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References

Clements, R.K., J.M. Baskin, and C.C. Baskin. 1998. The comparative biology of the two closely-related species Penstemon tenuiflorus Pennell and P. hirsutus (L.) Willd. (Scrophulariaceae, section Graciles): I. Taxonomy and geographical distribution. Castanea 63: 138-153.

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