Gray, M.L. 2011. The effects of floral density manipulation on the pollination and reproductive success of Penstemon pachyphyllus. Evanston, IL: Northwestern University. Thesis. 33 p.

Gray, M.L. 2011. The effects of floral density manipulation on the pollination and reproductive success of Penstemon pachyphyllus. Evanston, IL: Northwestern University. Thesis. 33 p.

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