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.
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.
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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