Lomatium dissectum, also known as Fernleaf biscuitroot, has 45000 seeds per pound. It is native to much of western North America, where it grows in varied habitat. It is found in the eastern slopes of the Cascade Range, Rocky Mountains, Klamath Mountains, eastern Transverse Ranges and the Sierra Nevada in California. 
More Info: USDA Plant Guide: https://plants.usda.gov/DocumentLibrary/plantguide/pdf/pg_lodi.pdf