The following four papers are synopses of ones delivered in connection with the Annual General Meeting of the Society held at Monks Wood Experimental Station, Abbots Ripton, Huntmgdon on 29th April, 1967. BETULA L. IN BRITAIN
Three species of Betula are native in Britain. One of these, the Dwarf Birch, Betula nana L., is almost restricted to Central and North Scotland, and is very distinct in its dwarf habit (and in other characters of leaf-shape and inflor-escence); although hybrids occur locally with B. pubescens, it n...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.665.6162 2023-05-15T15:44:28+02:00 The following four papers are synopses of ones delivered in connection with the Annual General Meeting of the Society held at Monks Wood Experimental Station, Abbots Ripton, Huntmgdon on 29th April, 1967. BETULA L. IN BRITAIN S. M. Walters The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.665.6162 http://archive.bsbi.org.uk/Proc7p179.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.665.6162 http://archive.bsbi.org.uk/Proc7p179.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://archive.bsbi.org.uk/Proc7p179.pdf text ftciteseerx 2016-01-08T17:04:55Z Three species of Betula are native in Britain. One of these, the Dwarf Birch, Betula nana L., is almost restricted to Central and North Scotland, and is very distinct in its dwarf habit (and in other characters of leaf-shape and inflor-escence); although hybrids occur locally with B. pubescens, it normally causes no taxonomic difficulty. The tree Birches, however, constitute a difficult taxo-nomic group which can only be understood on a world scale, and with cyto-genetic, experimental study. To some extent we can be said to understand the broad outline of the picture. It is possible to distinguish generally in Europe between a diploid species B. pendula Roth (B. verrucosa Ehrh.) with 2n = 28, and a tetraploid aggregate (2n = 56), for which the name B. pubescens Ehrh. is best used. 'Pure ' B. pendula is a tree up to 30 m, with slender, pendent, glabrous twigs beset with resin-glands, smooth silvery-white bark, dark bole with rectangular bosses, subglabrous biserrate leaves and a set of characters of fruit and catkin-scale. 'Pure ' B. pubescens subsp. pubescens is a shrub or small tree up to 20 m with hairy, eglandular twigs Text Betula nana Dwarf birch Unknown |
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Open Polar |
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Unknown |
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ftciteseerx |
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English |
description |
Three species of Betula are native in Britain. One of these, the Dwarf Birch, Betula nana L., is almost restricted to Central and North Scotland, and is very distinct in its dwarf habit (and in other characters of leaf-shape and inflor-escence); although hybrids occur locally with B. pubescens, it normally causes no taxonomic difficulty. The tree Birches, however, constitute a difficult taxo-nomic group which can only be understood on a world scale, and with cyto-genetic, experimental study. To some extent we can be said to understand the broad outline of the picture. It is possible to distinguish generally in Europe between a diploid species B. pendula Roth (B. verrucosa Ehrh.) with 2n = 28, and a tetraploid aggregate (2n = 56), for which the name B. pubescens Ehrh. is best used. 'Pure ' B. pendula is a tree up to 30 m, with slender, pendent, glabrous twigs beset with resin-glands, smooth silvery-white bark, dark bole with rectangular bosses, subglabrous biserrate leaves and a set of characters of fruit and catkin-scale. 'Pure ' B. pubescens subsp. pubescens is a shrub or small tree up to 20 m with hairy, eglandular twigs |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
S. M. Walters |
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S. M. Walters The following four papers are synopses of ones delivered in connection with the Annual General Meeting of the Society held at Monks Wood Experimental Station, Abbots Ripton, Huntmgdon on 29th April, 1967. BETULA L. IN BRITAIN |
author_facet |
S. M. Walters |
author_sort |
S. M. Walters |
title |
The following four papers are synopses of ones delivered in connection with the Annual General Meeting of the Society held at Monks Wood Experimental Station, Abbots Ripton, Huntmgdon on 29th April, 1967. BETULA L. IN BRITAIN |
title_short |
The following four papers are synopses of ones delivered in connection with the Annual General Meeting of the Society held at Monks Wood Experimental Station, Abbots Ripton, Huntmgdon on 29th April, 1967. BETULA L. IN BRITAIN |
title_full |
The following four papers are synopses of ones delivered in connection with the Annual General Meeting of the Society held at Monks Wood Experimental Station, Abbots Ripton, Huntmgdon on 29th April, 1967. BETULA L. IN BRITAIN |
title_fullStr |
The following four papers are synopses of ones delivered in connection with the Annual General Meeting of the Society held at Monks Wood Experimental Station, Abbots Ripton, Huntmgdon on 29th April, 1967. BETULA L. IN BRITAIN |
title_full_unstemmed |
The following four papers are synopses of ones delivered in connection with the Annual General Meeting of the Society held at Monks Wood Experimental Station, Abbots Ripton, Huntmgdon on 29th April, 1967. BETULA L. IN BRITAIN |
title_sort |
following four papers are synopses of ones delivered in connection with the annual general meeting of the society held at monks wood experimental station, abbots ripton, huntmgdon on 29th april, 1967. betula l. in britain |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.665.6162 http://archive.bsbi.org.uk/Proc7p179.pdf |
genre |
Betula nana Dwarf birch |
genre_facet |
Betula nana Dwarf birch |
op_source |
http://archive.bsbi.org.uk/Proc7p179.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.665.6162 http://archive.bsbi.org.uk/Proc7p179.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766378849256341504 |