The Origin of Floral Structures Through Insect and Other AgenciesKegan Paul, Trench, Trübner & Company, Limited, 1888 - 349 pagini |
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Pagina 170
... fertile ; ( 8 ) seeds numerous and fertile . * Gærtner , in his Mémoire sur les Organes Reproducteurs des Phanéro- games , devotes a special chapter to the enlargement of the ovary without previous pollination , with the result of a ...
... fertile ; ( 8 ) seeds numerous and fertile . * Gærtner , in his Mémoire sur les Organes Reproducteurs des Phanéro- games , devotes a special chapter to the enlargement of the ovary without previous pollination , with the result of a ...
Pagina 201
... fertile . The same occurs late in the season , when the flowering period is drawing to a close . Such flowers repre- sent the preliminary stages leading to a permanently homo- gamous or protogynous condition , as the case may be , which ...
... fertile . The same occurs late in the season , when the flowering period is drawing to a close . Such flowers repre- sent the preliminary stages leading to a permanently homo- gamous or protogynous condition , as the case may be , which ...
Pagina 205
... derive the full benefit of intercrossing ; so that the Cowslip has to be contented with the results of the illegitimate union of the least fertile of the two forms . by distinct plants . The difference , however , being HETEROSTYLISM . 205.
... derive the full benefit of intercrossing ; so that the Cowslip has to be contented with the results of the illegitimate union of the least fertile of the two forms . by distinct plants . The difference , however , being HETEROSTYLISM . 205.
Pagina 208
... fertile , whether legitimately or illegitimately crossed , though in the latter the difference is slighter : in the former the ratio being 8 to 6 ; and in the latter , 7 to 6 . Homostyled forms of P. Auricula are not uncommon . Mr ...
... fertile , whether legitimately or illegitimately crossed , though in the latter the difference is slighter : in the former the ratio being 8 to 6 ; and in the latter , 7 to 6 . Homostyled forms of P. Auricula are not uncommon . Mr ...
Pagina 209
... fertile with undifferentiated pollen . Another species of Primula which often bears homo- morphic flowers is P. Sinensis . Mr. Darwin's attention was first directed to it by observing a long - styled plant - de- scended from a self ...
... fertile with undifferentiated pollen . Another species of Primula which often bears homo- morphic flowers is P. Sinensis . Mr. Darwin's attention was first directed to it by observing a long - styled plant - de- scended from a self ...
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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