Flora of Colorado - Rydberg, Per Axel, 1860 -1931 (Experiment Station, 1906)

... Flora of Glacier National Park, Montana - Standley, Paul Carpenter, 1884 -1963 (Govt. Print. Off, 1921)

A flora of Hollister Ranch, Santa Barbara County, California - Fletcher, Martin (The Herbarium, Department of Biological Sciences, University of California, Santa Barbara, 1983)

Flora of Illinois, containing keys for the identification of the flowering plants and ferns - Jones, George Neville, 1904 -1970 (The University Press, 1945)

Flora of Lancaster County; being descriptions of the seed- plants growing naturally in Lancaster County, Pennsylvanial - Small, John Kunkel, 1869 -1938 (1913)

Flora of Miami; being descriptions of the seed-plants growing naturally on the Everglade Keys and in the adjacent Everglades, southern peninsular Florida - Small, John Kunkel, 1869 -1938 (The author, 1913)

Flora of Nebraska; a list of the conifers and flowering plants of the state with keys for their determination - Petersen, Niels Frederick, 1877 - (1912)

Flora of Nebraska; a list of the conifers and flowering plants of the state, with keys for their determination - Petersen, Niels Frederick, 1877 - (Printed by State Printing Co, 1912)