Tilley, D. 2011. Propagation protocol for production of propagules Psoralidium lanceolatum (Pursh) Rydb. 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 2021 October 5].

Tilley, D. 2011. Propagation protocol for production of propagules Psoralidium lanceolatum (Pursh) Rydb. 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 2021 October 5].