1. Hybrid speciation in Erythronium (Liliaceae): a new allotetraploid species from Washington State;Allen;Systematic Botany,2001
2. Phylogeny and biogeography of Erythronium (Liliaceae) inferred from chloroplast matK and nuclear rDNA ITS sequences;Allen;Systematic Botany,2003
3. The genus Erythronium: a taxonomic and distributional study of the western North American species;Applegate;Madroño,1935