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Volume 1,2 (1953) - Dansk Dendrologisk Forening

Volume 1,2 (1953) - Dansk Dendrologisk Forening

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148 DANSK DENDROLOGISK ÅRSSKRIFT IISummary.H. IRGENS-MØLLER: Crataegus in Northeastern America.The author deals with the many species of Crataegus and theirprobable origin as hybrids, due to the clearing of the aboriginalconiferous woods and the utilization of the land, considered as a"hybridization of surroundings". He draws comparison to the observedfacts concerning Iris fulva and I. hexagona var. giganteacoeruleafrom the estuary of Mississippi and their newly formed"swarms" of hybrids. Perhaps "hybridization of surroundings"might be used in the work of domestication and amelioration ofcultivated plants.Litteraturhenvisning.ANDERSON, EDGAR: Introgressive Hybridization, 1949.MARIE-VICTORIN, F.: Phytogeographical problems of Eastern Canada, Amer. MidlandNat., 1938, 19; 489-558.CAIN, STANLEY A.: Foundation of Plant Geography, 1944.FERNALD, M. L.: Gray's Manual of Botany, 1950.

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