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Author: Surin Suksuwan
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Surin Suksuwan
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Ronald George van den Berg
Publisher:
ISBN:
Category : Begoniaceae
Languages : en
Pages : 66
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Author: J. Doorenbos
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 276
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Author: Lucia Campos Dominguez
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Andrey I. Baranov
Publisher:
ISBN:
Category : Begoniaceae
Languages : en
Pages : 104
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Author: Mark Hughes
Publisher:
ISBN:
Category :
Languages : en
Pages : 40
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Author: Daniel Caspar Thomas
Publisher:
ISBN:
Category : Begoniaceae
Languages : en
Pages : 179
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Author: Anton De Lange
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 60
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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.
Author: Maarten J. M. Christenhusz
Publisher: University of Chicago Press
ISBN: 022653670X
Category : Nature
Languages : en
Pages : 801
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Plants of the World is the first book to systematically explore every vascular plant family on earth—more than four hundred and fifty of them—organized in a modern phylogenetic order. Detailed entries for each family include descriptions, distribution, evolutionary relationships, and fascinating information on economic uses of plants and etymology of their names. All entries are also copiously illustrated in full color with more than 2,500 stunning photographs. A collaboration among three celebrated botanists at the Royal Botanic Gardens, Kew, Plants of the World is authoritative, comprehensive, and beautiful. Covering everything from ferns to angiosperms, it will be an essential resource for practicing botanists, horticulturists, and nascent green thumbs alike.
Author: Elsa Erika Marahrens
Publisher:
ISBN:
Category : Begonias
Languages : en
Pages : 240
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