]> [author note: Herbarium and types: G and US (material from Panama), NY (South Dakota, Nebraska, Florida), NESH (Nevada)] [collector note: South Dakota, Nebraska and Florida: NY, Nevada: NESH, Panama: (1914): G, US] Botany Petersen, Niels Frederick Petersen, Niels Frederick N. F. Petersen N. Petersen Niels Frederick Petersen 1877 1940