The Origin of Floral Structures Through Insect and Other AgenciesKegan Paul, Trench, Trübner & Company, Limited, 1888 - 349 pagini |
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Pagina 10
... such as of the Jerusalem Artichoke . Whenever this plant bears opposite leaves below , and alternate leaves above , it will be found that the arrangement of the latter is almost invariably 10 THE STRUCTURE OF FLOWERS .
... such as of the Jerusalem Artichoke . Whenever this plant bears opposite leaves below , and alternate leaves above , it will be found that the arrangement of the latter is almost invariably 10 THE STRUCTURE OF FLOWERS .
Pagina 19
... bear 3 - merous flowers , they are replaced later by the regularly 4 - merous Although these changes frequently occur in the same plant , they usually are not permanent . Yet they occasionally appear to have become so , as in the ...
... bear 3 - merous flowers , they are replaced later by the regularly 4 - merous Although these changes frequently occur in the same plant , they usually are not permanent . Yet they occasionally appear to have become so , as in the ...
Pagina 52
... bear the burden . The tubular structure is the strongest possible , and when short , as in rotate corollas , little extra aid is required ; but if it be long and visited by heavy insects and not by Lepidoptera , which hover in front of ...
... bear the burden . The tubular structure is the strongest possible , and when short , as in rotate corollas , little extra aid is required ; but if it be long and visited by heavy insects and not by Lepidoptera , which hover in front of ...
Pagina 56
... bear upon it by different insect visitors ; and the cords are invariably placed just where the strains are greatest . The number of ribs to the calyx has been adopted by systematists as generic characters in some of the Labiata , as ...
... bear upon it by different insect visitors ; and the cords are invariably placed just where the strains are greatest . The number of ribs to the calyx has been adopted by systematists as generic characters in some of the Labiata , as ...
Pagina 75
... bear ovules is common enough , and the pla- centas often swell out there to form bosses which we may reasonably conceive as coa- lescing to form the continuous ring character- istic of Dionaea . Thus Acer illustrates how each of the two ...
... bear ovules is common enough , and the pla- centas often swell out there to form bosses which we may reasonably conceive as coa- lescing to form the continuous ring character- istic of Dionaea . Thus Acer illustrates how each of the two ...
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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Pagina 30 - II. Physics and Politics ; or, Thoughts on the Application of the Principles of "Natural Selection " and " Inheritance
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Pagina 21 - HDM SPENCE. Genesis. By the Rev. T. WHITELAW, MA With Homilies by the Very Rev. JF MONTGOMERY, DD, Rev. Prof. RA REDFORD, MA, LL.B., Rev. F. HASTINGS, Rev. W. ROBERTS, MA An Introduction to the Study of the Old Testament by the Venerable Archdeacon...
Pagina 26 - STRECKER- WISLICENUS.— Organic Chemistry. Translated and Edited, with Extensive Additions, by WR HODGKINSON, Ph.D., and AJ GREENAWAY, FIC Second and cheaper Edition. Demy 8vo, 12s. 6d. Suakin, 1885 ; being a Sketch of the Campaign of this year. By an Officer who was there.