. Plant life in Alpine Switzerland; being an account in simple language of the natural history of Alpine plants. Mountain plants. THE STRUCTURE OF THE FLOWER 331 fig. XXX Crocus. make it easy for the wind to waft the fruits along and so distribute them in new situations. There are two types of floret, the outer or ray florets, which have strap-shaped corollas and no stamens, and the hermaphrodite disc florets, which have a symmetrifcal corolla of five united petals and five epvpetalous stamens. The latter are syngenesious, and form a hollow cylinder round the style. The ovary, which contains a
. Plant life in Alpine Switzerland; being an account in simple language of the natural history of Alpine plants. Mountain plants. THE STRUCTURE OF THE FLOWER 331 fig. XXX Crocus. make it easy for the wind to waft the fruits along and so distribute them in new situations. There are two types of floret, the outer or ray florets, which have strap-shaped corollas and no stamens, and the hermaphrodite disc florets, which have a symmetrifcal corolla of five united petals and five epvpetalous stamens. The latter are syngenesious, and form a hollow cylinder round the style. The ovary, which contains a single ovule, is prolonged into a slender style, divided at the top into a bifid stigma. One disc floret is represented cut in half to show the stamens. The Buttercup, Pea, Saxifrage, and Groundsel are all Dicotyledons. Text- shows the flower of the a Monocotyledon. Here the perianth, which is epigynous, is not dififerentiated into calyx and corolla, but the segments are all alike and coloured. The stamens are attached to the perianth tube. The three carpels are united and form the ovary and style, but the curious funnel-shaped and toothed stigmas are free from one another. Among the Monocotyledons we find a great variety of flowers, showing polypetcdy, gamopetaly, and apetaly, and also hypogyny and epigyny, precisely as among the Dicotyledons. The arrangement of the flowers on the plant is by no means haphazard. Sometimes the flowers arise singly, just as leafy branches may occur, in the axils of the leaves. This happens, for instance, in the Violets, but the fact is not obvious at first sight, because the stem and the leaf bases are hidden away. Fig. XXX.—The Flower of a Crocus. A typical Mo- nocotyledonous Flower, (natural order Iridacese). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Arbe
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1910
