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Aandahl, A.R. et al. 1960. Soils of the North Central Region of the United States. Agricultural Experiment Station. University of Wisconsin. Madison.

Achmatov, K.A. 1976. Adaptation of Woody Plants to Drought.

Adams, K.S. 1956. Native Grasses: Legumes and Forbs: Section 2 of a series. Phillips Petroleum Company. Bartlesville, OK.

Adams, K.S. 1956. Undesirable Grasses and Forbs: Section 3 of a series.. Phillips Petroleum Company. Bartlesville, OK.

Adams, K.S. 1957. Poisonous Grassland Plants: Section 4 of a series. Phillips Petroleum Company. Bartlesville, OK.

Adams, K.S. 1958. Introduced Grasses and Legumes: Section 5 of a series. Phillips Petroleum Company. Bartlesville, OK.

Adams, K.S. 1960. Introduced Grasses and Legumes: Section 6 of a series. Phillips Petroleum Company. Bartlesville, OK.

Anderson, B. 1976. Wild Flower Name Tales. Century One Press. Colorado Springs.

Anderson, J.P. 1959. Flora Of Alaska and Adjacent Parts of Canada. Iowa State University Press. Ames.

Argus, G.W. 1973. The Genus Salix in Alaska and the Yukon. National Museums of Canada. Ottawa.

Barkley, T.M. ed. 1986. Flora of the Great Plains. University Press of Kansas. Lawrence.

Barneby, R.C. 1964. Atlas of North American Astragalus: Part I - The Phacoid and Homaloboid Astragali. The New York Botanical Garden. Bronx.

Barneby, R.C. 1964. Atlas of North American Astragalus: Part II - The Cercidothrix, Hypoglottis, Piptoloboid, Trimeniaeus and Orophaca Astragali. The New York Botanical Garden. Bronx.

Barnhart, C.L. 1953. The American College Dictionary. Random House. New York.

Barnhart, C.L. 1964. The American College Dictionary. Random House. New York.

Barrell, J. 1969. Flora of the Gunnison Basin: Gunnison, Saguache, and Hinsdale Counties, Colorado. Natural Land Institute. Rockford, IL.

Bear, S. 1968. At Home in the Wilderness. Naturegraph Press. Healdsburg, CA.

Beckman, W.C. 19(5?). Guide to the Fishes of Colorado. Colorado Cooperative Fishery Research Unit. Colorado Game and Fish Department. Denver.

Bergen, J.Y. 1903. Foundations of Botany. The Athenaeum Press. Boston.

Bliss, A. 1978. Weeds: a Guide for Dyers and Herbalists. Juniper House. Boulder.

Bliss, R.K. 19(?) A Handbook of the Native Trees of Iowa. Extension Service, Agriculture and Home Economics. Ames.

Boissevain, C.H. & C. Davidson. 1940. Colorado Cacti: an illustrated guide describing all of the native Colorado cacti. Abbey Garden Press. Pasadena.

Branch of Cartography, Geographic Names Team. 1979. Colorado Geographic Names: Book I. Office of Research & Technical Standards. Reston, VA.

Branch of Cartography, Geographic Names Team. 1979. Colorado Geographic Names: Book II. Office of Research & Technical Standards. Reston, VA.

Breitlung, A.J. Annotated Catalogue of the Vascular Flora of Saskatchewan. University of Notre Dame Press. Notre Dame, IN.

Broun, M. 1938. Index to North American Ferns. Science Press Printing Co. Lancaster, PA.

Buchanan, E.D. & R.E. Buchanan. 1924. Bacteriology: revised edition. The Macmillan Company. New York.

Burbidge, N.T. 1960. The Phytogeography of the Australian Region. Commonwealth Scientific and Industrial Research Organization. Melbourne, Australia.

Carter, J.L. 1988. Trees and Shrubs of Colorado. Johnson Books. Boulder.

Chronic, H. 1980. Roadside Geology of Colorado. Mountain Press Publishing Co. Missoula.

Claraso, N. 1953. Nuestres Flores Mas Cultivadas. Editorial Gustavo Gili, S.A. Barcelona.

Core, E.L. 1955. Plant Taxonomy. Prentice-Hall, Inc. Englewood Cliffs, N.J.

Correll, D.S. & H.B. Correll. 1975. Aquatic and Wetland Plants of Southwestern United States: Volume I. Stanford University Press. Stanford.

Correll, D.S. & H.B. Correll. 1975. Aquatic and Wetland Plants of Southwestern United States: Volume II. Stanford University Press. Stanford.

Correll, D.S. 1956. Ferns and Fern Allies of Texas. The George Banta Company, Inc. Menasha, WI.

Coulter, J.M., C.R. Barnes, & H.C. Cowles. 1910. A Textbook of Botany: Volume I, Part I - Morphology. American Book Company. New York, Cinncinnati, Chicago.

Coulter, J.M., C.R. Barnes, & H.C. Cowles. 1911. A Textbook of Botany: Volume II - Ecology. American Book Company. New York, Cinncinnati, Chicago.

Coulter, J.M. 1885. Manual of the Botany of the Rocky Mountain Region. American Book Company. New York, Cincinnati, Chicago.

Coulter, J.M. & A. Nelson. 18?? New Manual of Rocky Mountain Botany. American Book Company. New York.

Coville, F.V. 1893. Contributions from the National Herbarium: Volume IV - Botany of the Death Valley Expedition. Government Printing Office. Washington, D.C.

Craighead, F.C., Jr. & J.J. Craighead. 1958. How to Survive on Land and Sea: Individual Survival. United States Naval Institute. Annapolis.

Cronquist, A., A.H. Holmgren, N.H. Holmgren, & J.L. Reveal. 1986. Intermountain Flora: Vascular Plants of the Intermountain West, U.S.A.: Volume I - Geological and botanical history of the region, its plant geography and a glossary. The vascular cryptograms and the gymnosperms. New York Botanical Garden. Bronx.

Cronquist, A., A.H. Holmgren, N.H. Holmgren, J.L. Reveal, P.K. Holmgren & R.C. Barneby. 1989. Intermountain Flora: Vascular Plants of the Intermountain West, U.S.A.: Volume III, Part B - Fabales. New York Botanical Garden. Bronx.

Cronquist, A., A.H. Holmgren, N.H. Holmgren, J.L. Reveal, & P.K. Holmgren. 1984. Intermountain Flora: Vascular Plants of the Intermountain West, U.S.A.: Volume IV - Subclass Asteridae (except Asteraceae). New York Botanical Garden. Bronx.

Cronquist, A., A.H. Holmgren, N.H. Holmgren, J.L. Reveal, & P.K. Holmgren. 1994. Intermountain Flora: Vascular Plants of the Intermountain West, U.S.A.: Volume V - Asterales. New York Botanical Garden. Bronx.

Cronquist, A., A.H. Holmgren, N.H. Holmgren, J.L. Reveal, & P.K. Holmgren. 1977. Intermountain Flora: Vascular Plants of the Intermountain West, U.S.A.: Volume VI - The Monocotyledons. Columbia University Press. New York.

Cronquist, A., A.H. Holmgren, N.H. Holmgren, J.L. Reveal, & P.K. Holmgren. 1994. Intermountain Flora: Vascular Plants of the Intermountain West, U.S.A.: Volume VI - The Monocotyledons. New York Botanical Garden. Bronx.

Cronquist, A. 1960. The Divisions and Classes of Plants. Reprinted from the Botanical Review, v.26 no.4, pp. 425- 482.

Cruickshank, H.G. 1961. John and William Bartram's America: Selections from the Writings of the Early American Naturalists. The Natural History Library Anchor Books. Doubleday & Company, Inc. Garden City, NY

Dalla Torre, C.G. de & H. Harms. 1907. Genera Siphonogamarum. Sumtibus Guilelmi Engelmann. Lipsiae.

Davis, R.J. 1952. Flora of Idaho. Wm. C. Brown Company. Dubuque.

Dayton, W.A. 1931. Glossary of Botanical Terms Commonly Used in Range Research. United States Department of Agriculture. Washington, D.C.

Dayton, W.A. 1950. Glossary of Botanical Terms Commonly Used in Range Research: revised. United States Department of Agriculture. Washington, D.C.

Dayton, W.A. et al. 1937. Range Plant Handbook. United States Government Printing Office. Washington, D.C.

Dittmer, H.J. et al. 1954. The Ferns and Fern Allies of New Mexico. University of New Mexico Press. Albuquerque.

Dorn, R.D. 1977. Manual of the Vascular Plants of Wyoming: Volume I - Equisetaceae to Grossulariaceae. Garland Publishing, Inc. New York & London.

Dorn, R.D. 1977 Manual of the Vascular Plants of Wyoming: Volume II - Haloragaceae to Zygophyllaceae. Garland Publishing, Inc. New York & London.

Dorn, R.D. 1984. Vascular Plants of Montana. Mountain West Publishing. Cheyenne.

Dorn, R.D. 1988. Vascular Plants of Wyoming. Mountain West Publishing. Cheyenne.

Durrell, L.W. et al. 1950. Poisonous and Injurious Plants in Colorado. Colorado A & M College. Fort Collins.

Eastwood, A. 1900. Bergen's Elements of Botany: Key and Flora; Rocky Mountain Edition. The Athenaeum Press. Boston.

Eastwood, A. 1893. A Popular Flora of Denver, Colorado. Zoe Publishing Company. San Francisco.

Everhart, W.H. & W.R. Seaman. 1971. Fishes of Colorado. Colorado Game, Fish and Parks Division. Denver.

Ewan, J. 1950. Rocky Mountain Naturalists. University of Denver Press. Denver.

Fernald, M.L. 1950. Gray's Manual of Botany. American Book Company. New York.

Forman, L. & D. Bridson. 1989. The Herbarium Handbook. Royal Botanic Gardens, Kew. Whitstable Litho Printers. Great Britain.

Gannett, H. 1906. A Gazetteer of Colorado. Government Printing Office. Washington, D.C.

Gates, F.C. 1937. Grasses in Kansas. Kansas State Printing Plant. Topeka.

Gates, F.C. 1941. Weeds in Kansas. Kansas State Printing Plant. Topeka.

Gates, F.C. 1934. Wild Flowers in Kansas. Kansas State Printing Plant. Topeka.

Gibbons, E. 1966. Stalking the Healthful Herbs. David McKay Company, Inc. New York.

Gleason, H.A. 1952. The New Britton and Brown Illustrated Flora of the Northeastern United States and Adjacent Canada: Volume I - The Pteridophyta, Gymnospermae, and Monocotyledoneae. Lancaster Press. Lancaster, PA.

Gleason, H.A. 1952. The New Britton and Brown Illustrated Flora of the Northeastern United States and Adjacent Canada: Volume II - The Choripetalous Dicotyledoneae. Lancaster Press. Lancaster, PA.

Gleason, H.A. 1952. The New Britton and Brown Illustrated Flora of the Northeastern United States and Adjacent Canada: Volume III - The Sympetalous Dicotyledoneae. Lancaster Press. Lancaster, PA

Gould, F.W. 1968. Grass Systematics. McGraw-Hill Book Company, Inc. New York.

Gray, A. & J.M. Coulter. 1885. Text-Book of Western Botany, consisting of Coulter's Manual of the Botany of the Rocky Mountains, to which is prefixed Gray's Lessons in Botany. Ivison, Blakeman, Taylor, and Co. New York & Chicago.

Gray, A., revised and extended by L.H. Bailey. 1895. Gray's Field, Forest, and Garden Botany: revised edition. American Book Company. New York, Cinncinnati, Chicago.

Gunn, C.R. et al. 1992. Families and Genera of Spermatophytes Recognized by the Agricultural Research Service. Agricultural Research Service. Washington, D.C.

Gunori, T. 1947. Edible Wild Plants of Japan. Hobun-Shorin. Japan.

Guyer, M.F. 1941. Animal Biology: 3rd Edition. Herper & Brothers. New York & London.

Harrington, H.D. & L.W. Durrell. 1950. Colorado Ferns and Fern Allies: Pteridophyta. Colorado Agricultural Research Foundation. Colorado Agricultural and Mechanical College. Fort Collins.

Harrington, H.D. 1931. An Ecological Study Concerning the Winter Condition of the Buds and Twigs of Iowa Trees. State University of Iowa. Iowa City..

Harrington, H.D. 1967. Edible Native Plants of the Rocky Mountains. University of New Mexico Press. Albuquerque.

Harrington, H.D. 1957. How to Identify Plants. Sage Books. Denver.

Harrington, H.D. & L.W. Durrell. 1944. Key to Some Colorado Grasses in Vegetative Condition. Colorado Agricultural Experiment Station, Colorado State College. Fort Collins.

Harrington, H.D. 1940. Keys to the Woody Plants of Iowa in Vegetative Condition. University of Iowa. Iowa City.

Harrington, H.D. 1964. Manual of the Plants of Colorado. 2nd Edition. The Swallow Press, Inc. Chicago.

Harrington, H.D. 1972. Western Edible Wild Plants. University of New Mexico Press. Albuquerque.

Harrington, H.D. 1934. The Woody Plants of Iowa in Winter Condition. University of Iowa. Iowa City.

Hattori, K. & Kondo, S. 1942. Science of Edible Plants: 3rd Edition. Kagaku-Shoin. Japan.

Hayashi, Y. & Kawamoto, T. 1942. Wild Food Plants of Chosen (Korea). The Forest Experiment Station Government-General of Chosen. Keijo, Japan.

Hayes, D.W. 1960. Key to Important Woody Plants of Eastern Oregon and Washington. United States Government Printing Office. Washington, D.C.

Hermann, F. J. 1970. Manual of the carices of the Rocky Mountains and Colorado basin. Agriculture Handbook No. 374. Forest Service. U.S. Department of Agriculture. Washington D.C.

Hermann, F.J. 1974. Manual of the Genus Carex in Mexico and Central America. Forest Service. United States Government Printing Office. Washington, D.C.

Herzman, C.W. et al. 1959. Handbook of Colorado Native Grasses. Colorado State University Extension Service. Fort Collins.

Hickman, J.C. ed. 1993. The Jepson Manual: Higher Plants of California. University of California Press. Berkeley & Los Angeles.

Hitchcock, A.S. 1935. Manual of the Grasses of the United States. United States Government Printing Office. Washington D.C.

Hitchcock, A.S. 1950. Manual of the Grasses of the United States. 2nd Edition. United States Government Printing Office. Washington D.C.

Hitchcock, A.S. 1971. Manual of the Grasses of the United States: Volume I. 2nd Edition. Dover Publications, Inc. New York.

Hitchcock, A.S. 1971. Manual of the Grasses of the United States: Volume II. 2nd Edition. Dover Publications, Inc. New York.

Hitchcock, A.S. 1925. Methods of Descriptive Systematic Botany. John Wiley & Sons, Inc. New York.

Hitchcock, A.S. & A. Chase. 1910. The North American Species of Panicum. Government Printing Office. Washington, D.C.

Hitchcock, C.L. et al. 1977. Vascular Plants of the Pacific Northwest: Part I - Vascular Crytogams, Gymnosperms, and Monocotyledons. University of Washington Press. Seattle & London.

Hitchcock, C.L. et al. 1977. Vascular Plants of the Pacific Northwest: Part II - Salicaceae to Saxifragaceae. University of Washington Press. Seattle & London.

Hitchcock, C.L. et al. 1977. Vascular Plants of the Pacific Northwest: Part III - Saxifragaceae to Ericaceae. University of Washington Press. Seattle & London.

Hitchcock, C.L. et al. 1977. Vascular Plants of the Pacific Northwest: Part IV - Ericaceae to Campanulaceae. University of Washington Press. Seattle & London.

Hitchcock, C.L. et al. 1977. Vascular Plants of the Pacific Northwest: Part V - Compositae. University of Washington Press. Seattle & London.

Holman, R.M. & W.W. Robbins. 1934. A Textbook of General Botany. 3rd Edition. John Wiley & Sons, Inc. New York.

Hughes, H.D., M.E. Heath., & D.S. Metcalf. 1952. Forages: the Science of Grassland Agriculture. The Iowa State College Press. Ames.

Huxley, A. 1987. Plant and Planet. Penguin Books. New York.

Irvine, A. 1838. The London Flora. Smith, Elder and Co. London.

Jaeger, E. 1947. Wildwood Wisdom. The Macmillan Company. New York.

Jeffs, R.E. & E.L. Little. 1930. A Preliminary List of the Ferns and Seed Plants of Oklahoma. University of Oklahoma Press. Norman.

Jepson, W.L. 1925. A Manual of the Flowering Plants of California. Independent Pressroom and Williams Printing Company. San Francisco.

Jepson, W.L. 1902. A School Flora for the Pacific Coast. D. Appleton and Company. New York.

Johnson, W.M. 1964. Field Key to the Sedges of Wyoming. University of Wyoming Agricultural Experiment Station. Laramie.

Kartesz, J.T. & R. Kartesz. 1980. A Synonymized Checklist of the Vascular Flora of the United States, Canada, and Greenland: Volume II, The Biota of North America. University of North Carolina Press. Chapel Hill.

Kartesz, J.T. 1994. A Synonymized Checklist of the Vascular Flora of the United States, Canada, and Greenland: 2nd edition; Volume I - Checklist. Timber Press. Portland, OR.

Kartesz, J.T. 1994. A Synonymized Checklist of the Vascular Flora of the United States, Canada, and Greenland: 2nd edition; Volume II - Thesaurus. Timber Press. Portland, OR.

Kashiwagi, G. 1946. Edible Wild Plants of Sanriku District (Northern Pacific Coast Area), Japan: Part I. Aomori Forest Experiment Station. Japan.

Kearney, T.H. & R.H. Peebles. 1960. Arizona Flora. University of California Press. Berkeley & Los Angeles.

Kearney, T.H. & R.H. Peebles. 1942. Flowering Plants and Ferns of Arizona. United States Government Printing Office. Washington D.C.

Kelly, G.W. 1970. A Guide to the Woody Plants of Colorado. Pruett Publishing Company. Boulder.

Kinch, R.C. 1936. Nebraska Weeds. Department of Agriculture and Inspection. Lincoln.

Kinch, R.C. 1942. Nebraska Weeds. Department of Agriculture and Inspection. Lincoln.

Kingsbury, J.M. 1964. Poinsonous Plants of the United States and Canada. Prentice-Hall, Inc. Englewood Cliffs, NJ.

Kirk, D.R. 1970. Wild Edible Plants of the Western United States. Naturegraph Publishers. Healdsburg, CA.

LeCrone, F. et al. 1951. An Elementary Course in General Horticulture. Semco Color Press, Inc. Oklahoma City.

Leonard, W.H. & J.H. Martin. 1963. Cereal Crops. The Macmillan Company. New York.

Linnaeus, C. 1754 (1939). Genera Plantarum. Tokyo

Linnaeus, C. 1753 (1934). Species Plantarum: Volume I. Tokyo.

Linnaeus, C. 1753 (1934). Species Plantarum: Volume II. Tokyo.

Linnaeus, C. 1781 (1938). Supplementum Plantarum: Systematis Vegetabilium, Generum Plantarum, Specierum Plantarum. Tokyo.

Little, E.L., Jr. 1953. Check List of Native and Naturalized Trees of the United States (including Alaska). Forest Service. United States Government Printing Office. Washington, D.C.

Little, E.L., Jr. 1952. To Know the Trees: Important Forest Trees of the United States. U.S. Government Printing Office. Washington, D.C.

Longyear, B.O. 1925. Evergreens of Colorado. Multigraph Service Bureau, Colorado Agricultural College. Fort Collins.

Longyear, B.O. 1909. Rocky Mountain Wild Flower Studies. Merchants Publishing Co. Denver.

Mabberley, D.J. 1987. The Plant-Book: a portable dictionary of the higher plants. Cambridge University Press. Cambridge.

MacFayden, J. 1837. The Flora of Jamaica. Longman, Orme, Brown, Green, & Longmans. London.

Makino, T. 1948. An Illustrated Flora of Japan, with the Cultivated and Naturalized Plants. Hokuryu Kan Publishing Co. Tokyo.

Martin, J.H. & W.H. Leonard. 1949. Principles of Field Crop Production. The Macmillan Company. New York.

Matsumura, Y. & H.D. Harrington. 1955. The True Aquatic Vascular Plants of Colorado. Colorado Agricultural Experiment Station, Colorado Agricultural and Mechanical College. Fort Collins.

McKean, W.T. 1976. Winter Guide to Central Rocky Mountain Shrubs (with Summer Key). State of Colorado Department of Natural Resources Division of Wildlife. Denver.

McKean, W.T. 1956. Winter Guide to Native Shrubs of the Central Rocky Mountains with Summer Key. State of Colorado Department of Game and Fish. Denver.

McKell, C.M., J.P. Blaisdell, & J.R. Goodin. 1972. Wildland Shrubs - their Biology and Utilization. Intermountain Forest and Range Experiment Station. Ogden.

McQueen, C.B. 1990. Field Guide to the Peat Mosses of Boreal North America. University Press of New England. Hanover & London.

McVaugh, R. 1956. Edward Palmer: Plant Explorer of the American West. University of Oklahoma Press. Norman.

McVaugh, R. & F.R. Fosberg. 1941. Contributions Toward a Flora of Nevada, No. 29; Index to the Geographical Names of Nevada: Part I - (A - Ech). U.S. Department of Agriculture. Washington, D.C.

McVaugh, R. & F.R. Fosberg. 1941. Contributions Toward a Flora of Nevada, No. 29; Index to the Geographical Names of Nevada: Part II - (Eck - Pab). U.S. Department of Agriculture. Washington, D.C.

McVaugh, R. & F.R. Fosberg. 1941. Contributions Toward a Flora of Nevada, No. 29; Index to the Geographical Names of Nevada: Part III - (Pab - Z). U.S. Department of Agriculture. Washington, D.C.

Miracle, L. & M.H. Decker. 1961. Complete Book of Camping. Outdoor Life; Harper & Brothers. New York.

More, R.E. 1943. Colorado Evergreens. University of Denver Press. Denver.

Morin, N.R. 1993. Flora of North America: Volume I - Introduction. Oxford University Press. New York & Oxford.

Morin, N.R. 1993. Flora of North America: Volume II - Pteridophytes and Gymnosperms. Oxford University Press. New York & Oxford.

Moritomo, M. 1947. Wild Edible Plants of Japan. Asakura-Shoten. Japan.

Morris, M.S., J.E. Schmautz, & P.F. Stickney. 1962. Winter Field Key to the Native Shrubs of Montana. Montana Forest and Conservation Experiment Station & Intermountain Forest and Range Experiment Station. Washington, D.C.

Moss, E.H. 1959. Flora of Alberta. University of Toronto Press. Toronto.

Muenscher, W.C. 1944. Aquatic Plants of the United States. Comstock Publishing Company, Inc. Ithaca, NY.

Munns, E.N. 1938. The Distribution of Important Forest Trees of the United States. United States Department of Agriculture. Washington, D.C.

Nakamura, Y. 1944. Edible Wild Plants of Japan. Mainichi News Co. Japan.

Nelson, R.A. 1979. Handbook of Rocky Mountain Plants. Skyland Publishers. Estes Park.

Nelson, R.A. 1953. Plants of Rocky Mountain National Park. United States Government Printing Office. Washington, D.C.

Pammel, L.H. & C.M. King. 1926. The Weed Flora of Iowa. Iowa Geological Survey. Des Moines.

Pammel, L.H. & C.M. King. 1930. Honey Plants of Iowa. Iowa Geological Survey. Des Moines.

Parker, K.F. 1972. An Illustrated Guide to Arizona Weeds. University of Arizona Press. Tucson.

Patterson, R.E. 19(6?). Texas Plants Poisonous to Livestock. Texas A & M University. College Station, TX.

Peattie, D.C. 1930. Flora of the Indiana Dunes. Field Museum of Natural History. Chicago.

Peattie, D.C. 1936. Green Laurels: the Lives and Achievements of the Great Naturalists. The Literary Guild. New York.

Peck, M.E. 1961. A Manual of the Higher Plants of Oregon. Metropolitan Printing Company. Portland.

Pepoon, H.S. 1927. An Annotated Flora of the Chicago Region. The Lakeside Press. Chicago.

Pesman, M.W. 1975. Meet the Natives: an easy way to recognize wildflowers, trees and shrubs of the central rocky mountain region. World Press, Inc. Denver.

Piper, C.V. & R.K. Beattie. 1914. Flora of Southeastern Washington. and Adjacent Idaho. The New Era Printing Co. Lancaster, PA.

Polunin, N. 1959. Circumpolar Arctic Flora. Clarendon Press. Oxford.

Pool, R.J. 1929. Flowers and Flowering Plants: an Introduction to the Nature and Work of Flowers and the Classification of Flowering Plants. 1st Edition. McGraw-Hill Book Company, Inc. New York & London.

Ramaley, F. 1927. Colorado Plant Life. University of Colorado. Boulder.

Randall, C.E. & D.P. Edgerton. 1939. Famous Trees. United States Department of Agriculture. Washington, D.C.

Rehder, A. 1960. Manual of Cultivated Trees and Shrubs. 2nd Edition. The Macmillan Company. New York.

Richards, A. 1931. Outline of Comparative Embryology. John Wiley & Sons, Inc. New York.

Ringle, W.E. & L.A. Kenoyer. 1903. Student's Botany of Eastern Kansas. Crane & Company, Publishers. Topeka.

Robbins, W.W. 1917. The Botany of Crop Plants. P. Blakiston's Son & Co. Philadelphia.

Robinson, B.L. & M.L. Fernald. 1908. Gray's New Manual of Botany: 7th Edition - A Handbook of the Flowering Plants and Ferns of the Central and Northeastern United States and Adjacent Canada. American Book Company. New York, Cinncinnati, Chicago.

Rollins, R.C. & E.A. Shaw. 1973. The genus Lesquerella (Cruciferae) in North America. Harvard University Press. Cambridge, MA.

Rosendahl, C.O. 1955. Trees and Shrubs of the Upper Midwest. University of Minnesota Press. Minneapolis.

Rydberg, P.A. 1906. Flora of Colorado. Agricultural Experiment Station, Fort Collins. The New Era Printing Company. Lancaster, PA.

Rydberg, P.A. 1900. Flora of Montana and the Yellowstone National Park. The New Era Printing Company. Lancaster, PA.

Rydberg, P.A. 1932. Flora of the Prairies and Plains of Central North America. The Science Press Printing Company. Lancaster, PA.

Rydberg, P.A. 1917. Flora of the Rocky Mountains and the Adjacent Plains. Steinman & Foltz. Lancaster, PA.

Sakisaka, M. ( ? ). Wild Edible Plants in Manchuria. Chiba-Shoten. Japan.

Sargent, C.S. 1905. Manual of the Trees of North America (exclusive of Mexico). Houghton, Mifflin and Company. Boston & New York.

Sargent, F.L. 1913. Plants and their Uses. Henry Holt and Company. New York.

Schery, R.W. 1952. Plants for Man. Prentice-Hall, Inc. New York.

Schultz, E.D. 1928. Texas Wild Flowers. Laidlaw Brothers Publishers. Chicago & New York.

Scoggan, H.J. 1978. The Flora of Canada: Part I - General Survey. National Museums of Canada. Ottawa.

Scoggan, H.J. 1978. The Flora of Canada: Part II - Pteridophyta, Gymnospermae, Monocotyledoneae. National Museums of Canada. Ottawa.

Scoggan, H.J. 1978. The Flora of Canada: Part III - Dicotyledoneae (Saururaceae to Violaceae). National Museums of Canada. Ottawa.

Shaw, R.J. & D. On. 1979. Plants of Waterton-Glacier National Parks and the Northern Rockies. Mountain Press Publishing Company. Missoula.

Shosteck, R. 1974. Flowers and Plants: and International Lexicon with Biographical Notes. The New York Times Book Company. New York.

Sinnott, E.W. 1929. Botany: Principles and Problems: 2nd Edition. McGraw-Hill Book Company, Inc. New York.

Sinnott, E.W. & L.C. Dunn. 1925. Principles of Genetics. McGraw-Hill Book Company, Inc. London.

Small, J.K. 1933. Manual of the Southeastern Flora. University of North Carolina Press. Chapel Hill.

Smith, G.M. et al. 1929. A Textbook of General Botany: revised edition. The Macmillan Company. New York.

Soderstrom, T.R. et al. eds. 1987. Grass Systematics and Evolution. Smithsonian Institution Press. Washington D.C.

Sporne, K.R. 1956. The Phylogenetic Classification of the Angiosperms. Cambridge University Press. Cambridge.

Stafleu, F.A. 1972. International Code of Botanical Nomenclature. A. Oosthoek's Uitgeversmaatschappij N.V. Utrecht, Netherlands.

Standley, P.C. 1921. Flora of Glacier National Park, Montana. Government Printing Office. Washington, D.C.

Standley, P.C. 1926. Plants of Glacier National Park. Government Printing Office. Washington, D.C.

Stevenson, T.V. 1976. Historic Hahns Peak. Robinson Press, Inc. Fort Collins.

Swingle, D.B. 1928. A Textbook of Systematic Botany. 1st Edition. McGraw-Hill Book Company, Inc. New York & London.

Swingle, D.B. 1946. A Textbook of Systematic Botany. 3rd Edition. McGraw-Hill Book Company, Inc. New York & London.

Tanaka, I. & S. Iwadare. 1931. Edible Wild Plants of Hokkaido, Japan. Hokkaido Agricultural Experiment Station. Japan.

Tatewaki, M. 1946. One Hundred Edible Wild Plants, Part I. Hoppo-Shuppansha. Japan.

Tatewaki, M. 1946. One Hundred Edible Wild Plants, Part II. Hoppo-Shuppansha. Japan.

Tehon, L.R. 1942. Fieldbook of Native Illinois Shrubs. Natural History Survey Division. Urbana.

Thornton, B.J. & H.D. Harrington. 19(?) Weeds of Colorado. Agricultural Experiment Station, Colorado State University. Fort Collins.

Tidestrom, I. 1925. Flora of Utah and Nevada. Washington Government Printing Office. Washington, D.C.

Tiedeman, J.A. & C. Terwilliger, Jr. 1978. Phyto-Edaphic Classification of the Piceance Basin. Colorado State University Range Science Department. Fort Collins.

Tochinai, Y. 1945. Seven Edible Herbs. Seikatsu-Sha. Japan.

Transeau, E.N. 1924. General Botany. World Book Company. Yonkers-on-Hudson, NY.

Trelease, W. 1921. Plant Materials of Decorative Gardening: The Woody Plants. 2nd Edition. Flanigan-Pearson Co. Champaign.

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