On The Various Contrivances
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On The Various Contrivances By Which British And Foreign Orchids Are Fertilised By Insects
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Author : Charles Darwin
language : en
Publisher: London : J. Murray
Release Date : 1862
On The Various Contrivances By Which British And Foreign Orchids Are Fertilised By Insects written by Charles Darwin and has been published by London : J. Murray this book supported file pdf, txt, epub, kindle and other format this book has been release on 1862 with Gardening categories.
This 1862 publication describes the flower structure of orchids and their pollination to illustrate aspects of Darwin's evolutionary theory.
Darwin S Orchids
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Author : Retha Edens-Meier
language : en
Publisher: University of Chicago Press
Release Date : 2014-11-05
Darwin S Orchids written by Retha Edens-Meier and has been published by University of Chicago Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-11-05 with Biography & Autobiography categories.
A quorum of scientists offer reviews and results to celebrate the 150th anniversary of 'On The Various Contrivances By Which British And Foreign Orchids Are Fertilised By Insects, And On The Good Effects Of Intercrossing' (1862). Authors of the first ten chapters follow research on the pollination and breeding systems of the same orchid lineages that interested Darwin, including temperate and tropical species. Authors on the last two chapters provide information on the floral attractants and flowering systems of orchids using protocols and technologies unavailable during Darwin's lifetime.
On The Various Contrivances By Which British And Foreign Orchids Are Fertilised By Insects And On The Good Effects Of Intercrossing With Illustrations
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Author : Charles Darwin
language : en
Publisher:
Release Date : 1885
On The Various Contrivances By Which British And Foreign Orchids Are Fertilised By Insects And On The Good Effects Of Intercrossing With Illustrations written by Charles Darwin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1885 with categories.
On The Various Contrivances By Which British And Foreign Orchids Are Fertilised By Insects And The Good Effects Of Intercrossing
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Author : Charles Darwin
language : en
Publisher:
Release Date : 2012-08-01
On The Various Contrivances By Which British And Foreign Orchids Are Fertilised By Insects And The Good Effects Of Intercrossing written by Charles Darwin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-08-01 with Orchids categories.
This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book. ++++ The below data was compiled from various identification fields in the bibliographic record of this title. This data is provided as an additional tool in helping to ensure edition identification: ++++ On The Various Contrivances By Which British And Foreign Orchids Are Fertilised By Insects: And On The Good Effects Of Intercrossing Charles Darwin J. Murray, 1862 Fertilization of plants; Orchids; Pollination by insects
On The Various Contrivances
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Author : Darwin Charles
language : en
Publisher:
Release Date : 2018-08
On The Various Contrivances written by Darwin Charles and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-08 with categories.
On The Various Contrivances By Which British And Foreign Orchids Are Fertilised By Insects And On The Good Effects Of Intercrossing With Illustrations
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Author : Charles Darwin
language : en
Publisher:
Release Date : 1862
On The Various Contrivances By Which British And Foreign Orchids Are Fertilised By Insects And On The Good Effects Of Intercrossing With Illustrations written by Charles Darwin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1862 with Fertilization of plants categories.
First edition of Darwin's primary work on plant fertilization. Detailing the relationship between the sexual structure of orchids and the insects that fertilize them, this was the first of three volumes that followed the publication of the Origin which contained supporting evidence for the author's theory of natural selection. Darwin concludes that plants are equal to animals in the marvels of their adaptation; for example, he observes that wind-pollinated flowers have no colours; it is only those insect-pollinated varieties that have bright coloured petals and sweet smelling nectars.
On The Various Contrivances By Which British And Foreign Orchids Are Fertilised By Insects And On The Good Effects Of Intercrossing
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Author : Charles Darwin
language : en
Publisher: Theclassics.Us
Release Date : 2013-09
On The Various Contrivances By Which British And Foreign Orchids Are Fertilised By Insects And On The Good Effects Of Intercrossing written by Charles Darwin and has been published by Theclassics.Us this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-09 with categories.
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1862 edition. Excerpt: ... ably run into the same ovarian group: thus the vessels supplying the upper sepal, the Fig. xxxii. Upper or posterior sepal. Labellum. Section Of The Flower Of An Orchid. The little circles show the position of the spiral vessels S S. Stigmas; Sr, stigma modified into the rostellum. Ai. Fertile anther of the outer whorl; A 2 A3, anthers of the same whorl comhined with the lower petal, forming the labellum. ai 02. Kudimentary anthers of the inner whorl (fertile in Cypripedium), generally forming the clinandrum; 03, third anther of the same whorl, when present, forming the front of the column. fertile anther (A 1), and the upper pistil or stigma (i. e. rostellum S r), all unite and form the posterior ovarian group. Again, the vessels supplying one of the lower sepals, the corner of the labellum, and one of the two stigmas (S), unite and form the antero-lateral group; and so with all the other vessels. Hence, if the existence of groups of spiral vessels can be trusted, and Dr. Hooker informs me that he has never known them to speak falsely, the flower of an Orchid certainly consists of fifteen organs, in a much modified and confluent condition. "We see three stigmas, with the two lower ones generally confluent, and with the upper one modified into the rostellum. We see six stamens, arranged in two whorls, with one alone (A 1) generally fertile. In Cypripedium, however, two stamens of the inner whorl (a 1 and a 2) are fertile, and in other Orchids these two are represented in various ways more plainly than the remaining stamens. The third stamen of the inner whorl (o 3), when its vessels can be traced, forms the front of the column: Brown thought that it often formed a medial excrescence, or ridge, cohering to the labellum; or, in the case of...
On The Various Contrivances By Which British And Foreign Orchids Are Fertilized By Insects
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Author :
language : en
Publisher:
Release Date : 1862
On The Various Contrivances By Which British And Foreign Orchids Are Fertilized By Insects written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1862 with Fertilization of plants by insects categories.
On The Various Contrivances By Which British And Foreign Orchids Are Fertilized By Insects
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Author : Charles Darwin
language : en
Publisher:
Release Date : 1877
On The Various Contrivances By Which British And Foreign Orchids Are Fertilized By Insects written by Charles Darwin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1877 with categories.
Floral Biology
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Author : David G. Lloyd
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Floral Biology written by David G. Lloyd and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Studies in floral biology are largely concerned with how flowers function to promote pollination and mating. The role of pollination in governing mating patterns in plant populations inextricably links the evolution of pollination and mating systems. Despite the close functional link between pollination and mating, research conducted for most of this century on these two fundamental aspects of plant reproduction has taken quite separate courses. This has resulted in suprisingly little cross-fertilization between the fields of pollination biology on the one hand and plant mating-system studies on the other. The separation of the two areas has largely resulted from the different backgrounds and approaches adopted by workers in these fields. Most pollination studies have been ecological in nature with a strong emphasis on field research and until recently few workers considered how the mechanics of pollen dispersal might influence mating patterns and individual plant fitness. In contrast, work on plant mating patterns has often been conducted in an ecological vacuum largely devoid of information on the environmental and demographic context in which mating occurs. Mating-system research has been dominated by population genetic and theoretical perspectives with surprisingly little consideration given to the proximate ecological factors responsible for causing a particular pattern of mating to occur.