Meyer, S.E. 1992. Habitat correlated variation in firecracker penstemon (Penstemon eatonii Gray: Scrophulariaceae) seed germination response. Bulletin of the Torrey Botanical Club 119(3): 268-279.

Meyer, S.E. 1992. Habitat correlated variation in firecracker penstemon (Penstemon eatonii Gray: Scrophulariaceae) seed germination response. Bulletin of the Torrey Botanical Club 119(3): 268-279.

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