Kitchen, S.G.; Meyer, S.E. 1991. Seed germination of intermountain Penstemons as influenced by stratification and GA3 treatments. Journal of Environmental Horticulture. 9(1): 51-56.

Kitchen, S.G.; Meyer, S.E. 1991. Seed germination of intermountain Penstemons as influenced by stratification and GA3 treatments. Journal of Environmental Horticulture. 9(1): 51-56.

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