XVI. On the leaf-arrangement of the crowberry ( empetrum nigrum )
Pursuing the study of leaf-arrangement, the author finds that the crowberry of our moors ( Empetrum nigrum ) habitually exhibits a peculiar mole of variation in the arrangement of the leaves on different parts of the same twig. Out of fifty crowberry-twigs taken at random, only four (and these fragm...
Published in: | Proceedings of the Royal Society of London |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
The Royal Society
1877
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1098/rspl.1876.0035 https://royalsocietypublishing.org/doi/pdf/10.1098/rspl.1876.0035 |
id |
crroyalsociety:10.1098/rspl.1876.0035 |
---|---|
record_format |
openpolar |
spelling |
crroyalsociety:10.1098/rspl.1876.0035 2024-06-02T08:05:39+00:00 XVI. On the leaf-arrangement of the crowberry ( empetrum nigrum ) 1877 http://dx.doi.org/10.1098/rspl.1876.0035 https://royalsocietypublishing.org/doi/pdf/10.1098/rspl.1876.0035 en eng The Royal Society https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ Proceedings of the Royal Society of London volume 25, issue 171-178, page 158-160 ISSN 0370-1662 2053-9126 journal-article 1877 crroyalsociety https://doi.org/10.1098/rspl.1876.0035 2024-05-07T14:16:19Z Pursuing the study of leaf-arrangement, the author finds that the crowberry of our moors ( Empetrum nigrum ) habitually exhibits a peculiar mole of variation in the arrangement of the leaves on different parts of the same twig. Out of fifty crowberry-twigs taken at random, only four (and these fragments) preserved the same arrangement throughout. In the remaining forty-six the leaf-arrangement was found to undergo a progressive change in ascending from the base of the twig to the summit— a change from a simpler order to others more complex. In general the basal order was that denoted by the fraction ⅖; and this was found to pass most frequently into 2/7, which in turn was found to pass into 2/9, with or without an intermediate set of whorls of 4:2/9 generally passed into whorls of 5, sometimes into 2/11, which was the most complex arrangement that was met with in this plant. The following is a list of the transitions found in the fifty specimens:— In all these instances the striking peculiarity to be observed is that the arrangement passes from an order belonging to one phyllotactic series ( e. g. from the order ⅖ in the primary series ½, ⅓, ⅖, &c.) to an order belonging to another phyllotactic series ( e. g. to the order 2/7 in the secondary series ⅓, 1/4, 2/7, &c.), and that this is a phenomenon which could not result from uniform vertical condensation of the lower arrangement; whereas in other plants the ordinary transition is from one order to another of the same series ( e. g. from ⅖ to ⅜, 5/13, 8/21 &c.), and is such as would result from uniform vertical condensation of the lower arrangement (as the author has shown in a paper read before the Royal Society on the 30th April, 1874: see Proc. vol. xxii. p. 298). Article in Journal/Newspaper Crowberry Empetrum nigrum The Royal Society Proceedings of the Royal Society of London 25 171-178 158 160 |
institution |
Open Polar |
collection |
The Royal Society |
op_collection_id |
crroyalsociety |
language |
English |
description |
Pursuing the study of leaf-arrangement, the author finds that the crowberry of our moors ( Empetrum nigrum ) habitually exhibits a peculiar mole of variation in the arrangement of the leaves on different parts of the same twig. Out of fifty crowberry-twigs taken at random, only four (and these fragments) preserved the same arrangement throughout. In the remaining forty-six the leaf-arrangement was found to undergo a progressive change in ascending from the base of the twig to the summit— a change from a simpler order to others more complex. In general the basal order was that denoted by the fraction ⅖; and this was found to pass most frequently into 2/7, which in turn was found to pass into 2/9, with or without an intermediate set of whorls of 4:2/9 generally passed into whorls of 5, sometimes into 2/11, which was the most complex arrangement that was met with in this plant. The following is a list of the transitions found in the fifty specimens:— In all these instances the striking peculiarity to be observed is that the arrangement passes from an order belonging to one phyllotactic series ( e. g. from the order ⅖ in the primary series ½, ⅓, ⅖, &c.) to an order belonging to another phyllotactic series ( e. g. to the order 2/7 in the secondary series ⅓, 1/4, 2/7, &c.), and that this is a phenomenon which could not result from uniform vertical condensation of the lower arrangement; whereas in other plants the ordinary transition is from one order to another of the same series ( e. g. from ⅖ to ⅜, 5/13, 8/21 &c.), and is such as would result from uniform vertical condensation of the lower arrangement (as the author has shown in a paper read before the Royal Society on the 30th April, 1874: see Proc. vol. xxii. p. 298). |
format |
Article in Journal/Newspaper |
title |
XVI. On the leaf-arrangement of the crowberry ( empetrum nigrum ) |
spellingShingle |
XVI. On the leaf-arrangement of the crowberry ( empetrum nigrum ) |
title_short |
XVI. On the leaf-arrangement of the crowberry ( empetrum nigrum ) |
title_full |
XVI. On the leaf-arrangement of the crowberry ( empetrum nigrum ) |
title_fullStr |
XVI. On the leaf-arrangement of the crowberry ( empetrum nigrum ) |
title_full_unstemmed |
XVI. On the leaf-arrangement of the crowberry ( empetrum nigrum ) |
title_sort |
xvi. on the leaf-arrangement of the crowberry ( empetrum nigrum ) |
publisher |
The Royal Society |
publishDate |
1877 |
url |
http://dx.doi.org/10.1098/rspl.1876.0035 https://royalsocietypublishing.org/doi/pdf/10.1098/rspl.1876.0035 |
genre |
Crowberry Empetrum nigrum |
genre_facet |
Crowberry Empetrum nigrum |
op_source |
Proceedings of the Royal Society of London volume 25, issue 171-178, page 158-160 ISSN 0370-1662 2053-9126 |
op_rights |
https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
op_doi |
https://doi.org/10.1098/rspl.1876.0035 |
container_title |
Proceedings of the Royal Society of London |
container_volume |
25 |
container_issue |
171-178 |
container_start_page |
158 |
op_container_end_page |
160 |
_version_ |
1800750511358476288 |