File:Lectures on the physiology of plants (1887) (14780951012).jpg

Identifier: lecturesonphysio00sach (find matches)
Title: Lectures on the physiology of plants
Year: 1887 (1880s)
Authors: Sachs, Julius, 1832-1897
Subjects: Plant physiology
Publisher: Oxford : The Clarendon Press
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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ies pcctinata (afterSchacht). A a leaf separated from tlie female floralaxis and looked at from above : it bears the ovuliferousscale s with the ovules sk (magnified). B upper partof the female flower (cone) m the mature state, j/axisof the cone (floral axis) ; c its leaves ; s the much-enlarged seminiferous scales. C a ripe seminiferousscale s with the two seeds sa and their wings f(reduced). FLOWERS OF ANGIOSPERMS. 759 the pods of the Bean, Pea, Bladder-Senna (Co/u/ca) and Paeony present easily observedcases of the same kind. The foliar nature of the ovary is somewhat more difficult todecipher when (as is in fact the commonest case) two, three, or more carpels areunited to form a simple two or more celled ovary. Suppose the three carpels repre-sented in C united inwards with one another and with the three which are absent, bytheir infolded margins: we should then have a six-celled ovary, consisting of sixcarpels. Considering the enormous variety of the flowering-plants, the numerous
Text Appearing After Image:
Fig. 44i.—Butomus wnbellatiis. A flower !nat. size). B carpels, after removal of the floral leaves and> (magnified) ; « stigmas. C transverse section of three of the mor.omerous carpels, each bearing numerousovules on the inner side. D a young ovule; /: the same immediately before fertilisation, ii integuments, Knucellus, KS raphe, em embryo-sac. /= transverse section through the stigmatic portion of a carpel (more highlymagnified); pollen-grains are attached to the stigmatic hairs. G transverse section of an anther; it is quadrilo-cular, but the dehiscence of the lobes ß at s takes place in such a way that it appears bi-locular. //part of ananther-lobe (corresponding to ß in G): y the place where it separates from the connective, e the epidermis, xthe layer of fibrous cells (erulntheciuni). / diagram of the whole flower ; the perianth// consists of two alternatetrimerous whorls; the andniicium likewise, but the stamens of the outer whorl are doubled (/), those of theinnery si

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