FACULTATIVE OUTCROSSING INFERRED FROM POLLEN–OVULE RATIOS IN PENSTEMON DEGENERI (PLANTAGINACEAE), A RARE COLORADO ENDEMIC
Author:
Affiliation:
1. Department of Integrative Biology, University of Colorado Denver, Denver, CO 80217 (AB, CTE, AS, LPB)
2. Research and Conservation, Denver Botanic Gardens, Denver, CO 80206 (CA, AS, LPB)
Publisher
Southwestern Association of Naturalists
Subject
Ecology, Evolution, Behavior and Systematics
Reference13 articles.
1. B. L. Beatty, W. F. Jennings, R. C. Rawlinson, "Penstemon degeneri Crosswhite (Degener's beardtongue): a technical conservation assessment." (2004)
2. F. S. Crosswhite, "American Midland Naturalist." 74, "Revision of Penstemon section Penstemon (Scrophulariaceae) II. A western alliance in series Graciles." 429 (1965)
3. R. W. Cruden, "Evolution." 31, "Pollen–ovule ratios: a conservative indicator of breeding systems in flowering plants." 32 (1977)
4. R. W. Cruden and S. Miller-Ward "Evolution." 35, "Pollen–ovule ratio, pollen size, and the ratio of stigmatic area to the pollen-bearing area of the pollinator: an hypothesis." 964 (1981)
5. C. T. English, "Effective pollination in a rare Colorado endemic, Penstemon degeneri." (2008)
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