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Lewis & Clark as Naturalists
The Journals Lewis and Clark as Naturalists

field pennycress

This entry describes one of 30 specimens that were sent to President Jefferson from FortMandan and then logged into the Museum in Philadelphia on November 16, 1805, but subsequently lost.  We include this species as an example of the breadth of discovery and the explorers’ scholarship;  attribution to this species is based upon Lewis’ description, early botanical work on the specimens, current botanical literature, and knowledge of the regional flora. 

Capt. Lewis, May 10, 1804 - N°. 1.  a species of Cress taken at St. Louis May 10th 1804.  it is common in the open grown[d]s on the Mississippi bottoms, appears in the uncultivated parts of the lots gardens and orchards, the seed come to maturity by the 10th of May in most instances.

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