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Sairocarpus multiflorus

D.A. Sutton

Withered Snapdragon

G5Secure Found in 39 roadless areas NatureServe Explorer →
G5SecureGlobal Rank
UnknownThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.133523
Element CodePDSCR2S050
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single state or province
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderPlantaginales
FamilyPlantaginaceae
GenusSairocarpus
Synonyms
Antirrhinum thompsoniiD.J. Keil
Other Common Names
Sierra Snapdragon (EN) Sierra snapdragon (EN)
Concept Reference
Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Taxonomic Comments
Barringer in FNA (2019) accepts the name Sairocarpus multiflorus D.A. Sutton for this species, listing Antirrhinum thompsonii D.J. Keil as a synonym. Keil et al. (2020) recognize the species as a member of the genus Antirrhinum, using the name Antirrhinum thompsonii D. J. Keil. Correpsondence in Rosatti (2026) indicates that Antirrhinum thompsonii D.J. Keil replaces Antirrhinum multiflorum Pennell, an illegitimate name, being a later homonym of A. x multiflora Vick (1868).
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2026-04-16
Change Date2026-04-16
Edition Date2026-04-16
Edition AuthorsSoteropoulos (2026)
Threat ImpactUnknown
Range Extent20,000-200,000 square km (about 8000-80,000 square miles)
Number of Occurrences> 300
Rank Reasons
Sairocarpus multiflorus is a wide-ranging annual herb found in rocky, disturbed, or burned areas. It endemic to the western United States, primarily in western California from the southern San Francisco Bay Area south to the San Jacinto Mountains, with a disjunct population in the northern Sierra Nevada Foothills. There are over 400 occurrences. Little is known about threats or trends, but with a large range extent and large number of occurrences, this species is considered secure.
Range Extent Comments
Sairocarpus multiflorus is endemic to the western United States, primarily in western California from the southern San Francisco Bay Area south to the San Jacinto Mountains, with a disjunct population in the northern Sierra Nevada Foothills (FNA 2019, Jepson Flora Project 2026). Range extent was estimated to be over 100,000 square kilometers using herbarium specimens and photo-based observations documented between 1994 and 2025 (RARECAT 2025, GBIF 2026, iNaturalist 2026, SEINet 2026).
Occurrences Comments
By applying a 1 km separation distance to herbarium specimens and photo-based observations documented between 1994 and 2025, it is estimated that there are over 400 occurrences rangewide (RARECAT 2025, GBIF 2026, iNaturalist 2026, SEINet 2026).
Threat Impact Comments
Threats are unknown.
Ecology & Habitat

Habitat

Sairocarpus multiflorus grows in rocky, disturbed, or burned areas (FNA 2019, Jepson Flora Project 2026).

Reproduction

This taxon flowers from April to August, and occasionally in October and November (FNA 2019, Jepson Flora Project 2026).
Terrestrial Habitats
Bare rock/talus/scree
Other Nations (1)
United StatesN5
ProvinceRankNative
CaliforniaSNRYes
Threat Assessments
ThreatScopeSeverityTiming
Unknown/undetermined———

—

Plant Characteristics
DurationANNUAL, PERENNIAL
Economic Value (Genus)No
Roadless Areas (39)
California (39)
AreaForestAcres
Arroyo SecoAngeles National Forest4,703
Bear MountainLos Padres National Forest913
Big RocksLos Padres National Forest11,866
Black ButteLos Padres National Forest5,116
Black MountainLos Padres National Forest16,818
CamuesaLos Padres National Forest8,209
Chalk PeakLos Padres National Forest7,472
Circle MountainSan Bernardino National Forest6,375
Crystal CreekSan Bernardino National Forest6,783
Cucamonga AAngeles National Forest1,249
Cucamonga BSan Bernardino National Forest11,933
Cucamonga CSan Bernardino National Forest4,106
De La GuerraLos Padres National Forest5,418
Dry LakesLos Padres National Forest17,043
Fish CanyonAngeles National Forest29,886
JuncalLos Padres National Forest12,289
Little PineLos Padres National Forest1,315
Los Machos HillsLos Padres National Forest11,112
Machesna MountainLos Padres National Forest12,271
Magic MountainAngeles National Forest15,542
Malduce BuckhornLos Padres National Forest14,177
MatilijaLos Padres National Forest5,218
Mill PeakSan Bernardino National Forest7,884
MonoLos Padres National Forest28,141
NordhoffLos Padres National Forest12,031
Red MountainAngeles National Forest8,034
San DimasAngeles National Forest7,160
San Gabriel AddAngeles National Forest2,527
Santa CruzLos Padres National Forest21,182
Sespe - FrazierAngeles National Forest4,254
Sespe - FrazierLos Padres National Forest106,910
Sheep MountainAngeles National Forest21,098
Stanley MountainLos Padres National Forest14,674
Strawberry PeakAngeles National Forest7,245
TequepisLos Padres National Forest9,080
TuleAngeles National Forest9,861
West ForkAngeles National Forest1,169
WestforkAngeles National Forest4,407
White LedgeLos Padres National Forest18,632
References (5)
  1. Flora of North America Editorial Committee (FNA). 2019. Flora of North America north of Mexico. Vol. 17: Magnoliophyta: Tetrachondraceae to Orobanchaceae. Oxford Univ. Press, New York. xxiv + 737 pp.
  2. Jepson Flora Project (eds.) 2026. Jepson eFlora. Online. Available: https://ucjeps.berkeley.edu/eflora/ (accessed 2026).
  3. Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
  4. Keil, D.J., M. Wetherwax and D.M. Thompson. 2020. <i>Antirrhinum</i> in Jepson Flora Project (eds.) Jepson eFlora, Revision 8, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=9184.
  5. Rosatti, T.J. ed. 2025. Index to California Plant Names. The University and Jepson Herbaria, University of California, Berkley. Accessed 2026.