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The Plants of Pennsylvania
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Ann Fowler Rhoads, Timothy A. Block
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A Thousand-mile Walk to the Gulf
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John Muir
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An Illustrated Flora of the Northern United States: Dogbane to thistle
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Nathaniel Lord Britton, Addison Brown
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Species plantarum
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Carl von Linné
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A California Flora
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Philip Alexander Munz
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The Evolution of Plants
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K. J. Willis, J. C. McElwain
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The Different Forms of Flowers on Plants of the Same Species
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Charles Darwin
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Magazine of Horticulture, Botany and All Useful Discoveries and Improvements in Rural Affairs
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Charles Mason Hovey
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Check List of the Forest Trees of the United States
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George Bishop Sudworth, A. L. Johnson, Afroim K. Mlodziansky, Charles Albert Keffer, Charles Theodore Mohr, Filibert Roth, Frederick Vernon Coville, John Millerd Simpson
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The Variation of Animals and Plants Under Domestication
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Charles Darwin
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