| 单词 | dicotyledon |
| 例句 | There are no other examples among the currently sequenced dicotyledon genomes that contain a sole single copy of an ancestral chromosome. The genome of Eucalyptus grandis : Nature : Nature Publishing Group 2014-06-10T04:00:00Z CUCURBITACEAE, a botanical order of dicotyledons, containing 87 genera and about 650 species, found in the temperate and warmer parts of the earth but especially developed in the tropics. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z In an old stem of Cycas, Encephalartos or Macrozamia the secondary wood consists of several rather unevenly concentric zones, while in some other genera it forms a continuous mass as in conifers and normal dicotyledons. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z Whether they be dicotyledons or monocotyledons, there is a fundamental agreement in the anatomy of the roots and stem of aquatic plants, and, in many cases, of the leaves as well. Darwin, and After Darwin, Volume 2 Post-Darwinian Questions: Heredity and Utility 2011-10-16T02:00:14.153Z The symmetry which is most commonly met with is trimerous and pentamerous—the former occurring generally among monocotyledons, the latter among dicotyledons. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z The dicotyledons are of more complex structure, and somewhat more perfect organization, than the monocotyledons: and some dicotyledonous families, such as the Composit�, are rather more complex in their organization than the rest. A System of Logic: Ratiocinative and Inductive 7th Edition, Vol. II 2011-03-01T03:00:40.557Z But most of the dicotyledons did not appear till the tertiary period, where more than two hundred species have been found. The Religion of Geology and Its Connected Sciences 2011-02-28T03:00:28.890Z The higher group, or dicotyledons, have been arranged into three divisions, according to the complexity of the flower. The Old Riddle and the Newest Answer We have since that time learned to know that cold climates far antedate the coming of the dicotyledons. Fossil Ice Crystals An Instance of the Practical Value of "Pure Science" A division takes place, by which four cells are formed in each, the exact mode of division differing in dicotyledons and monocotyledons. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z BORAGINACEAE, an order of plants belonging to the sympetalous section of dicotyledons, and a member of the series Tubiflorae. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 2 "Bohemia" to "Borgia, Francis" Sixty-five species of plants have been identified, of which there are fifteen ferns, two cycads, eleven conifer�, three monocotyledons, and thirty-four dicotyledons. Island Life Or the Phenomena and Causes of Insular Faunas and Floras It was merely the low Fucaceæ and Conferveæ of the sea that I found meeting and mixing with the descending dicotyledons of the land. My Schools and Schoolmasters or The Story of my Education. This collection should be made in a different manner, for the trunks of the monocotyledons and ferns, and for those of the dicotyledons. Movement of the International Literary Exchanges, between France and North America from January 1845 to May, 1846 With Instructions for Collecting, Preparing, and Forwarding Objects of Natural History Written by The Professors Administrators of The Museum Of Natural History At Paris. And Instructions Relative to Anthropology and Zoology In some cases only one covering is formed, especially amongst gamopetalous dicotyledons, as in Compositae, Campanulaceae, also in walnut, &c. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z The dicotyledons are of more complex structure, and somewhat more perfect organization, than the monocotyledons; and some dicotyledonous families, such as the Compositæ, are rather more complex in their organization than the rest. A System Of Logic, Ratiocinative And Inductive Among monocotyledons this partial development seems to be even more frequent than in dicotyledons. Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants The distinction between dicotyledons and monocotyledons is accurately set forth, though the stress is laid not so much on the cotyledonous character of the seed as on the relation of root and shoot. The Legacy of Greece Essays By: Gilbert Murray, W. R. Inge, J. Burnet, Sir T. L. Heath, D'arcy W. Thompson, Charles Singer, R. W. Livingston, A. Toynbee, A. E. Zimmern, Percy Gardner, Sir Reginald Blomfield The last order of the monocotyledons is composed of marsh or water plants, some of which recall certain of the dicotyledons. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses "A primrose by the river's brim a dicotyledon was to him, and it was nothing more." Platform Monologues "Yes, it sounds funny," said father; "but, you see, the birch tree is dicotyledonous, and so are many weeds, and the dicotyledons look so much alike at first." Stories to Tell Children Fifty-Four Stories With Some Suggestions For Telling The highest apetalous plants contain camphors and oils; the highest of the monocotyledons contain a mucilage and oils; and the highest dicotyledons contain oils and special acids. Scientific American Supplement, No. 623, December 10, 1887 In the dicotyledons root and shoot are represented as springing from the same point, and in monocotyledons from opposite poles in the seed. The Legacy of Greece Essays By: Gilbert Murray, W. R. Inge, J. Burnet, Sir T. L. Heath, D'arcy W. Thompson, Charles Singer, R. W. Livingston, A. Toynbee, A. E. Zimmern, Percy Gardner, Sir Reginald Blomfield The second sub-class of the angiosperms, the dicotyledons, receive their name from the two opposite seed leaves or cotyledons with which the young plant is furnished. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses True dicotyledons appear very much later, in the Cretaceous period, and only in its upper division, if we except a single species from the Urgonian beds of Greenland. Darwinism (1889) Angiosperms are again divided into the monocotyledons, as the palms, and dicotyledons, which include most European trees. The Story of a Piece of Coal What It Is, Whence It Comes, and Whither It Goes The alkaloid35 furnishing families belong, with few exceptions, to the dicotyledons. Scientific American Supplement, No. 623, December 10, 1887 Nothing could be more useful than botany-those who could not distinguish between a dicotyledon and a monocotyledon could certainly never rightly grasp the nature of a hedgerow. Hodge and His Masters The number of the dicotyledons is very large, and very much the greater number of living spermaphytes belong to this group. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Passing on to the Tertiary period the numbers increase, till they reach their maximum in the Miocene, where more than 2000 species of dicotyledons have been discovered. Darwinism (1889) I will describe as examples the reproduction of a moss, a fern, and a dicotyledon. Scientific American Supplement, No. 531, March 6, 1886 The plane of saponin passes from the liliaceæ and allied groups to the rosales and higher dicotyledons. Scientific American Supplement, No. 623, December 10, 1887 "Yes, it sounds funny," said father; "but you see, the birch tree is dicotyledonous, and so are many weeds, and the dicotyledons look much alike at first." Stories to Tell to Children As many of the dicotyledons are trees or shrubs that lose their leaves annually, special leaves are developed for the protection of the young leaves during the winter. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses So, the ferns, lycopods, conifers, and monocotyledons of the palaeozoic and mesozoic rocks, have developed into the marvellous wealth of forms of the higher dicotyledons that now adorn the earth. Darwinism (1889) This description of the analogies of the pollen and embryo-sac of dicotyledons assumes that the general vegetative structure of this class of plants is equivalent to the asexual generation of the higher cryptogams. Scientific American Supplement, No. 531, March 6, 1886 The whole evolution of the monocotyledons from the lowest orders of dicotyledons implies the seeming loss of cambial growth and many other qualities. Species and Varieties, Their Origin by Mutation The ascertained dicotyledons, or higher-class plants, are comparatively few in this formation; but it will be found that they constantly increased as the globe grew older. Vestiges of the Natural History of Creation Nearly all of the dicotyledons may be placed in one of two great divisions distinguished by the character of the petals. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses We measured several leaves of the Artocarpus that were three feet long and eighteen inches broad, remarkable dimensions in a plant of the family of the dicotyledons. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 2 This will bring up the terms dicotyledon and monocotyledon. Outlines of Lessons in Botany, Part I; from Seed to Leaf Sometimes it prevails, and the monocotyledons are obviously a reduced branch of the primitive dicotyledons. Species and Varieties, Their Origin by Mutation The dicotyledons of the coal are comparatively few, though on the present surface they are the most numerous sub-class. Vestiges of the Natural History of Creation Besides the groups already mentioned, there are several families of dicotyledons whose affinities are very doubtful. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Is this not absurd, when the same child can come home from school and talk glibly of a parallelepipedon, a rhombus, rhomboid, polyhedral angle, archipelago, law of primogeniture, the binomial theorem, and of a dicotyledon! The Warriors The parallel-veined leaves of monocotyledons have stems without distinction of wood, bark and pith; the netted-veined leaves of dicotyledons have exogenous stems. Outlines of Lessons in Botany, Part I; from Seed to Leaf The Conifers are not dicotyledons: their seeds contain numerous cotyledons, up to twenty in number, and the whole plant, and especially the reproductive system, belongs to a lower stage of development. The Antiquity of Man We saw many tall graceful palms and tree ferns, but most of the trees were dicotyledons. The Naturalist in Nicaragua In rarely or never becoming perfectly straight, these cotyledons differ remarkably from the ultimate condition of the arched hypocotyls or epicotyls of dicotyledons. The Power of Movement in Plants Among this fossil wood Heer made out the cypress, the silver pine, the poplar, the birch, and some dicotyledons with caducous leaves. Manners and Monuments of Prehistoric Peoples I can see that the simplest cryptogamic are lowest, and I suppose, from their relations, the monocotyledonous come next; but how in the different families of the dicotyledons? More Letters of Charles Darwin — Volume 1 I ask because I often walk out in heavy rain, and the leaves of very few wild dicotyledons can be here seen with drops of water rolling off them like quick-silver. Life and Letters of Charles Darwin — Volume 2 It is often assumed that monocotyledons are descended from some lower group of dicotyledons, probably allied to that which includes the buttercup family. Darwin and Modern Science |
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