The Origin of Floral Structures Through Insect and Other AgenciesKegan Paul, Trench, Trübner & Company, Limited, 1888 - 349 pagini |
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Pagina vii
... fact that the world had been peopled over and over again by old forms dying out and new forms coming in ; so that although it might account for the extinction of the former , it did not seem to me capable to account for the origin of ...
... fact that the world had been peopled over and over again by old forms dying out and new forms coming in ; so that although it might account for the extinction of the former , it did not seem to me capable to account for the origin of ...
Pagina 6
... fact ; but an obvious difference between them consists in the arrested state of the axis of the former , constituting the floral receptacle ; and the question arises , how has this arrest been brought about ? Like all other ...
... fact ; but an obvious difference between them consists in the arrested state of the axis of the former , constituting the floral receptacle ; and the question arises , how has this arrest been brought about ? Like all other ...
Pagina 8
... fact that two whorls prevail in Monocotyledons and are not at all uncommon in Dicotyledons ; and when the petaline whorl alone exists , as in Primulaceae and Myrsineæ , calycine staminodia are sometimes present which tend to restore the ...
... fact that two whorls prevail in Monocotyledons and are not at all uncommon in Dicotyledons ; and when the petaline whorl alone exists , as in Primulaceae and Myrsineæ , calycine staminodia are sometimes present which tend to restore the ...
Pagina 11
... fact , that , with the sole exception of the * I have fully explained this in my paper , On the Variations of the Angular Divergences of the Leaves of Helianthus Tuberosus , Trans . Lin . Soc . , vol . xxvi . , p . 647. See also On the ...
... fact , that , with the sole exception of the * I have fully explained this in my paper , On the Variations of the Angular Divergences of the Leaves of Helianthus Tuberosus , Trans . Lin . Soc . , vol . xxvi . , p . 647. See also On the ...
Pagina 12
... fact which corresponds with the rarity of a ternary arrangement occurring amongst flowers of Dicotyledons , but in order to fall over No. 1 it would have to pass through 270 ° , that is from right to left , practically an impossibility ...
... fact which corresponds with the rarity of a ternary arrangement occurring amongst flowers of Dicotyledons , but in order to fall over No. 1 it would have to pass through 270 ° , that is from right to left , practically an impossibility ...
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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