Mapping will be based on a standard reference mark based on political units when available.
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North America
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United States
:
Hartman, R. L. & B. E. Nelson. 1998. Novelties from North America north of Mexico: A 20-Year Vascular plant Diversity Baseline. 1–51 (mss.).
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United States
:
Wagner, W. H. J., A. R. Smith & T. R. Pray. 1983. A cliff brake hybrid Pellaea bridgesii x mucronata and its systematic significance. Madroño 30: 69–83.
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United States
California:
Hartman, R. L. & B. E. Nelson. 1998. Novelties from North America north of Mexico: A 20-Year Vascular plant Diversity Baseline. 1–51 (mss.).
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United States
California:
Wagner, W. H. J., A. R. Smith & T. R. Pray. 1983. A cliff brake hybrid Pellaea bridgesii x mucronata and its systematic significance. Madroño 30: 69–83.