Manual of botany for North America : containing generic and specific descriptions of the indigenous plants and common cultivated exotics, growing north of the gulf of Mexico ; part first: North American plants, arranged according to the Linnean artificial method; improved by Persoon, Pursh, Nuttall, and others ; part second: North American plants, arranged according to Jussieu's natural method; improved by Lindley, Brown, De Candolle, and others / by Prof. Amos Eaton