The Origin of Floral Structures Through Insect and Other AgenciesKegan Paul, Trench, Trübner & Company, Limited, 1888 - 349 pagini |
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Pagina 25
... instances I am aware of in which the calyx seems to consist of a single member are some species of Aristolochia . In Mussænda one out of the five sepals is greatly enlarged to become an attractive organ . * One petal is occasionally ...
... instances I am aware of in which the calyx seems to consist of a single member are some species of Aristolochia . In Mussænda one out of the five sepals is greatly enlarged to become an attractive organ . * One petal is occasionally ...
Pagina 27
George Henslow. cessive pairs . The following may be taken as illustrative . instances . The sepals of Papaver and Fumaria , the outer stamens of Cruciferæ . In Circaa all the whorls are dimerous , in Oleaceae the essential organs alone ...
George Henslow. cessive pairs . The following may be taken as illustrative . instances . The sepals of Papaver and Fumaria , the outer stamens of Cruciferæ . In Circaa all the whorls are dimerous , in Oleaceae the essential organs alone ...
Pagina 34
... instances it is a primitive number , as stated above . As a rare instance of symmetrical decrease may be mentioned Lythrum Salicaria , which has usually the central floret of each axillary cyme 6 - merous , but the lateral ones only 5 ...
... instances it is a primitive number , as stated above . As a rare instance of symmetrical decrease may be mentioned Lythrum Salicaria , which has usually the central floret of each axillary cyme 6 - merous , but the lateral ones only 5 ...
Pagina 35
... instances , and not opposite , as in the primitive type amongst Dicotyledons , then a heptamerous arrangement would occur . If , therefore , there be any existing illustra- tion , it must , by the very nature of the case , be ...
... instances , and not opposite , as in the primitive type amongst Dicotyledons , then a heptamerous arrangement would occur . If , therefore , there be any existing illustra- tion , it must , by the very nature of the case , be ...
Pagina 37
George Henslow. less , it occurs as a " definite " number in several instances . The 12 stamens of Lythrum are , of course , two series of six each . Both 12 and 24 are found in the Crassulaceæ , as in Sempervivum , in which genus the ...
George Henslow. less , it occurs as a " definite " number in several instances . The 12 stamens of Lythrum are , of course , two series of six each . Both 12 and 24 are found in the Crassulaceæ , as in Sempervivum , in which genus the ...
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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