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Sidalcea malviflora

(DC.) Gray ex Benth.

California checkerbloom

G4Apparently Secure (G4G5) Found in 5 roadless areas NatureServe Explorer →
G4Apparently SecureGlobal Rank
Medium - lowThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.1256740
Element CodePDMAL110V0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicoccurs (regularly, as a native taxon) in multiple nations
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderMalvales
FamilyMalvaceae
GenusSidalcea
Concept Reference
Flora of North America Editorial Committee (FNA). 2015. Flora of North America north of Mexico. Vol. 6. Magnoliophyta: Cucurbitaceae to Droserceae. Oxford University Press, New York. 496 pp + xxiv.
Taxonomic Comments
This treatment of Sidalcea malviflora follows Hill's treatment in FNA (2015) which excludes S. asprella and S. asprella ssp. nana, S. celata, S. elegans, S. sparsifolia, and S. virgata. Previous treatments included those as subspecies of S. malviflora. This treatment includes as subspecies: ssp. californica, ssp. dolosa, ssp. laciniata, ssp. malviflora, ssp. patula, ssp. purpurea, and ssp. rostrata.
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2023-08-07
Change Date2023-08-07
Edition Date2023-08-07
Edition AuthorsNordman, C. (2023).
Threat ImpactMedium - low
Range Extent200,000-2,500,000 square km (about 80,000-1,000,000 square miles)
Number of Occurrences> 300
Range Extent Comments
Sidalcea malviflora occurs in the western United States, along the Pacific Coast, and Coast Range from Oregon, to California, and Baja California, Mexico. Range extent was estimated to be 480,000 square kilometers, using herbarium specimens and photo-based observations documented between 1992 and 2023 (CCH2 Portal 2023, Flora of North America Editorial Committee 2015, GBIF 2023, iNaturalist 2023, Villaseñor 2016).
Occurrences Comments
By applying a 1 km separation distance to herbarium records and photo-based observations documented between 1992 and 2023, it is estimated that there are about 1500 occurrences rangewide (CCH2 Portal 2023, GBIF 2023, iNaturalist 2023).
Threat Impact Comments
Threats include loss of habitat due to development, and competition from invasive exotic plants.
Ecology & Habitat

Habitat

Occurs in grasslands, oak woodlands, oak savanna, conifer woodlands, coastal sage scrub and chaparral, at elevations from near sea level to 2600 meters (CCH2 Portal 2023).
Terrestrial Habitats
Woodland - HardwoodWoodland - ConiferWoodland - MixedShrubland/chaparralSavannaGrassland/herbaceous
Other Nations (1)
United StatesN4
ProvinceRankNative
CaliforniaSNRYes
OregonSNRYes
Threat Assessments
ThreatScopeSeverityTiming
1 - Residential & commercial developmentRestricted (11-30%)Serious - moderateHigh (continuing)
1.1 - Housing & urban areasRestricted (11-30%)Serious - moderateHigh (continuing)
8 - Invasive & other problematic species, genes & diseasesRestricted (11-30%)Moderate or 11-30% pop. decline—
8.1 - Invasive non-native/alien species/diseasesRestricted (11-30%)Moderate or 11-30% pop. decline—

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Plant Characteristics
DurationPERENNIAL
Economic Value (Genus)No
Roadless Areas (5)
California (5)
AreaForestAcres
Bear MountainLos Padres National Forest913
KangarooKlamath National Forest40,617
Santa CruzLos Padres National Forest21,182
SugarloafSan Bernardino National Forest8,206
TrabucoCleveland National Forest23,341
References (6)
  1. CCH2 Portal. 2023. Consortium of California Herbaria. Online. Available: https//:www.cch2.org/portal/index.php (accessed 2023).
  2. Flora of North America Editorial Committee (FNA). 2015. Flora of North America north of Mexico. Vol. 6. Magnoliophyta: Cucurbitaceae to Droserceae. Oxford University Press, New York. 496 pp + xxiv.
  3. Global Biodiversity Information Facility (GBIF). 2023. Global Biodiversity Information Facility (GBIF) data portal. Online. Available: https://www.gbif.org/ (accessed 2023).
  4. iNaturalist. 2023. Online. Available: https://www.inaturalist.org (accessed 2023).
  5. 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.
  6. Villaseñor, J.L. 2016. Checklist of the native vascular plants of Mexico. Revista Mexicana de Biodiversidad 87: 559-902.