol:	STALP
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: (Mar)Apr-Sep(Oct)	(Mar)Apr-Sep(Oct)
Elevation:	95-1000 (310-3280)
General Habitats:	Chaparral, Cismontane woodland, Valley and foothill grassland
Microhabitat:	Serpentine
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G2T2
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_CalBG/RSABG; SB_UCBG; USFS_S
CRPR Changes:	changed from 1B.2 to 1B.2 on 2012-05-09

Occurrence Data from the CNDDB


Total Occurrences:	103
Element Occurrence Ranks:
Excellent (A)	11
Good (B)	37
Fair (C)	6
Poor (D)	3
None (X)	0
Unknown (U)	46

Location


California Endemic: True
California Counties and Islands: Name (Code)
Alameda (ALA), Contra Costa (CCA), Monterey (MNT), San Luis Obispo (SLO), Santa Clara (SCL)
Quads: Name (Quad Code)
Alder Peak (3512183), Atascadero (3512046), Burnett Peak (3512172), Burro Mountain (3512173), Calaveras Reservoir (3712147), Cambria (3512151)?, Cape San Martin (3512184), Chittenden (3612185), Clayton (3712188), Cone Peak (3612114), Cypress Mountain (3512058)?, Gilroy (3712115), Hayward (3712261), La Costa Valley (3712157), Las Trampas Ridge (3712271), Lopez Mtn. (3512035), Lopez Point (3612115), Los Gatos (3712128), Morgan Hill (3712126), Morro Bay North (3512047), Morro Bay South (3512037)?, Mt. Madonna (3712116), Mt. Sizer (3712125), Niles (3712158), Oakland East (3712272), Pebblestone Shut-in (3512161), Piedras Blancas (3512163)?, Port San Luis (3512027), San Leandro (3712262), San Luis Obispo (3512036), San Simeon (3512162), Santa Margarita Lake (3512034), Santa Teresa Hills (3712127)

Threat List Data from the CNDDB


Threat List Total:	18
EOs with Threat Listed:	Total EOs	% of EOs
	53	51 %
Non-native plant impacts	27	26%
Grazing	14	13%
Development	13	12%
Road/trail construction/maint.	12	11%
Foot traffic/trampling	6	5%
Recreational use (non-ORV)	5	4%
Erosion/runoff	5	4%
Feral pigs	4	3%
Improper burning regime	4	3%
Other	3	2%
Military operations	2	1%
Mining	1	0%
Insufficient population/stand size	1	0%
Landfill	1	0%
Over-collecting/poaching	1	0%
ORV activity	1	0%
Vandalism/dumping/litter	1	0%
Waterway bank protection/maintenance	1	0%

Notes



Historical occurrences need field surveys. Threatened by development, non-native plants, and grazing. Possibly threatened by dam maintenance, road construction and maintenance, and recreational activities. Similar plants from MNT and SLO counties may be S. glandulosus ssp. glandulosus; see this name in TJM 2; further study is underway to determine its relationship to the S. glandulosus complex. See Bulletin of the Torrey Botanical Club 13(1):142 (1886) for original description, and Madroño 14(7):217-227 (1958) for taxonomic treatment.
Threats:

Taxonomy:

Selected References

CRPR List Change on 2012-05-09

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 23 February 2025].

Taxon Report

Streptanthus albidus Greene ssp. peramoenus (Greene) Kruckeberg

most beautiful jewelflower