The Origin of Floral Structures Through Insect and Other AgenciesKegan Paul, Trench, Trübner & Company, Limited, 1888 - 349 pagini |
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Pagina xi
... present work to return to 1795 , and to revive the " Monde ambiant " of Geoffroy Saint Hilaire , as the primal cause of change . My object is to endeavour to refer every part of the structures of flowers to some one or more definite ...
... present work to return to 1795 , and to revive the " Monde ambiant " of Geoffroy Saint Hilaire , as the primal cause of change . My object is to endeavour to refer every part of the structures of flowers to some one or more definite ...
Pagina 7
... present , and the androecium is then isomerous with the entire perianth . More often one whorl is arrested , and then it may be either one ; but most usually it is the petaline . On the other hand , the calycine may not be developed as ...
... present , and the androecium is then isomerous with the entire perianth . More often one whorl is arrested , and then it may be either one ; but most usually it is the petaline . On the other hand , the calycine may not be developed as ...
Pagina 8
... present which tend to restore the complete number , as in the genus Samolus in the former and in the tribe Theophrasteœ of the latter order . The reduction of the number of carpels is very generally carried to a greater extent than that ...
... present which tend to restore the complete number , as in the genus Samolus in the former and in the tribe Theophrasteœ of the latter order . The reduction of the number of carpels is very generally carried to a greater extent than that ...
Pagina 10
... present a more primitive type than alternate ; that this is so , is not only reasonable from the primordial condition of the cotyledons of Dicotyledons , but the transition from an opposite to an alternate condition may be often ...
... present a more primitive type than alternate ; that this is so , is not only reasonable from the primordial condition of the cotyledons of Dicotyledons , but the transition from an opposite to an alternate condition may be often ...
Pagina 13
... present structure of flowers , it is not only neces- sary to consider the floral symmetry of an immense number of genera , and so ascertain what are the relative proportions of certain numbers when associated with alternate and oppo ...
... present structure of flowers , it is not only neces- sary to consider the floral symmetry of an immense number of genera , and so ascertain what are the relative proportions of certain numbers when associated with alternate and oppo ...
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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