Sidalcea stipularis - J.T. Howell & True
Scadden Flat Checkerbloom
Other Common Names: Scadden Flat checkerbloom
Taxonomic Status: Accepted
Related ITIS Name(s): Sidalcea stipularis J.T. Howell & True (TSN 505214)
Unique Identifier: ELEMENT_GLOBAL.2.152327
Element Code: PDMAL110R0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Mallow Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Malvales Malvaceae Sidalcea
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Concept Reference
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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.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Sidalcea stipularis
Conservation Status
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NatureServe Status

Global Status: G1
Global Status Last Reviewed: 23Feb2016
Global Status Last Changed: 26Jun1984
Rounded Global Status: G1 - Critically Imperiled
Reasons: Endemic to California, Sidalcea stipularis is known from only two occurrences in the Scadden Flat area near Grass Valley in Nevada County. Part of one of the occurrences is supposedly being voluntarily protected by the landowner. Altered hydrology, road maintenance, grazing, and non-native plants threaten this taxon. The large, well-known Caltrans site is threatened by road widening, invasive blackberries and potential catastrophic events.
Nation: United States
National Status: N1

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States California (S1)

Other Statuses

Comments on USESA: Was previously a candidate, but was removed from candidacy on February 28, 1996 in a notice of review.
U.S. Fish & Wildlife Service Lead Region: R1 - Pacific

NatureServe Global Conservation Status Factors

Range Extent Comments: California endemic, in Scadden Flat near Grass Valley in Nevada County. The two known locations cover about 6 sq mi. in total.

Area of Occupancy: 1-5 4-km2 grid cells
Area of Occupancy Comments: The total covered acreage is less than 10 ac.

Number of Occurrences: 1 - 5
Number of Occurrences Comments: Known from only two occurrences (Bittman 1998, 2005).

Population Size Comments: The exact total number of plants is not known. However, thousands of stems were reported from the Caltrans and nearby private (transplanted) occurrence in 2005. The other separate occurrence is also on private land and is apparently smaller with unknown numbers of plants.

Number of Occurrences with Good Viability/Integrity: None (zero)

Overall Threat Impact: High - medium
Overall Threat Impact Comments: Threatened by altered hydrology, road maintenance, grazing, and non-native plants. EO 1 has in recent times shown effects from disturbance from animal trampling (deer?), an increase in himalayan blackberry thickets and could be threatened by a single car crash or oil/chemical spill off the nearby road. EO 2 has overgrown blackberry as well and possible hydrologic changes (no Typha in recent over-the-fence survey, possibly indicating negative change in hydrology).

Short-term Trend: Decline of 10-30%
Short-term Trend Comments: Short term trend may be declining due to road maintenance, hydrologic changes, weed invasions, etc.

Long-term Trend: Unknown
Long-term Trend Comments: Long term trend is unknown.

Intrinsic Vulnerability Comments: Wetland plant. Only known from very small area in Nevada County, California.

Environmental Specificity: Narrow. Specialist or community with key requirements common.
Environmental Specificity Comments: Only known from open, wet sites in lower Sierra Nevada near Nevada City.

Other NatureServe Conservation Status Information

Distribution
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Global Range: California endemic, in Scadden Flat near Grass Valley in Nevada County. The two known locations cover about 6 sq mi. in total.

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States CA

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
CA Nevada (06057)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
18 Upper Yuba (18020125)+, Upper Bear (18020126)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A perennial herb with elongated rhizomes. Erect stems, 3-6.5dm high; basal leaves never lobed, ovate-elliptical, sessile, mostly 4-7cm long. Leaves finely serrate; stipules leaf-like, forming an involucre-like base to the inflorescence; stems and leaves with simple or 2-3 forked rough-haired trichomes. Inflorescence somewhat headlike, 4cm long, bracts and bracteoles densely covered with coarse hairs. Flowers pink; petals about 1.5cm long.
Palustrine Habitat(s): HERBACEOUS WETLAND
Habitat Comments: Marshes and swamps (montane freshwater) (Skinner, 1997).
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 07Sep2005
NatureServe Conservation Status Factors Author: D. Gries, rev. R. Bittman (7/98), R. Bittman 2005

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
Help
  • 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.

  • Skinner, M.W., and B.M. Pavlik, eds. 1997 (1994). Inventory of rare and endangered vascular plants of California. 1997 Electronic Inventory Update of 1994 5th edition, California Native Plant Society, Special Publication No. 1, Sacramento.

  • U.S. Fish and Wildlife Service (USFWS). 1995. Category and Listing Priority Form.

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