File:Text-book of botany, morphological and physiological (1875) (14777983472).jpg

Identifier: textbookofbotany00sach (find matches)
Title: Text-book of botany, morphological and physiological
Year: 1875 (1870s)
Authors: Sachs, Julius, 1832-1897 Bennett, Alfred W. (Alfred William), 1833-1902 Thiselton-Dyer, William T. (William Turner), 1843-1928
Subjects: Botany
Publisher: Oxford, Clarendon Press
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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ovaiy, and crirtpfia, seed. ^ The most important and comprehensive work on the flowers of Angiosperms is Payers TraitedOrganog(nic de la Fleur (Paris 1857) with 154 plates. ANGIOSPERMS. 467 entire abortion either of the androecium or the gynajceum, the flower being in otherrespects constructed on the same type (Fig. 327, A); and in such cases it alsofrequently happens that hermaphrodite flowers are developed in addition to themale and female (polygamous species, as the ash, Acer, Saponaria ocymoides, &c.).But even in the greater number of cases where the male and female organs ecompletely developed in hermaphrodite flowers and functionally perfect, fertilisationtakes place by the conveyance of the pollen of one flower to the gynseceum ofother flowers or even of other individuals of the same species, because either polli-nation within tHe same flower is impossible in consequence of special contrivances(such as dichogamy), or because the pollen is potent only in the fertilisation of
Text Appearing After Image:
Fig. ■^^■;.—Akebia qttiiiata; A part of an inflorescence, i female, 6 male flowers; /> a male flower cut through leng^th-wise, fits sterile carpels; C horizontal section^ of a female flower (magnified); D horizontal section of a male flower;K gynaceum of the female flower with the sterile stamens a; Fan ovary cut through horizontally ; G an ovule ; // horizontalsection of an anther; a (in /> and C) the outer, a the inner stamens, c (in £) the carpels ; p (in B and C) the perianth. ovules of another flower (as in Orchideae, Corydalis, &c.). To these phenomenawe shall recur more in detail in the Third Book, when speaking of the physiologyof sexual reproduction. While in Gymnosperms the floral axis is usually elongated to such an extentthat the sexual organs, especially if numerous, are evidently arranged one aboveanother in alternate whorls or in spirals,—in Angiosperms, on the contrary, thefloral axis which bears the floral envelopes and sexual organs is so abbreviat

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