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Parkinson, H.; DeBolt, A. 2005. Propagation protocol for production of container Penstemon acuminatus. Native Plant Network. U.S. Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources. http://NativePlantNetwork.org
Parkinson, H.; DeBolt, A. 2005. Propagation protocol for production of container Machaeranthera canescens. Native Plant Network. U.S. Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources. http://NativePlantNetwork.org
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