The Origin of Floral Structures Through Insect and Other AgenciesKegan Paul, Trench, Trübner & Company, Limited, 1888 - 349 pagini |
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Pagina viii
... remark that " I regarded the environment as by far the most important " cause " of variations , in that it influences the organ- ism , which , by its inherent but latent power to vary , responds to the external stimulus , and then ...
... remark that " I regarded the environment as by far the most important " cause " of variations , in that it influences the organ- ism , which , by its inherent but latent power to vary , responds to the external stimulus , and then ...
Pagina 9
... remarks on the principles of leaf arrangement . It has long been observed that these are referable to two kinds - one in which two or more leaves are situated on the same node , when they are decussate , * that is to say , each pair or ...
... remarks on the principles of leaf arrangement . It has long been observed that these are referable to two kinds - one in which two or more leaves are situated on the same node , when they are decussate , * that is to say , each pair or ...
Pagina 41
... remarks on the presence of whorls in flowers as follows : " Cycles alternating with each other are simply that of verticillate phyllotaxy , " † to which he refers the opposite , ternate , quaternate and quinate verti- cils . In the case ...
... remarks on the presence of whorls in flowers as follows : " Cycles alternating with each other are simply that of verticillate phyllotaxy , " † to which he refers the opposite , ternate , quaternate and quinate verti- cils . In the case ...
Pagina 46
... remarks - we find that the cause of the alternation of the whorls of the perianth , or of the calyx and corolla , is due to their being made up of cycles of spiral arrangements , which are projected on to the same plane , and so form ...
... remarks - we find that the cause of the alternation of the whorls of the perianth , or of the calyx and corolla , is due to their being made up of cycles of spiral arrangements , which are projected on to the same plane , and so form ...
Pagina 77
... remarks . The sections are taken on planes where the pistil is emerging from the receptacle ; s . represents the sepaline cords ; ab . st . abortive staminal cords ; p . the petal- ine and staminal ( combined ) ; d.c. dorsal carpellary ...
... remarks . The sections are taken on planes where the pistil is emerging from the receptacle ; s . represents the sepaline cords ; ab . st . abortive staminal cords ; p . the petal- ine and staminal ( combined ) ; d.c. dorsal carpellary ...
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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