Abstract
Differences in the numbers of stamens and styles per flower are conspicuous features of variation in North American hawthorns (Crataegus L.). Variation in stamen number between individuals is discontinuous, with modes of approximately 20 and 10 (or fewer). In North American black-fruited sectionDouglasii Loudon the 10-stamen morphotype is exclusively polyploid, whereas the 20-stamen morphotype comprises both diploids and polyploids. Polyploidy is associated with apospory, self-fertility, and varying degrees of pollen sterility. Variation in stamen number may also be correlated with variation in distribution, phenology, leaf shape, and other features of floral morphology, leading to recognition of taxa at the specific or infraspecific level. Comparable variation in stamen number is virtually unknown in Eurasian hawthorns, as in the majority of flowering plants. In sectionDouglasii stamen number morphotypes have been recognized as either varieties or species; although correlations between stamen number and other features are not as straightforward as was previously surmised, the higher rank appears to be appropriate. These data on breeding system and morphological variation may be explainable in terms of hypotheses linking gametophytic apomixis, polyploidization, and optimal strategies for pollen dispersal.
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References
Alexander M.P. (1969): Differential staining of aborted and non-aborted pollen.Stain Technol. 44: 117–122.
Bachmann K.K. (1983): Evolutionary genetics and the genetic control of morphogenesis in flowering plants. In:Hecht M.K., Wallace B. &Prance G.T. (eds.),Evolutionary Biology, Plenum Publishing Corp., New York, pp. 157–208.
Bachmann K.K., Chambers K.L. &Price H.J. (1980): Genetic polymorphisms for canalized morphological characters are ubiquitous inMicroseris (Asteraceae: Lactucaceae). In:2nd International Congress of Systematic and Evolutionary Biology (Abstracts of contributed papers), University of British Columbia, Vancouver BC, p. 411.
Baldwin W.K.W. (1958): Plants of the Clay Belt of northern Ontario and Qubec.Bull. Natl. Mus. Canada 156.
Bradshaw A.D. (1971): The significance of hawthorns. In: Standing Committee for Local History (ed.),Hedges and local history, National Council of Social Service, London, pp. 20–29.
Brouillet L. &Whetstone R.D. (1993): 1. Climate and physiography. In: Flora of North America Editorial Committee (ed.),Flora of North America north of Mexico 1, Oxford University Press, New York, pp. 15–46.
Brunsfeld S.J. &Johnson F.D. (1990): Cytological, morphological, ecological and phenological support for specific status ofCrataegus suksdorfii (Sarg.) Kruschke.Madroño 37: 274–282.
Campbell C.S. &Dickinson T.A. (1990): Apomixis, patterns of morphological variation, and species concepts in subfamilyMaloideae (Rosaceae).Syst. Bot. 15: 124–135.
Campbell C.S., Greene C.W. &Dickinson T.A. (1991): Reproductive biology in subf.Maloideae (Rosaceae).Syst. Bot. 16: 333–349.
Charnov E.L. (1982):The theory of sex allocation. Princeton University Press, Princeton.
Christensen K.I. (1992): Revision ofCrataegus sect.Crataegus and nothosect.Crataeguineae (Rosaceae-Maloideae) in the old world.Syst. Bot. Monogr. 35: 1–199.
Cruden R.W. (1977): Pollen-ovule ratios: a conservative indicator of breeding systems in flowering plants.Evolution 31: 32–46.
Cruden R.W. &Miller-Ward S. (1981): Pollen-ovule ratio, pollen size, and the ratio of stigmatic area to the pollen-bearing area of the pollinator: an hypothesis.Evolution 35: 964–974.
Curtis A.B. (1986):Upper Elk meadows research natural area. USDA, Forest Service, Pacific Northwest Forest and Range experiment Station, Portland.
Denton G.H. &Hughes T.J. (eds.) (1981):The last great ice sheets. Wiley-Interscience Publications, John Wiley & Sons, New York.
Dickinson T.A. (1985): Biology of Canadian weeds. 68.Crataegus crus-galli L. sensu lato.Canad. J. Pl. Sci. 65: 641–654.
Dickinson T.A. &Campbell C.S. (1991): Population structure and reproductive ecology in theMaloideae (Rosaceae).Syst. Bot. 16: 350–362.
Dickinson T.A. & Love R.M. (in press): What IS Douglas hawthorn? In:Kaye T.N. (ed.),Conservation and management of native plants and fungi, Native Plant Society of oregon, Corvallis.
Dickinson T.A. &Phipps J.B. (1985): Studies inCrataegus L. (Rosaceae: Maloideae) XIII. Degree and pattern of variation inCrataegus sectionCrus-galli in Ontario.Syst. Bot. 10: 322–337.
Dickinson T.A. &Phipps J.B. (1986): Studies inCrataegus L. (Rosaceae: Maloideae) XIV. The breeding system ofCrataegus crus-galli sensu lato in Ontario.Amer. J. Bot. 73: 116–130.
Eggleston W.W. (1908): TheCrataegi of the northeastern United States and adjacent Canada.Rhodora 10: 73–84.
Ellstrand N.C. (1983): Floral formula inconstancy within and among plants and populations ofIpomopsis aggregata (Polemoniaceae).Bot. Gaz. 144: 119–123.
Evans R.C. (1994):Floral development of 10- and 20-stamen morphotypes of Crataegussection Douglasii. M.Sc. Thesis, University of Toronto, Toronto.
Evans R.C. &Dickinson T.A. (1996): North American black-fruited hawthorns: II. Floral development of 10- and 20-stamen morphotypes ofCrataegus sectionDouglasiiLoud.Amer. J. Bot. 83: 961–978.
Fernald M.L. (1935): Critical plants of the upper Great Lakes region of Ontario and Michigan.Rhodora 37: 197–222 (Plates 352–355), 238–262 (Plates 356–362), 272–301 (Plates 363–375), 324–341 (Plates 376–379).
Gallardo R., Dominguez E. &Muñoz J.M. (1994): Pollen-ovule ratio, pollen size, and breeding system inAstragalus (Fabaceae) subgenusEpiglottis: a pollen and seed allocation approach.Amer. J. Bot. 81: 1611–1619.
Guitian J. &Fuentes M. (1992): Reproductive ecology ofCrataegus monogyna in northwestern Spain.Acta Oecol. 13: 3–11.
Harder L.D. &Thomson J.D. (1989): Evolutionary options for maximizing pollen dispersal of animal-pollinated plants.Amer. Naturalist 133: 323–344.
Harlan J.R. &de Wet J.M.J. (1975): On Ö. Winge and a prayer.Bot. Rev. (Lancaster) 41: 361–390.
Herr J.M., Jr. (1971): A new clearing-squash technique for the study of ovule development in angiosperms.Amer. J. Bot. 58: 785–790.
Herr J.M., Jr. (1995): The origin of the ovule.Amer. J. Bot. 82: 547–564.
Hickman J.C. (ed.) (1993):The Jepson Manual—higher plants of California. University of California Press, Berkeley.
Huston M.A. (1994):Biological diversity—the coexistence of species on changing landscapes. Cambridge University Press, Cambridge.
Klotz G. (1967): Numerische Taxonomie und moderne Verwandschaftsforschung.Feddes Repert. 75: 115–130.
Kruschke E.P. (1965):Contributions to the taxonomy of Crataegus. Milwaukee Public Museum, Milwaukee.
Legendre L. &Legendre P. (1983):Numerical ecology. Elsevier Scientific Publishing Company, Amsterdam.
Lewis W.H. (1980): Polyploidy in species populations. In:Lewis W.H. (ed.),Polyploidy— biological relevance, Plenum Press, New York.
Love R. &Feigen M. (1978): Interspecific hybridization between native and naturalizedCrataegus (Rosaceae) in western Oregon.Madroño 25: 211–217.
Maher R.V., Argus G.W., Harms V.L. & Hudson J.H. (1979): The rare vascular plants of Saskatchewan.Syllogeus 20.
Marquis R.J. &Voss E.G. (1981): Distributions of some western North American plants disjunct in the Great Lakes region.Michigan Bot. 20: 53–82.
Marshall D.R. &Brown A.H.D. (1981): The evolution of apomixis.Heredity 47: 1–15.
McAndrews J.H., Liu K.-B., Manville G.C., Prest V.K. &Vincent J.S. (1987): Plate 4—Environmental change after 9000 BC. In:Harris R.C. &Matthews G.J. (eds.),Historical Atlas of Canada—From the beginning to 1800, University of Toronto Press, Toronto.
Mogie M. (1992):The evolution of asexual reproduction in plants. Chapman & Hall, London.
Morton J.K. &Hogg E.H. (1989): Biogeography of island floras in the Great Lakes. II. Plant dispersal.Canad. J. Bot. 67: 1803–1820.
Muniyamma M. &Phipps J.B. (1979a): [Studies inCrataegus (Rosaceae: Maloideae).I.] Cytological proof of apomixis inCrataegus (Rosaceae).Amer. J. Bot. 66: 149–155.
Muniyamma M. &Phipps J.B. (1979b): [Studies inCrataegus (Rosaceae: Maloideae). II.] Meiosis and polyploidy in Ontario species ofCrataegus in relation to their systematics.Canad. J. Genet. Cytol. 21: 231–241.
Muniyamma M. &Phipps J.B. (1984): Studies inCrataegus XI. Further cytological evidence for the occurrence of apomixis in North American hawthorns.Canad. J. Bot. 62: 2316–2324.
Muniyamma M. &Phipps J.B. (1985): Studies inCrataegus XII. Cytological evidence for sexuality in some diploid and tetraploid species of North American hawthorns.Canad. J. Bot. 63: 1319–1324.
Phipps J.B. &Muniyamma M. (1980): [Studies inCrataegus (Rosaceae: Maloideae) III.] A taxonomic revision ofCrataegus (Rosaceae) in Ontario.Canad. J. Bot. 58: 1621–1699.
Phipps J.B., Robertson K.R., Smith P.G. &Rohrer J.R. (1990): A checklist of the subfamilyMaloideae (Rosaceae).Canad. J. Bot. 68: 2209–2269.
Pimentel R.A. (1979):Morphometrics—the multivariate analysis of biological data. Kendall-Hunt Publishing Co., Dubuque.
Ptak K. (1986): Cyto-embryological investigations on the Polish representatives of the genusCrataegus L. I. Chromosome numbers; embryology of diploid and tetraploid species.Acta Biol. Cracov., Ser. Bot. 28: 107–122.
Ptak K. (1989): Cyto-embryological investigations on the Polish representatives of the genusCrataegus L. II. Embryology of triploid species.Acta Biol. Cracov., Ser. Bot. 31: 97–112, Pl. 5.
Rickett H.W. (1936): Forms ofCrataegus pruinosa.Bot. Gaz. 97: 780–793.
Rickett H.W. (1937): Forms ofCrataegus crus-galli.Bot. Gaz. 98: 609–616.
Robertson K.R. (1974): The genera ofRosaceae in the southeastern United States.J. Arnold Arbor. 55: 303–332, 344–401, 611–662.
Rohlf F.J. (1993):NTSYS-pc. Version 1.80. Exeter Software, Ltd., Setauket.
Smith, P.G. &Phipps J.B. (1988): Studies inCrataegus (Rosaceae, Maloideae), XIX. Breeding behavior in OntarioCrataegus seriesRotundifoliae.Canad. J. Bot. 66: 1914–1923.
Smith P.G., Phipps J.B. &Dickinson T.A. (1980): Accumulated heat in relation toCrataegus flowering. In:2nd International Congress of Systematic and Evolutionary Biology (Abstracts of contributed papers), University of British Columbia, Vancouver, p. 353.
Sokal R.R. &Rohlf F.J. (1973):Introduction to biostatistics. W.H. Freeman, San Francisco.
Soltis P.S., Doyle J.J. &Soltis D.E. (1992): Molecular data and polyploid evolution in plants. In:Soltis P.S., Soltis D.E. &Doyle J.J. (eds.),Molecular systematics of plants, Chapman and Hall, New York, pp. 177–201.
Statistical Sciences, Inc. (1993):S-PLUS for Windows User's Manual, Version 3.1. Statistical Sciences, Inc., Seattle.
Taylor R.L. &Mulligan G.A. (1968):Flora of the Queen Charlotte Islands, Part 2. Cytological aspects of the vascular plants. Canada Department of Agriculture, Ottawa.
Taylor T.M.C. (1973):The rose family (Rosaceae)of British Columbia. British Columbia Provincial Museum, Victoria.
Tucker S.C. (1987): Floral initiation and development in legumes. In:Stirton C.H. (ed.),Advances in legume systematics 3, Royal Botanic Gardens, Kew pp. 183–239.
Tucker S.C. (1988): Loss versus suppression of floral parts. In:Leins P., Tucker S.C. &Endress P.K. (eds.),Aspects of floral development. J. Cramer, Gebr. Borntraeger Verlagsbuchhandlung, Berlin, pp. 69–82.
Wells T.C. &Phipps J.B. (1989): Studies inCrataegus (Rosaceae: Maloideae). XX. Interserial hybridization betweenCrataegus monogyna (seriesOxyacanthae) andCrataegus punctata (seriesPunctatae) in southern Ontario.Canad. J. Bot. 67: 2465–2472.
Whitlock M.C. (1995): Variance-induced peak shifts.Evolution 49: 252–259.
Wilkinson L. (1990):SYGRAPH: The system for graphics. Systat Inc., Evaston.
Yeboah Gyan K. &Woodell S.R.J. (1987): Analysis of insect pollen loads and pollinator efficiency of some common insect visitors of four species of woodyRosaceae.Funct. Ecol. 1: 269–274.
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Dickinson, T.A., Belaoussoff, S., Love, R.M. et al. North American black-fruited hawthorns. I. Variation in floral construction, breeding system correlates, and their possible evolutionary significance inCrataegus sect.Douglasii London. Folia Geobot 31, 355–371 (1996). https://doi.org/10.1007/BF02815380
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DOI: https://doi.org/10.1007/BF02815380