The Origin of Floral Structures Through Insect and Other AgenciesKegan Paul, Trench, Trübner & Company, Limited, 1888 - 349 pagini |
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Pagina 9
... increased degradation the corolla may disappear entirely , as in Sagina apetala , some cleistogamous flowers , and in the Incompletæ gencrally . Such degradation is also characteristic of wind - fertilised flowers . As both calyx and ...
... increased degradation the corolla may disappear entirely , as in Sagina apetala , some cleistogamous flowers , and in the Incompletæ gencrally . Such degradation is also characteristic of wind - fertilised flowers . As both calyx and ...
Pagina 12
... from the * See note by the author , On the Causes of the Numerical Increase of Parts of Plants , Journ . Lin . Soc . Bot . , xvi . p . 1 . leaf type , that they have undergone such wonderful transfor- 12 THE STRUCTURE OF FLOWERS .
... from the * See note by the author , On the Causes of the Numerical Increase of Parts of Plants , Journ . Lin . Soc . Bot . , xvi . p . 1 . leaf type , that they have undergone such wonderful transfor- 12 THE STRUCTURE OF FLOWERS .
Pagina 18
... INCREASE AND DECREASE IN FLORAL WHORLS.- As another instance of variability adding further complica- tions , it may be observed that in both kinds of arrangements , namely , of those plants possessing alternate and those pos- sessing ...
... INCREASE AND DECREASE IN FLORAL WHORLS.- As another instance of variability adding further complica- tions , it may be observed that in both kinds of arrangements , namely , of those plants possessing alternate and those pos- sessing ...
Pagina 19
... increase or decrease . " By this I mean that the number of sepals , petals , and stamens often vary together from the typical number by the addition or subtraction of a member . Thus , in a single corymb of an Elder , 4- , 5- , 6 ...
... increase or decrease . " By this I mean that the number of sepals , petals , and stamens often vary together from the typical number by the addition or subtraction of a member . Thus , in a single corymb of an Elder , 4- , 5- , 6 ...
Pagina 21
... increase in the quantity of seeds . Thus , while no Labiate flower has more than four seeds , it has been ascertained that a Maxillaria bore 1,700,000 seeds ; and I found by calculation that a single plant of Foxglove yielded a million ...
... increase in the quantity of seeds . Thus , while no Labiate flower has more than four seeds , it has been ascertained that a Maxillaria bore 1,700,000 seeds ; and I found by calculation that a single plant of Foxglove yielded a million ...
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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