Template:Downie et al., 2002
- Downie, S.R., Hartman, R.L., Sun, F.J. & Katz-Downie, D.S. 2002. Polyphyly of the spring-parsleys (Cymopterus): molecular and morphological evidence suggests complex relationships among the perennial endemic genera of western North American Apiaceae. Canadian Journal of Botany 80(12): 1295–1324. DOI: 10.1139/b02-119 ResearchGate