President Jefferson instructed Meriwether Lewis to collect information on “the soil & face of the country, [its] growth & vegetable productions… the animals of the country generally, especially those not of the U.S.” In fulfilling these instructions, members of the Expedition were the first to describe for science 178 plants. The explorers’ written descriptions and the seeds and specimens they collected were Jefferson’s window onto the new west.

Learn more about some of the plants collected and used by the Expedition:

Common camas (Camassia quamash)

Broom snakeweed (Gutierrezia sarothrae)
Bitterroot (Lewisia rediviva)

Ponderosa pine (Pinus ponderosa)

Uniformed NPS ranger and staff member from the Academy of Natural Sciences look at plant specimen collected by Meriwether Lewis.
Academy of Natural Sciences staff member shares a plant specimen collected by Meriwether Lewis.

NPS photo

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    Last updated: September 11, 2018

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