The Origin of Floral Structures Through Insect and Other AgenciesKegan Paul, Trench, Trübner & Company, Limited, 1888 - 349 pagini |
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Pagina viii
... According to my view , trans- mutation by purely internal causes is not to be enter- tained . . . . The action of external inciting causes is alone able to produce modifications . " Mr. Wallace adds that he had " arrived at almost ...
... According to my view , trans- mutation by purely internal causes is not to be enter- tained . . . . The action of external inciting causes is alone able to produce modifications . " Mr. Wallace adds that he had " arrived at almost ...
Pagina 14
... according to the theory advanced that 5 - merous whorls are cycles of the type . As a corroboration is the fact that such whoris often have their parts arranged quincuncially in æstivation ( Fig . 3 , a ) ; and when they are not so they ...
... according to the theory advanced that 5 - merous whorls are cycles of the type . As a corroboration is the fact that such whoris often have their parts arranged quincuncially in æstivation ( Fig . 3 , a ) ; and when they are not so they ...
Pagina 23
... according to the type . They are , how- ever , so far modified in position as to become superposed to the sepals in groups . Similarly the stamens form series of 21 , each being superposed in radial lines to the petals . The ...
... according to the type . They are , how- ever , so far modified in position as to become superposed to the sepals in groups . Similarly the stamens form series of 21 , each being superposed in radial lines to the petals . The ...
Pagina 35
... According to the description given of this plant in the Genera Plantarum , the numbers of the three outer whorls range from 5 to 9 , the capsule being 5 - valved . The leaves , on the other hand , are sæpe tot quot petala subverti ...
... According to the description given of this plant in the Genera Plantarum , the numbers of the three outer whorls range from 5 to 9 , the capsule being 5 - valved . The leaves , on the other hand , are sæpe tot quot petala subverti ...
Pagina 42
... according as the cords of the perianth - leaves give off new members or not . Theoretically there should be at least one whorl of stamens superposed to the sepals , another superposed to the petals , and two whorls of carpels as well ...
... according as the cords of the perianth - leaves give off new members or not . Theoretically there should be at least one whorl of stamens superposed to the sepals , another superposed to the petals , and two whorls of carpels as well ...
Alte ediții - Afișează-le pe toate
The Origin of Floral Structures Through Insect and Other Agencies George Henslow Vizualizare completă - 1893 |
The Origin of Floral Structures Through Insect and Other Agencies George Henslow Vizualizare completă - 1888 |
Termeni și expresii frecvente
adaptation to insect androecium anemophilous anthers appear arrested atrophy autogamy axial axis bear become bracts calyx capsules carpellary carpels cause cells character chorisis cleistogamous cleistogamous flowers colour condition corolla crossed Darwin degeneracy degradation Demy 8vo diclinism differentiated fact female flowers fertile fertilisation fibro-vascular cords filaments floral whorls florets foliaceous Forms of Flowers Fourth Edition genera genus grains hermaphrodite heterostyled hypertrophy Illustrations insect agency insects intercrossing irregular irritation Journ Labiata latter leaf leaves less long-styled form male flowers marginal mature Müller nature normally observed occur Orchids origin ovary ovules ovuliferous pedicel perianth petaline petals petioles phyllotaxis pistil placentas pollen pollen-tubes Primula produced protandrous protogynous Ranunculus receptacular tube regard remarkable result seedlings seeds seen self-fertilisation self-fertilised plants sepaline sepals short-styled form Small crown 8vo species spiral stamens stigmas structure style superposed temperature Teratology Third Edition tion tissue usually visited weight whorls
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