The Origin of Floral Structures Through Insect and Other AgenciesKegan Paul, Trench, Trübner & Company, Limited, 1888 - 349 pagini |
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Pagina 7
... rise by branching , first , to a whorl of stamens and subsequently to a whorl of carpels , furnishing at least two marginal and one dorsal cord for each of the latter . In many flowers both whorls of stamens are present , and the ...
... rise by branching , first , to a whorl of stamens and subsequently to a whorl of carpels , furnishing at least two marginal and one dorsal cord for each of the latter . In many flowers both whorls of stamens are present , and the ...
Pagina 23
... rise to a radial series of stamens . From the preceding illustrations , it will now be seen that phyllotaxis lies at the foundation of the arrangements of the members of floral whorls ; that the type prevails in the sepals and petals ...
... rise to a radial series of stamens . From the preceding illustrations , it will now be seen that phyllotaxis lies at the foundation of the arrangements of the members of floral whorls ; that the type prevails in the sepals and petals ...
Pagina 24
... rise to an organ by the side of the former , it results , partly from the close proximity of the two and partly from the tendency of the remaining cords of the cylinder to " close up , " that the new member finally takes up a position ...
... rise to an organ by the side of the former , it results , partly from the close proximity of the two and partly from the tendency of the remaining cords of the cylinder to " close up , " that the new member finally takes up a position ...
Pagina 37
... rise to symmetrical increase or decrease accordingly ; or again , three whorls of the same flower may become n ± x , n ± y , n ± z - merous ; when all numerical symmetry between them will be destroyed . Similarly , if the parts be ...
... rise to symmetrical increase or decrease accordingly ; or again , three whorls of the same flower may become n ± x , n ± y , n ± z - merous ; when all numerical symmetry between them will be destroyed . Similarly , if the parts be ...
Pagina 43
... rise to them . On the other hand , in the Malvacea after the axis has supplied cords for the sepals , others furnish those of the corolla ; these latter , however , by radial division form two to each petal , subsequently dividing into ...
... rise to them . On the other hand , in the Malvacea after the axis has supplied cords for the sepals , others furnish those of the corolla ; these latter , however , by radial division form two to each petal , subsequently dividing into ...
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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