The Origin of Floral Structures Through Insect and Other AgenciesKegan Paul, Trench, Trübner & Company, Limited, 1888 - 349 pagini |
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Pagina xvii
... irritation by the support 47. Flower of Genista tinctoria , before and after mechanical irritation ; the claws of the keel and wing petals being in unstable equilibrium ... 48. Flowers of Lopezia in three stages , showing movements of ...
... irritation by the support 47. Flower of Genista tinctoria , before and after mechanical irritation ; the claws of the keel and wing petals being in unstable equilibrium ... 48. Flowers of Lopezia in three stages , showing movements of ...
Pagina 6
... irritation of insects in probing for juices , and causing nectaries to be formed . † It is the commonest thing for leaf- buds to be arrested , and sometimes metamorphosed as well , by insects puncturing and depositing their eggs in them ...
... irritation of insects in probing for juices , and causing nectaries to be formed . † It is the commonest thing for leaf- buds to be arrested , and sometimes metamorphosed as well , by insects puncturing and depositing their eggs in them ...
Pagina 86
... irritation set up by insects themselves is one of the most potent causes of a flow of sap to certain definite places , which encourages local growths , thereby inducing these unions to take place between the parts of any whorl 86 THE ...
... irritation set up by insects themselves is one of the most potent causes of a flow of sap to certain definite places , which encourages local growths , thereby inducing these unions to take place between the parts of any whorl 86 THE ...
Pagina 103
... irritation the protoplasm of the cells responds , and gives rise to tissues which are thrown out to withstand the strains due to the extraneous pressures * The fibro - vascular cords of the pedicel are arranged at regular intervals ...
... irritation the protoplasm of the cells responds , and gives rise to tissues which are thrown out to withstand the strains due to the extraneous pressures * The fibro - vascular cords of the pedicel are arranged at regular intervals ...
Pagina 106
... irritation affects the tube only , which thus elongates and contracts , resulting in little or no irregularity in the flowers , as in Enothera biennis , in which the calyx tube has contracted , or in Honeysuckle , which has a tubular ...
... irritation affects the tube only , which thus elongates and contracts , resulting in little or no irregularity in the flowers , as in Enothera biennis , in which the calyx tube has contracted , or in Honeysuckle , which has a tubular ...
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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