The taxonomy of this species is uncertain. Authors call it Thlaspi californicum,Thlaspi californicum. Jepson Manual Treatment. Retrieved August 17, 2011.Thlaspi californicum. The Nature Conservancy. Retrieved August 17, 2011.Kneeland Prairie penny-cress (Thlaspi californicum) 5-Year Review: Summary and Evaluation. USFWS (June 2006). Retrieved August 16, 2011. Thlaspi montanum var. californicum,Thlaspi californicum. CalFlora. Retrieved August 17, 2011. Noccaea californica,Noccaea californica. USDA Plants Profile. Retrieved August 17, 2011. and Noccaea fendleri ssp. californica,Noccaea fendleri ssp. californica. Flora of North America. Retrieved August 17, 2011. and there are other synonyms.
