File:The natural history of plants, their forms, growth, reproduction, and distribution; (1895) (14762048084).jpg

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Identifier: cu31924011933227 (find matches)
Title: The natural history of plants, their forms, growth, reproduction, and distribution;
Year: 1895 (1890s)
Authors: Kerner von Marilaun, Anton, 1831-1898 Oliver, F. W. (Francis Wall), 1864-1951 Busk, Marian (Balfour) Lady, 1861-1941 Macdonald, Mary Frances (Ewart) Kerner von Marilaun, Anton, 1831-1898. Pflanzenleben. English
Subjects: Botany
Publisher: New York, H. Holt and Company
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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Fig. 232.—^The Elm (Ulmus campestris).> With flowers. With fruits. in these plants not glumes but small perianth-leaves form the protective enveloperound the anthers before they open. Moreover, in Hemp and Hops, and the above-mentioned species of Meadow-rue, the anther-lobes do not burst wide open whenthey dehisce, but exhibit parallel slits which are at first so narrow that the pollencan only shake out little by little. Plantains (Plantago) also have their pollenshaken out of the anthers, which are borne on long filaments, by the wind. Thefilaments are tucked in so long as the flower is in bud, but when the petals unfoldthe filaments straighten out and project beyond the floral spike. The versatile 144 DISPERSION OF POLLEN BY THE WIND. anthers borne by these filaments are broad and for the most part heart-shaped; thetwo lobes of which each anther is composed only open on the side turned to the sky,
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Fig. 233.—Mountain Pine (Pinus Pumilio). 1 A single poUiniferous scale (stamen) seen from above. 2 Three poUinUerous scales, one above the other, seen from the side.The pollen falling from each anther alights on the upper surface of the stamen next below, s Two spikes of polliniferousscales. * Branch with apical group of staminal flowers from which pollen is being discharged. 6 Female flower, i, xlO;8x8; 5x2; * natural size. SO that the small gaping slit through which the pollen has to be discharged into theair faces upward. Consistently with this fact we find that in Plantains it takesa couple of days to disperse all the pollen. The same category includes the Elms DISPERSION OF POLLEN BY THE WIND. 145 (Ulmus, see fig. 232), the Japanese Boceonia (Bocconia Japonica), the Meadow-rueswith erect and divergent stamens (Thalictrum aquilegifolium, T. angustifolium,T. flavum, &c.) and several species of Poterium and Sanguisorba. The filamentsof Elms are straight at all times, but they

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current10:13, 22 October 2015Thumbnail for version as of 10:13, 22 October 20151,388 × 1,808 (1.02 MB) (talk | contribs)== {{int:filedesc}} == {{information |description={{en|1=<br> '''Identifier''': cu31924011933227 ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=insource%3A%2Fcu31924011933227%2F find matches])<...

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