The Origin of Floral Structures Through Insect and Other AgenciesKegan Paul, Trench, Trübner & Company, Limited, 1888 - 349 pagini |
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Pagina 11
... direction of the spiral . It will be at once ob- served that the numbers 6 , 9 , 14 , and 22 are in the -2 5 10 13 same row , and correspond to 18 the divergences ,,, 21 21 No. 17 falls into the 3 8 11 16 19 20 15 12 7 4 series , and ...
... direction of the spiral . It will be at once ob- served that the numbers 6 , 9 , 14 , and 22 are in the -2 5 10 13 same row , and correspond to 18 the divergences ,,, 21 21 No. 17 falls into the 3 8 11 16 19 20 15 12 7 4 series , and ...
Pagina 28
... the arrangement . Consequently , instead of there being five and eight " secondary spirals , " there are ten in one direction and sixteen in the other . 8 parts , and one over . If these seven 28 THE STRUCTURE OF FLOWERS .
... the arrangement . Consequently , instead of there being five and eight " secondary spirals , " there are ten in one direction and sixteen in the other . 8 parts , and one over . If these seven 28 THE STRUCTURE OF FLOWERS .
Pagina 31
... direction . A section at some distance below the flower reveals four or five cords forming a circle . These rapidly increase in number by branching laterally , till between ten and twenty are found arranged in an oval just below the ...
... direction . A section at some distance below the flower reveals four or five cords forming a circle . These rapidly increase in number by branching laterally , till between ten and twenty are found arranged in an oval just below the ...
Pagina 55
... direction , the two marginals having separated so widely in front , as to require an extra cord ( s ) . The two lateral ones have not separated to so great an extent , while on the posterior side , where little or no strain is felt ...
... direction , the two marginals having separated so widely in front , as to require an extra cord ( s ) . The two lateral ones have not separated to so great an extent , while on the posterior side , where little or no strain is felt ...
Pagina 60
... above by the connectival appendages . The arrow shows the direction of the insertion of the proboscis of a bee to reach the annular a Fig . 11. - Stamens of Centaurea . honey - disk at the base of the style ; 60 THE STRUCTURE OF FLOWERS .
... above by the connectival appendages . The arrow shows the direction of the insertion of the proboscis of a bee to reach the annular a Fig . 11. - Stamens of Centaurea . honey - disk at the base of the style ; 60 THE STRUCTURE OF FLOWERS .
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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