Gray, A., & Sprague, I. (1849). Genera floræ Americæ Boreali-orientalis illustrata.: The genera of the plants of the United States illustrated by figures and analyses from nature. G. P. Putnam.
MLA CitationGray, Asa, and Isaac Sprague. Genera Floræ Americæ Boreali-orientalis Illustrata.: The Genera of the Plants of the United States Illustrated by Figures and Analyses from Nature. G. P. Putnam, 1849.
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