A Taxonomic Study of Western Canadian Species in the Genus Betula PDF Download
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Author: Janet R. Dugle
Publisher:
ISBN:
Category :
Languages : en
Pages : 77
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Author: Janet R. Dugle
Publisher:
ISBN:
Category :
Languages : en
Pages : 77
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Author: Janet Rogge Dugle
Publisher:
ISBN:
Category : Birch
Languages : en
Pages : 0
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Book Description
Five western North American birches, Betula fontinalis . B. glandulosa , B. pumila var. glandulifera , B. resinifera and B. papyrifera are studied taxonomically. Synonymy, descriptions, distribution and representative specimens examined are included. Four hybrid taxa, B. x winteri , B. x sargentii , B. x arbuscula, and B. x uliginosa , are described for the first time and three additional hybrids, B>. x utahensis , B. x eastwoodae and B. x sandbergii are also included. When birch species are in contact, they often hybridize. The populations so formed have been analyzed and the nature of several hybrid entities determined. The methods of analysis applied are as follows: chromatography of leaves and bark; hybrid index; polygonal graphs; chromosome numbers; pollen size, morphology and stainability; stomatal size; germination data; and pictorialized scatter diagrams. Betula x uliginosa (2n = 28-56) is the result of hybridization between B. resinifera and B. pumila var. glandulifera . In the population analyzed, introgression was in the direction of B. pumila var. glandulifera , the birch with the higher chromosome number. When B. pumila var. glandulifera is in contact with B. glandulosa , B. x sargentii (2n = 28-56) is produced. Introgression seems to be in both directions, although most of the gene flow is in the direction of the taxon with the higher chromosome number, B. pumila var. glandulifera . B. x eastwoodae (2n = 28) is the result of hybridization between B. glandulosa and B. fontinalis . Introgression was influenced very little by environmental selection, and B. x eastwoodae seemed to be as common as either of the parental species; and any gene flow was in either direction. B. x utahensis (2n = 28-84 with a concentration at 2n = 56) is the result of hybridization between B. papyrifera and B. fontinalis . In populations of these birches, introgression is mainly from B. fontinalis into B. papyrifera . Hybridization of B. x sargentii and B. papyrifera results in B. x arbuscula (2n = 28-84), a rare hybrid. Tentative conclusions are that introgression is in the direction of B. papyrifera , the taxon with the higher chromosome number. Hybridization of B, resinifera and B. papyrifera produces B. x winteri (2n = 28-84 with a concentration of individuals at 2n = 56). In the populations of these birches which were analyzed, introgression was in both directions. B. x sandbergii (2n = 56-84) results from hybridization of B. papyrifera and B. pumila var. glandulifera . As contrasted with the above, and probably as a result of strong environmental influence in the area in which this cross was analyzed, introgression was in the direction of J3. pumila var. glandulifera , the parental taxon with the lower chromosome number.
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Category : Forests and forestry
Languages : en
Pages : 196
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Category : Agriculture
Languages : en
Pages : 375
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Author:
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ISBN:
Category : Forests and forestry
Languages : en
Pages : 340
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Author: Kenneth Ashburner
Publisher: Botanical Magazine Monograph
ISBN: 9781842461419
Category : Science
Languages : en
Pages : 0
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Book Description
Birches or Betula are among the most attractive and common trees in the landscape and in gardens. The Genus Betula is the first monograph published on this plant group, the species of which have been notoriously difficult to identify. Accounts are given of all known birches found in Europe, Asia and North America, both white and brown barked, and a key for their identification. An invaluable tool for arboriculturalists and professional and amateur gardeners, and will also appeal to lovers of botanical art.
Author: Bruce Paul Dancik
Publisher:
ISBN:
Category : Hybridization
Languages : en
Pages : 102
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Book Description
Author: Les Viereck
Publisher: University of Alaska Press
ISBN: 160223132X
Category : Nature
Languages : en
Pages : 388
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Book Description
Alaska Trees and Shrubs has been the definitive work on the woody plants of Alaska for more than three decades. This new, completely revised second edition provides updated information on habitat, as well as detailed descriptions of every tree or shrub species in the state. New distribution maps reflect the latest survey data, while the keys, glossary, and appendix on non-native plants make this the most useful guide to Alaska trees and shrubs ever published.
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Category : Plant conservation
Languages : en
Pages : 88
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Author: Theodosius Dobzhansky
Publisher: Springer Science & Business Media
ISBN: 1468480944
Category : Science
Languages : en
Pages : 459
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Book Description
1 On Some Fundamental Concepts of Darwinian Biology.- Vitalism, Mechanism, and Compositionism.- Adaptedness and Adaptation.- Adaptedness to Survive and to Reproduce.- Adaptability.- Evolutionary Plasticity.- The Problem of Quantification of Adaptedness.- Darwinian Fitness.- Varieties of Natural Selection.- Darwinian Fitness and Adaptedness.- Evolutionary Opportunism and Adaptive Radiation.- Progressive Evolution.- References.- 2 Cave Ecology and the Evolution of Troglobites.- Animal Life in Caves.- The Cave Ecosystem.- Regressive Evolution in Cave Animals.- Speciation and Adaptation in Troglob.
