References


Ames, O. (1921) "Notes on New England orchids. I. Spiranthes." Rhodora, 23, pp. 3-85.

Anderson, Gregory J., & James D. Hill (2002) "Many to flower, few to fruit: the reproductive biology of Hamamelis virginiana (Hamamelidaceae)." American Journal of Botany, 89(1), pp. 67-78.

Anderson, Roger C., & Michael H. Beare (1983) "Breeding system and pollination ecology of Trientalis borealis (Primulaceae)." American Journal of Botany, 70, pp. 408-415.

Arnold, Robert M. (1982) "Pollination, predation, and seed set in Linaria vulgaris (Scrophulariaceae)." American Midland Naturalist, 107(2), pp. 360-369.

Aspinwall, N., & T. Christian (1992) "Pollination biology, seed production, and population structure in Queen-of-the-Prairie, Filipendula rubra (Rosaceae) at Bottom Fen, Missouri." American Journal of Botany, 79(8), pp. 488-494.

Barrett, S., & K. Helenurm (1987) "The reproductive biology of forest herbs: 1. Breeding systems and pollination." Canadian Journal of Botany, 65(10), pp. 2036-2046.

Baskin, Carol C., Jerry M. Baskin, & Elsie Quarterman (1972) "Observations on the ecology of Astragalus tennesseenis." American Midland Naturalist, 88(1), pp. 167-182.

Bernhardt, P. (1990) "Anthecology of Schrankia nuttallii (Mimosaceae) on the tallgrass prairie." Plant Systematics and Evolution, 170, pp. 247-255.

Bernhardt, P. (1990) "Pollination ecology of Oxalis violacea (Oxalidaceae) following a controlled fire." Plant Systematics and Evolution, 171, pp. 147-155.

Bertin, Robert I. (1982) "Floral biology, hummingbird pollination, and fruit production of Trumpet Creeper (Campsis radicans, Bignoniaceae)." American Journal of Botany, 69(1), pp. 122-134.

Bertin, Robert I. (1982) "The ruby-throated hummingbird and its major food plants, ranges, flowering phenology, and migration." Canadian Journal of Zoology, 60, pp. 210-219.

Betz, Robert F., Ray D. Struven, James E. Will, & Francis B. Heitler (1994) "Insect pollinators: 12 milkweed species." Proceedings of the 13th North American Prairie Conference, pp. 45-60.

Bock, Jane H., & Steven J. Peterson (1975) "Reproductive biology of Pulsatilla patens (Ranunculaceae)." American Midland Naturalist, 94(2), pp. 476-478.

Bouseman, John, & James Sternburg (2001) Field Guide to Butterflies of Illinois, Manual 9. Illinois Natural History Survey: Champaign, IL.

Bouseman, John, James Sternburg, & James Wiker (2006) Field Guide to the Skipper Butterflies of Illinois, Manual 11. Illinois Natural History Survey: Champaign, IL.

Broyles, S.B., & R. Wyatt (1991) "Effective pollen dispersal in a natural population of Asclepias exaltata: the influence of pollinator behavior, genetic similarity, and mating success." American Naturalist, 138, pp. 1239-1249.

Campbell, Diane R. (1985) "Pollinator sharing and seed set of Stellaria pubera: field experiments on competition for pollination." Ecology, 66, pp. 544-553.

Cane, James H., George C. Eickwort, F. Robert Wesley, & Joan Spielholz (1985) "Pollination ecology of Vaccinium stamineum (Ericaceae: Vaccinioideae)." American Journal of Botany, 72(1), pp. 135-142.

Cane, James H., & Daniel Schiffhauser (2003) "Dose-response relationships between pollination and fruiting refine pollinator comparisons for cranberry (Vaccinium macrocarpon, Ericaceae)." American Journal of Botany, 90, pp. 1425-1437.

Catling, P.M. (1983) "Pollination of northeastern North American Spiranthes (Orchidaceae)." Canadian Journal of Botany, 61, 1080-1093.

Catling, P.M., & G. Knerer (1980) "Pollination of the small white lady's-slipper (Cypripedium candidum) in Lambton County, southern Ontario." Canadian Field Naturalist, 94, pp. 435-438.

Cingela, Nelis (2001) An Atlas of Orchid Pollination: America, Africa, Asia, and Australia, CRC Press, 296 pp.

Clinebell II, Richard R. (2003) "Foraging ecology of selected prairie wildflowers (Echinacea, Liatris, Monarda, and Veronicastrum) in Missouri prairie remnants and restorations." Proceedings of the 18th North American Prairie Conference, pp. 194-212. Kirksville, MO: Truman State Univ. Press.

Clinebell II, R.R., & P. Bernhardt (1998) "The pollination ecology of five species of Penstemon (Scrophulariaceae) in the tallgrass prairie." Annals of the Missouri Botanical Garden, 85(1), pp. 126-136.

Cole, F. Russell (1988) "Reproductive success and inflorescence size of Calopogon tuberosus (Orchidaceae)." American Journal of Botany, 75(9), pp. 1371-1377.

Conger, Allen C. (1912) "Some entomophilous flowers of Cedar Point, Ohio." The Ohio Naturalist, 12(6), pp. 500-505.

Costelloe, Barbara H. (1988) "Pollination ecology of Gentiana andrewsii." Ohio Journal of Science, 88(4), pp. 132-138.

Covell, Charles Jr. (1984) Peterson Field Guide to Eastern Moths. Houghton Mifflin: New York.

Crosswhite, F.S., & C.D. Crosswhite (1966) "Insect pollinators of Penstemon series Graciles (Scrophulariaceae) with notes on Osmia and other Megachilidae." American Midland Naturalist, 76, pp. 450-467.

Daly, H.V. (1961) "Biological observations on Hemihalictus lustrans, with a description of the larvae (Hymenoptera: Halictidae)." Journal of the Kansas Entomological Society, 34, pp. 134-141.

Davis, R.W. (1986) "The pollination biology of Cypripedium acaule (Orchidaceae)." Rhodora, 88, pp. 445-450.

Dieringer, Gregg (1982) "The pollination ecology of Orchis spectabilis (Orchidaceae)." Ohio Journal of Science, 82, 218-225.

Estes, James R., & Robbin W. Thorp (1974) "Pollination in Ludwigia peploides ssp. glabrescens (Onagraceae)." Bulletin of the Torrey Botanical Club, 101(5), pp. 272-276.

Estes, James R., & Robbin W. Thorp (1975) "Pollination ecology of Pyrrhopappus carolinianus (Compositae)." American Journal of Botany, 62(2), pp. 148-159.

Evans, Francis C. (1986) "Bee-flower interactions on an old field in southeastern Michigan." Proceedings of the 9th North American Prairie Conference, pp. 103-109.

Fleming, R.C. (1970) "Food plants of some adult sphinx moths (Lepidoptera: Sphingidae)." Michigan Entomology, 3, pp. 17-23.

Fothergill, K., & A. Vaughn (2010) "Butterfly nectar plants at Big Oak Tree State Park and Towosaghy State Historic Site, Mississippi County, Missouri." Midsouth Entomologist, 3(1), pp. 33-38.

Godfery, M.J. (1933) Native British Orchidaceae. Cambridge: Cambridge University Press.

Graenicher, S. (1900) "The fertilization and insect visitors of our earliest entomophilous flowers." Bulletin of the Wisconsin Natural History Society, 1, pp. 73-84.

Graenicher, S. (1900) "The fertilization of Symphoricarpos and Lonicera." Bulletin of the Wisconsin Natural History Society, 1, pp. 141-156.

Graenicher, S. (1900) "The Syrphidae of Milwaukee County." Bulletin of the Wisconsin Natural History Society, 1, pp. 167-177.

Graenicher, S. (1902) "Flowers adapted to flesh-flies." Bulletin of the Wisconsin Natural History Society, 2, pp. 29-38.

Graenicher, S. (1906) "Some notes on the pollination of flowers." Bulletin of the Wisconsin Natural History Society, 4, pp. 12-21.

Graenicher, S. (1907) "Wisconsin flowers and their pollination." Part I. Bulletin of the Wisconsin Natural History Society, 5, pp. 15-45.

Graenicher, S. (1907) "Wisconsin flowers and their pollination." Part II. Bulletin of the Wisconsin Natural History Society, 5, pp. 84-95.

Graenicher, S. (1909) "Wisconsin flowers and their pollination." Compositae, Part I. Bulletin of the Wisconsin Natural History Society, 7, pp. 19-77.

Graenicher, S. (1909) "The bee flies (Bombyliidae) in the their relations to flowers." Bulletin of the Wisconsin Natural History Society, 8, pp. 91-101.

Graenicher, S. (1909) "On hummingbird flowers." Bulletin of the Wisconsin Natural History Society, 8, pp. 183-186.

Groman, Joshua D., & Olle Pellmyr (1999) "The pollination biology of Manfreda virginica (Agavaceae): relative contribution of diurnal and nocturnal visitors." OIKOS, 87(2), pp. 373-381.

Grundel, Ralph, & Noel B. Pavlovic (2000) "Nectar plant selection by the Karner Blue butterfly (Lycaeides melissa samuelis) at the Indiana Dunes National Lakeshore." American Midland Naturalist, 144(1), pp. 1-10.

Guignard, J.A. (1886) "Insects & orchids." 16th Annual Report of the Entomological Society of Ontario, 16, 39-48.

Haddock, Randall C., & Chaplin, Stephen J. (1982) "Pollination and seed production in two phenologically divergent prairie legumes (Baptisia leucophaea & Baptisia leucantha)." American Midland Naturalist, 108(1), pp. 175-186.

Hannan, Gary L., & Hewlett A. Prucher (1996) "Reproductive biology of Caulophyllum thalictroides (Berberidaceae), an early flowering perennial of eastern North America." American Midland Naturalist, 136, pp. 267-277.

Hapeman, Jeffrey R. (1997) "Pollination and floral biology of Platanthera peramoena (Orchidaceae)." Lindleyana, 12(1), pp. 19-25.

Herms, C.P. (1996) "The endangered Karner Blue butterfly (Lepidoptera: Lycaenidae) in Michigan: habitat suitability, potential impacts of Gypsy moth (Lepidoptera: Lymantriidae) suppression, and laboratory rearing." M.S. Thesis, Michigan State Univ., East Lansing, Michigan.

Heshka, Lorne (2000) "Pollinators of the Western Prairie Fringed Orchid: a Manitoba research project." North American Native Orchid Journal, 6(4), pp. 251-261.

Hicks, D.J., R. Wyatt, & T.R. Meacher (1985) "Reproductive biology of distylous partridge berry, Mitchella repens." American Journal of Botany, 72(10), pp. 1503-1514.

Hilton Pond Center for Piedmont Natural History (2008) at: http://www.hiltonpond.org/ThisWeek04522.html

Hoffman, Joyce, & Brenda Molano-Flores (2004) "Site spotlight: Bonnie's Prairie Nature Preserve." A Prairie Rendezvous, 7(1), pp. 6-8.

Hogan, K.P. (1983) "The pollination biology and breeding system of Aplectrum hyemale (Orchidaceae)." Canadian Journal of Botany, 61, pp. 1906-1910.

Iltis, Hugh H. (1963) "Napaea dioica (Malvaceae): Whence came the type?" American Midland Naturalist, 70(1), pp. 90-109.

Keddy, C.J., & P.A. Keddy (1983) "Reproductive biology and habitat of Cirsium pitcheri." The Michigan Botanist, 23, pp. 57-67.

Knab, Frederick (1907) "Mosquitos as flower visitors." Journal of the New York Entomological Society, 15, pp. 215-219.

Krannitz, Pam G., & M.A. Maun (1991) "Insect visitors to the Guelder Rose, Viburnum opulus var. opulus (Caprifoliaceae) in London, Ontario." Canadian Field Naturalist, 105(1), pp. 13-17.

Krombein, Karl V., Paul D. Hurd Jr., David B. Smith, & B.D. Burks (1979) Catalog of Hymenoptera in America North of Mexico, Vol. 2. Smithonian Institute Press, Washington, D.C.

LaBerge, Walter E. (1956) "A revision of the bees of the genus Melissodes in North and Central America," Part I. The University of Kansas Science Bulletin, 37(2), pp. 911-1183.

Larson, Brendon, & Spencer Barrett (1999) "The pollination ecology of buzz-pollinated Rhexia virginica (Melastomataceae)." American Journal of Botany, 86(4), pp. 502-511.

Lewis, Alcinda C. (1989) "Flower visit consistency in Pieris rapae, the cabbage butterfly." Journal of Animal Ecology, 58(1), pp. 1-13.

Lindsey, Anne H. (1984) "Reproductive biology of Apiaceae. I. Floral visitors to Thaspium and Zizia and their importance in pollination." American Journal of Botany, 71(3), pp. 375-387.

Lisberg, Anneke E., & Daniel K. Young (2003) "An annotated checklist of Wisconsin Mordellidae (Coleoptera)." Insecta Mundi, 17, pp. 195-202.

Little, Karen J., Gregg Dieringer, & Michael Romano (2005) "Pollination ecology, genetic diversity and selection on nectar spur length in Platanthera lacera (Orchidaceae)." Plant Species Biology, 20, pp. 183-190.

Luer, C.A. (1975) The Native Orchids of the United States and Canada excluding Florida. New York: New York Botanical Garden.

Macior, Lazarus Walter. (1964) "An experimental study of the floral ecology of Dodecatheon meadia." American Journal of Botany, 51, pp. 96-108.

Macior, L.W. (1966) "Foraging behavior of Bombus (Hymenoptera: Apidae) in relation to Aquilegia pollination." American Journal of Botany, 53, pp. 302-309.

Macior, L.W. (1967) "Pollen-foraging behavior of Bombus in relation to pollination of nototribic flowers." American Journal of Botany, 54, pp. 359-364.

Macior, L.W. (1968) "Pollination adaptation in Pedicularis canadensis." American Journal of Botany, 55, pp. 1031-1035.

Macior, L.W. (1969) "Pollination adaptation in Pedicularis lanceolata." American Journal of Botany, 56, pp. 853-859.

Macior, L.W. (1970) "The pollination ecology of Dicentra cucullaria." American Journal of Botany, 57, pp. 6-11

Macior, L.W. (1975) "The pollination ecology of Delphinium tricorne (Ranunculaceae)." American Journal of Botany, 62, pp. 1009-1016.

MacRae, Ted C. (1991) "Buprestidae (Coleoptera) of Missouri." Insecta Mu
ndi, Univ. of Nebraska at Lincoln.

Mawdsley, Jonathan R. (2002) "Ecological notes on species of Cleridae (Insecta: Coleoptera) associated with the prairie flora of central North America." Great Lakes Entomologist, 35(1), pp. 15-22.

McKone, M.J., R. Ostertag, J.T. Rauscher, D.A. Heiser, & F.L. Russell (1995) "An exception to Darwin's syndrome: floral position, protogyny, and insect visitation in Besseya bullii (Scrophulariaceae)." Oecologia, 101, pp. 68-74.

McLain, D. Kelly (1983) "Ants, extrafloral nectaries, and herbivory on the passion vine, Passiflora incarnata." American Midland Naturalist, 110(2), pp. 433-439.

Mehrhoff, L.A. (1983) "Pollination in the genus Isotria (Orchidaceae)." American Journal of Botany, 70(10), pp. 1444-1453.

Michener, Charles D., & Carl W. Rettenmeyer (1956) "The ethology of Andrena erythronii with comparative data on other species." ?

Mitchell, R.J., J.D. Karron, K.G. Holmquist, & J.M. Bell (2004) "The influence of Mimulus ringens floral display size on pollinator visitation pattern." Functional Ecology, 18, 116-124.

Mitchell, Theodore B. (1960/1962) Bees of the Eastern United States, Vol. I-II. Technical Bulletins No. 141 & 152, North Carolina Experiment Station.

Moddy-Weis, Jennifer M., & J.S. Heywood (2001) "Pollination limitation to reproductive success in the Missouri evening primrose, Oenothera macrocarpa (Onagraceae)." American Journal of Botany, 88(9), pp. 1615-1622.

Mohlenbrock, Robert H. (1986) Guide to the Vascular Plants of Illinois, Rev. Ed. Southern Illinois Univ. Press: Carbondale & Edwardsville, IL.

Motten, A.F. (1982) "Autogamy and competition for pollinators in Hepatica americana (Ranunculaceae)." American Journal of Botany, 69, pp. 1296-1305.

Motten, A.F. (1986) "Pollination ecology of the spring wildflower-community of a temperate deciduous forest." Ecological Monographs, 56, pp. 21-42.

Moure, Jesus S., & Paul D. Hurd, Jr. (1987) An Annotated Catalog of the Halictid Bees of the Western Hemisphere (Hymenoptera: Halictidae). Smithsonian Institution Press: Washington, D. C.

Ne'eman, Gidi, Rina Ne'eman, & Aaron M. Ellison (2006) "Limits to reproductive success of Sarracenia purpurea (Sarraceniaceae)." American Journal of Botany, 93, pp. 1660-1666.

Opler, Paul A., & Vichai Malikul (1992/1998) Peterson Field Guide to Eastern Butterflies. Houghton Mifflin: New York.

Osborn, J.M., & E.L. Schneider (1988) "Morphological studies of the Nymphaeaceae sensu lato. XVI. The floral biology of Brasenia schreberi." Annals of the Missouri Botanical Garden, 75, pp. 778-794.

Ott, James R. (1991) "The biology of Acanthoscelides alboscutellatus (Coleoptera: Bruchidae) on its host plant, Ludwigia alternifolia (L.) (Onagraceae)." Proceedings of the Entomological Society of Washington, 93, pp. 641-651.

Patt, J.M., J.C. French, C. Schal, J. Lech, & T.G. Hartman (1995) "The pollination biology of tuckahoe, Peltandra virginica (Araceae)." American Journal of Botany, 82, pp. 1230-1240.

Petersen, Chris E. (1996) "Bee visitors of four reconstructed tallgrass prairies in Northeastern Illinois." Proceedings of the 15th North American Prairie Conference, pp. 200-206.

Plowright, R.C., J.D. Thomson, & G.R. Thaler (1980) "Pollen removal in Cypripedium acaule (Orchidaceae) in relation to aerial fenithrothion spraying in New Brunswick." Canadian Entomologist, 112(8), pp. 765-770.

Quesada-Aguilar, Andrea, Susan Kalisz, & Tia-Lynn Ashman (2008) "Flower morphology and pollinator dynamics in Solanum carolinense (Solanaceae): implications for the evolution of andromonoecy." American Journal of Botany, 95(8), pp. 974-984.

Ramsey, C.T. (1966) "Our two purple-fringed orchids." Bulletin of the American Orchid Society, 35(6), pp. 458-460.

Reader, R.J. (1975) "Competitive relationships of some bog ericads for major insect pollinators." Canadian Journal of Botany, 53, pp. 1300-1305.

Reader, R.J. (1977) "Bog ericad flowers: self-compatibility and relative attractiveness to bees." Canadian Journal of Botany, 55, pp. 2279-2287.

Reed, Catherine C. (1993) "Reconstruction of pollinator communities on restored prairies in eastern Minnesota." Final Report to the Nongame Wildlife Program, Minnesota Dept. of Natural Resources.

Reed, Catherine C. (1995) "Species richness of insects on prairie flowers in southeastern Minnesota." Proceedings of the 14th North American Prairie Conference, pp. 103-115.

Robertson, Charles (1893) "Flowers and insects." Botanical Gazette, 18, 47-54.

Robertson, Charles (1929) Flowers and Insects. The Science Press: Lancaster, PA.

Schemske, D.W., M.F. Willson, M.N. Melampy, L.J. Miller, L. Verner, K.M. Schemske, and L.B. Best (1978) "Flowering ecology of some spring woodland herbs." Ecology, 59, pp. 351-366.

Schneider, E.L., & J.M. Jeter (1982) "Morphological studies of the Nymphaeaceae. XII. The floral biology of Cabomba caroliniana." American Journal of Botany, 69, pp. 1410-1419.

Schoen, Daniel J. (1977) "Floral biology of Diervilla lonicera (Caprifoliaceae)." Bulletin of the Torrey Botanical Club, 104(3), pp. 234-240.

Sheviak, C.J., & M.L. Bowles (1986) "The prairie-fringed orchids: a pollinator-isolated pair." Rhodora, 88, pp. 267-290.

Small, E. (1976) "Insect pollinators of the Mer Bleue peat bog of Ottawa." Canadian Field Naturalist, 90, pp. 22-28.

Smith, Gordon R., & G.E. Snow (1976) "Pollination ecology of Platanthera (Habenaria) ciliaris and P. blephariglottis (Orchidaceae)." Botanical Gazette, 137(2), pp. 133-140.

Spira, T. (1989) "Reproductive biology of Hibiscus moscheutos (Malvaceae)." In J.H. Brock & Y.B. Linhart (Eds.) The Evolutionary Ecology of Plants, pp. 247-255. Boulder, CO: Westview Pr.

Standley, L., S.S. Kim, and I.M. Hjersted (1988) "Reproductive biology of two sympatric species of Chimaphila." Rhodora, 90, pp. 233-244.

Stephenson, Andrew G. (1981) "Toxic nectar deters nectar thieves of Catalpa speciosa." American Midland Naturalist, 105(2), pp. 381-383.

Stephenson, Andrew G., & W.W. Thomas (1977) "Diurnal and nocturnal pollination of Catalpa speciosa (Bignoniaceae)." See Stephenson (1981) above for the complete reference.

Stoutamire, W.P. (1967) "Flower biology of the Lady's-slippers." Michigan Botanist, 6(4), pp. 159-175.

Stoutamire, W.P. (1974) "Relationships of the purple-fringed orchids Platanthera psychodes and Platanthera grandiflora." Brittonia, 26, pp. 42-58.

Stucky, Jon M. (1984) "Forager attraction by sympatric Ipomoea hederacea and I. purpurea (Convolvulaceae) and corresponding forager behavior and energetics." American Journal of Botany, 71(9), pp. 1237-1244.

Swengel, Ann B., & Scott R. Swengel (2000) "Observations on Lycaeides in the northern Midwest, USA (Lepidoptera: Lycaenidae)." Holarctic Lepidoptera, 7(1), pp. 21-31.

Thien, Leonard B. (1969) "Mosquito pollination of Habenaria obtusata (Orchidaceae)." American Journal of Botany, 56(2), pp. 232-237.

Thien, Leonard B., & Brian G. Marcks (1972) "The floral biology of Arethusa bulbosa, Calopogon tuberosus, and Pogonia ophioglossoides (Orchidaceae)." Canadian Journal of Botany, 50, 2319-2325.

Thien, L.B., & F. Utech (1970) "The mode of pollination in Habenaria obtusata (Orchidaceae). American Journal of Botany, 57(9), pp. 1031-1035.

Thieret, John W. (1976) "Floral biology of Proboscidea louisianica (Martyniaceae)." Rhodora, 78, pp. 169-179.

Thomson, J.D., W.P. Maddison, & R.C. Plowright (1982) "Behavior of bumblebee pollinators of Aralia hispida Vent. (Araliaceae)." Oecologia, 54, pp. 326-336.

Todd, Brent L., Henry R. Owen, & Janice M. Coons (2002) "Pollen comparison from insect visitors to Stylisma pickeringii (Convolvulaceae), an endangered plant of Illinois sand prairies." Manuscript, Eastern Illinois University, at: http://www.eiu.edu/~biodata/2002/poster_005.htm

Trelease, William (1881) "Notes on the perforation of flowers." Bulletin of the Torrey Botanical Club, 8, pp. 68-69.

Voss, E.G., & R.E. Riefner Jr. (1983) "A pyralid moth as pollinator of blunt-leaf orchid." The Great Lakes Entomologist, 16, pp. 57-60.

Wesselingh, R.A., & M.L. Arnold (2000) "Pollinator behavior and the evolution of Louisiana iris hybrid zones." Journal of Evolutionary Biology, 13(2), pp. 171-180.

Whigham, Dennis F., & M. McWethy (1980) "Studies on the pollination ecology of Tipularia discolor (Orchidaceae)." American Journal of Botany, 67(4), pp. 550-535.

Wiggam, Shelly, & Carolyn J. Ferguson (2005) "Pollinator importance and temporal variation in a population of Phlox divaricata L. (Polemoniaceae)." American Midland Naturalist, 154, pp. 42-54.

Williams, Andrew H. (1998) "Arthropod fauna using Marbleseed in Wisconsin." Proceedings of the 16th North American Prairie Conference, pp. 165-171.

Williams, S.A. (1994) "Observations on reproduction in Triphora trianthophora (Orchidaceae)." Rhodora, 96, pp. 30-43.

Willson, Mary F., & Robert I. Bertin (1979) "Nectar production and flower visitors of Asclepias verticillata." American Midland Naturalist, 102(1), pp. 23-35.

Wisconsin Orchids (2008) by Jeffrey R. Hapeman at:
http://www.botany.wisc.edu/orchids/Orchids_of_Wisconsin.html

Wist, Tyler J. (2005) "Pollination biology of Echinacea angustifolia and Echinacea purpurea (Asteraceae) in Saskatchewan." M.S. Thesis, University of Saskatchewan, Canada.

Wyatt, R., & R.L. Hellwig (1979) "Factors determining fruit-set in heterostylous bluets, Houstonia caerulea (Rubiaceae)." Systematic Botany, 4, pp. 103-114.


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