What geographic features did Lewis and Clark discover? Lewis and Clark also discovered or carefully described for the first time at least seven Great Plains species of mammals, including the pronghorn, grizzly bear, swift fox, black-tailed prairie dog, white-tailed jackrabbit, bushy-tailed woodrat, and mule deer. What flora and fauna did Lewis and Clark discover? Silver-leaf psoralea silvery scurfpea.Scientific name: Maclura pomifera – Lewis first described this on March 3, 1804. Lewis and Clark’s Scientific Discoveries: Plants What are 5 plants that Lewis and Clark discovered? Lewis recorded and pressed and preserved some 240 different plant species and brought them back to Washington, along with hundreds of animal and bird skins and skeletons. Throughout the Corps’ more than 4,000-mile journey, Captains Lewis and Clark recorded 178 plants and 122 animals not previously known to science. Lewis originally called it a “globular prickly pear” but then provided sufficient details to identify it as a new and different species. What plants did Lewis and Clark discover?Ī cactus that Meriwether Lewis carefully documented was the Missouri Foxtail Cactus, which he first observed in July 1805 near today’s Three Forks, Montana. 15 What animals were found in the Lewis and Clark Expedition?.