1. Argus GW, Eckenwalder JE, Kiger RW. Salicaceae. In: Flora of North America Editorial Committee, editor. Flora of North America. Oxford and New York: Oxford University Press; 2010.
2. Fang Z, Zhao S, Skvortsov AK. Salicaceae. In: Wu ZY, Raven PH, Hong DY, editors. Flora of China. Beijing & St. Louis: Science Press & Missouri Botanical Garden Press; 1999.
3. Skvortsov AK. Willows of Russia and Adjacent Countries. Joensuu, Finland: University of Joensuu; 1999.
4. Rechinger KH. Salix taxonomy in Europe - problems, interpretations, observations. P Roy Soc Edinb B. 1992;98:1–12.
5. Percy DM, Argus GW, Cronk QC, Fazekas AJ, Kesanakurti PR, Burgess KS, et al. Understanding the spectacular failure of DNA barcoding in willows (Salix): does this result from a trans-specific selective sweep? Mol Ecol. 2014;23:4737–56.