Meyer, S.E.; Kitchen, S.G. 1994. Habitat-correlated variation in seed germination response to chilling in Penstemon Section Glabri (Scrophulariaceae). The American Midland Naturalist. 132(2): 349-365.

Meyer, S.E.; Kitchen, S.G. 1994. Habitat-correlated variation in seed germination response to chilling in Penstemon Section Glabri (Scrophulariaceae). The American Midland Naturalist. 132(2): 349-365.

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