2 volumes, 8vo (219 x 136 mm). 24 engraved plates (some browning and staining). Contemporary green cloth, paper labels to spines (some wear to labels, rebacked preserving original spines); folding case. Provenance: Bacon free Library (bookplate, remnants of label on spine of vol.I).

Second edition of "the most important work which had hitherto been published on the Botany of North America" (Sabin), which includes descriptions of plants from the Lewis and Clark expedition.  Pursh worked with Bernard M'Mahon, one of the stewards of Lewis and Clark's plant specimens, on the work, which includes nine plates engraved and signed by Hooker after drawings by Pursh. Sabin 66728.