. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. tne botinv The pistil is i tteu ) rolongi d above the ovar\ This 1 art IS the Anovuleisafleshj sporangium, lacketed by one or two (larely three) outgiowths from the base, the mteijuments, which almost inclose the sporangium proper {nucellHs). Within the sporan- gium of the ovule, several (1 to 40) spores
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. tne botinv The pistil is i tteu ) rolongi d above the ovar\ This 1 art IS the Anovuleisafleshj sporangium, lacketed by one or two (larely three) outgiowths from the base, the mteijuments, which almost inclose the sporangium proper {nucellHs). Within the sporan- gium of the ovule, several (1 to 40) spores begin to de- velop. Of these, however, rarely more than one reaches maturity. This spore is never set free as the pollen spores are. It therefore acquires no thick wall, and in a FLOWER section of the sporangium appears as a cavity with- in the delicate tissue which surrounds it. It later becomes the so-called embryo sac, within which occurs the process of '/f\!rt(\ fertilization (which see). V. ^ ,\ The ovuhs commonly arise upon â ri:ijii liiiis or I'idges which project :to the pi-til chamber, more rarely tlic wloih- interior surface of the .'ary. These lines or ridges are called 835. Section across i/lncentu:. See Figs. 825, 835, 837. the compound Jq a simple pistil there is usually but pistil of TuUp. one placenta (Fig. 837). In a compound Showing central pistji the union of the carpels may be Fi,â5^^â v,?"'i such as to produce a 1-chambered .hr«.chambered ^^.^^^^ ^^ the^vary may contain as many chambers as there are carpels (Pig. 835). In the former case the placentte will project iiiwiiiil from the wall of the ovary ; in the latter they will lie aggregated at the center, from which the\ iiiiiy project outward into the chambers of the ovary. When theovules are numerous, the placentte are often enlarged to form an ade- quate surface for their attachment, as in the potato and tomato (see also Fig. 837). In a considerable number of plants the ovules arise upo
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