Scadden Flat Checkerbloom / Center For Plant Conservation
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Plant Profile

Scadden Flat Checkerbloom (Sidalcea stipularis)

  • Global Rank: G1 - Critically Imperiled
  • Legal Status: N/A
  • Family: Malvaceae
  • State: CA
  • Nature Serve ID: 152327
  • Lifeform: Forb/herb
  • Date Inducted in National Collection: 10/15/2005

Where is Scadden Flat Checkerbloom (Sidalcea stipularis) located in the wild?

States & Provinces:

Scadden Flat Checkerbloom can be found in California

Which CPC Partners conserve Scadden Flat Checkerbloom (Sidalcea stipularis)?

CPC's Plant Sponsorship Program provides long term stewardship of rare plants in our National Collection. We are so grateful for all our donors who have made the Plant Sponsorship Program so successful. We are in the process of acknowledging all our wonderful plant sponsorship donors on our website. This is a work in progress and will be updated regularly.

Conservation Actions

Center for Plant Conservation
  • 12/10/2021
  • Genetic Research

In July of 2001, authors Katarina Andreasen and Bruce Baldwin published "Unequal Evolutionary Rates Between Annual and Perennial Lineages of Checker Mallows (Sidalcea, Malvaceae): Evidence from 18S–26S rDNA Internal and External Transcribed Spacers" in the Journal Molecular Biology and Evolution.

Center for Plant Conservation
  • 12/10/2021
  • Reproductive Research

Tamara Sasaki completed a PhD thesis at California State University, Sacramento, entitled "The Autecology and Reproductive Biology of the Scadden Flat Checkerbloom, Sidalcea Stipularis Howell & True (malvaceae)" in 1997.

  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 2 accessions of Sidalcea stipularis in orthodox seed collection. There are as many as 743 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.

Nature Serve Biotics
  • 05/02/2017

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.


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Taxon Sidalcea stipularis
Authority Howell et True
Family Malvaceae
CPC Number 44454
ITIS 505214
Duration Perennial
Common Names Scadden Flat Checkerbloom
Associated Scientific Names Sidalcea stipularis
State Rank
State State Rank
California S1
Ecological Relationships


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