Seed Micromorphology Of Neotropical Begonias
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Seed Micromorphology Of Neotropical Begonias
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Author : Anton De Lange
language : en
Publisher:
Release Date : 1999
Seed Micromorphology Of Neotropical Begonias written by Anton De Lange and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Science categories.
The seeds of about 235 Neotropical Begonia species, representing almost all recognized American Begonia sections, were studied using scanning electron microscopy. The seeds show an appreciable diversity in size, shape, and micromorphology, which is helpful in the delimitation of sections and sometimes also of species. Mean seed length varies from 235 m in Begonia filipes to 1450 m in B. fruticosa; most seeds have a length between 300 m and 600 m. The shape of the seeds varies from almost globular to narrowly elliptic, and the length to width ratio ranges from 1.2 in B. hexandra to 8.1 in B. fruticosa. Further differences exist in the shape of the testal cells, the undulation of the anticlinal walls, the bulging of the outer periclinal walls, and the pattern and roughness of the cuticle. Five of the 15 mainly Brazilian, five of the 12 Andean and Guianan, and one of the eight middle American sections have a seed structure that is characteristic at the sectional level. All these sections have a relatively restricted geographical distribution, and they may differ in growth form or habitat. Most species of the other sections, including the larger and more widely distributed sections Begonia, Gireoudia, and Knesebeckia, have seeds conforming to the ordinary seed type. In a number of the sections, the structural differences of the seeds are nicely correlated with differences in growth form and/or in means of dispersal. In contrast to the African begonias, the great majority of the Neotropical begonias have anemoballistic dispersal. Seeds may be adapted to wind dispersal by extended micropylar and/or chalazal ends with inflated, air-filled cells, such as in the Brazilian sections Solananthera, Trendelenburgia, and Enita and in the Andean section Rossmannia, or by a more pronounced surface with deep, collapsed testal cells, such as in sections Gobenia and Scheidweileria. Zooballistic dispersal by passing animals is supposed to be present in section Casparya. The seeds of sections Casparya and Trachelocarpus have very pronounced cuticular patterns and may be secondarily dispersed by rain wash or by adhering to animals. No distinct indications for an intercontinental relationship between Neotropical, African, and Asiatic sections could be established.
Seed Micromorphology Of Neotropical Begonias
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Author :
language : en
Publisher:
Release Date : 1999
Seed Micromorphology Of Neotropical Begonias written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
Seed Micromorphology Of Neotropical Begonias
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Author :
language : en
Publisher:
Release Date : 1999
Seed Micromorphology Of Neotropical Begonias written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
Seed Micromorphology Of Neotropicals Begonias
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Author : A. de Lange
language : en
Publisher:
Release Date : 1999
Seed Micromorphology Of Neotropicals Begonias written by A. de Lange and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
Structure Micromorphology Of Begonia Seeds
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Author : Ferdinand Bouman
language : en
Publisher:
Release Date : 1983
Structure Micromorphology Of Begonia Seeds written by Ferdinand Bouman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Begonias categories.
Smithsonian Contributions To Botany
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Author : Smithsonian Institution
language : en
Publisher:
Release Date : 1969
Smithsonian Contributions To Botany written by Smithsonian Institution and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Botany categories.
Micromorphology Of The Seeds In Begonia Section Solanthera A Dc
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Author :
language : en
Publisher:
Release Date : 1986
Micromorphology Of The Seeds In Begonia Section Solanthera A Dc written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
Seed Micromorphology Of The Genus Begonia In Africa
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Author : A. de Lange
language : en
Publisher:
Release Date : 1992
Seed Micromorphology Of The Genus Begonia In Africa written by A. de Lange and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
The Sections Of Begonia
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Author : J. Doorenbos
language : en
Publisher:
Release Date : 1998
The Sections Of Begonia written by J. Doorenbos and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Nature categories.
Micromorphology Of The Seed Coats In Begonia Section Squamibegonia Warb
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Author : Ferdinand Bouman
language : en
Publisher:
Release Date : 1982
Micromorphology Of The Seed Coats In Begonia Section Squamibegonia Warb written by Ferdinand Bouman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Begonias categories.
