Claim: The Sphaeralcea coccinea, a 2-cm-wide flower that is native to grasslands and prairies of the Great Plains and western regions of northern North America, was collected by Meriwether Lewis (American explorer, soldier, politician, and public administrator) in Marias River.
Evidence: The 2-cm-wide flowers are reddish-orange and saucer-shaped, with 5 notched, broad petals, in small terminal clusters. This species is native to grasslands and prairies of the Great Plains and western regions of northern North America. While on the course of his expedition, near the Marias River, Meriwether Lewis collected a specimen of this species. Meriwether Lewis (August 18, 1774 – October 11, 1809) was an American explorer, soldier, politician, and public administrator, best known for his role as the leader of the Lewis and Clark Expedition, also known as the Corps of Discovery, with William Clark.