The Origin of Floral Structures Through Insect and Other AgenciesKegan Paul, Trench, Trübner & Company, Limited, 1888 - 349 pagini |
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Pagina xvi
... marginal ovules and a " heel - like " " process , the origin of the free central placenta ... 19. Anatomy of the floral receptacles of Lysimachia and Primula , showing the cords of five carpels ... 20. Echium , showing declinate stamens ...
... marginal ovules and a " heel - like " " process , the origin of the free central placenta ... 19. Anatomy of the floral receptacles of Lysimachia and Primula , showing the cords of five carpels ... 20. Echium , showing declinate stamens ...
Pagina 7
... marginal and one dorsal cord for each of the latter . In many flowers both whorls of stamens are present , and the androecium is then isomerous with the entire perianth . More often one whorl is arrested , and then it may be either one ...
... marginal and one dorsal cord for each of the latter . In many flowers both whorls of stamens are present , and the androecium is then isomerous with the entire perianth . More often one whorl is arrested , and then it may be either one ...
Pagina 32
... marginal cords of the carpels ( m.c. ) . From this it will be seen that the longer stamens cannot be formed by " chorisis " of a common intermediate cord ; but , like those of all other members of the flower , their cords are separated ...
... marginal cords of the carpels ( m.c. ) . From this it will be seen that the longer stamens cannot be formed by " chorisis " of a common intermediate cord ; but , like those of all other members of the flower , their cords are separated ...
Pagina 40
... marginal cords pass up directly into the placentas , having originated in the same way ; and , in so doing , the floral re- ceptacle usually becomes extinct , and takes , as a rule , no further part in the construction of the central ...
... marginal cords pass up directly into the placentas , having originated in the same way ; and , in so doing , the floral re- ceptacle usually becomes extinct , and takes , as a rule , no further part in the construction of the central ...
Pagina 54
... marginal cord ; but as there are two margins which cohere , they may have a separate cord apiece ; and then there may result fifteen cords in all . Thus Stachys has five dorsal cords with barely traces of five marginal ones ; Ballota ...
... marginal cord ; but as there are two margins which cohere , they may have a separate cord apiece ; and then there may result fifteen cords in all . Thus Stachys has five dorsal cords with barely traces of five marginal ones ; Ballota ...
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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