Barner, J. 2009. Propagation protocol for production of propagules (seeds, cuttings, poles, etc.) Machaeranthera canescens (Pursh) A. Gray seeds. Native Plant Network. U.S. Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources. http://npn.rngr.net/propagation/protocols [Accessed 2017 July 21].