| 单词 | monocotyledon |
| 例句 | Desiccation tolerance to survive prolonged drought evolved independently in diverse monocotyledon and eudicotyledon lineages, and is found in at least 300 species. Single-molecule sequencing of the desiccation-tolerant grass Oropetium thomaeum : Nature : Nature Publishing Group 2015-11-10T05:00:00Z As such, it sheds new light on the monocotyledon lineage. The banana (Musa acuminata) genome and the evolution of monocotyledonous plants 2012-08-08T17:21:46.387Z Many monocotyledons do well in peat, even if they do not absolutely require it. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 7 "Horticulture" to "Hudson Bay" 2012-03-04T03:00:13.390Z It is often seen in Wheat and other monocotyledons when the young leaves unfold in cold weather in spring. Disease in Plants 2012-03-01T03:00:22Z In internal structure grass-culms, save in being hollow, conform to that usual in monocotyledons; the vascular bundles run parallel in the internodes, but a horizontal interlacement occurs at the nodes. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z 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 genome also enabled identification of deeply conserved CNS within commelinid monocotyledons and between monocotyledons and eudicotyledons, representing an invaluable resource for detecting novel motifs with a gene regulation function. The banana (Musa acuminata) genome and the evolution of monocotyledonous plants 2012-08-08T17:21:46.387Z 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 monocotyledons yield still more complex fibre aggregates, which are the fibro-vascular bundles of leaves and stems. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 3 "Fenton, Edward" to "Finistere" 2011-03-14T03:01:00.580Z 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 A few palms appeared almost as early, and some other monocotyledons. The Religion of Geology and Its Connected Sciences 2011-02-28T03:00:28.890Z Among the monocotyledons, starch seems to be the characteristic carbohydrate reserve of aquatic, or moisture-loving, species, while inulin is more common among those which prefer dry situations. The Chemistry of Plant Life 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 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 But these plants kept far aloof, in their green depths, from their cogeners the monocotyledons of the terrestrial flora. 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 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 Sometimes, as usually in monocotyledons, the calyx and corolla are similar; in such cases the term perianth, or perigone, is applied. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z In Palæozoic strata the entire want of plants of the most complex organisation is very striking, for not a single dicotyledonous angiosperm has yet been found, and only one undoubted monocotyledon. The World's Greatest Books — Volume 15 — Science 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 monocotyledons comprise many familiar plants, both ornamental and useful. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses No plants have been found containing saponin among the lower monocotyledons. Scientific American Supplement, No. 623, December 10, 1887 In Secondary, or Mesozoic, times, palms and some other monocotyledons appeared; but not till the Upper Cretaceous era do we meet with the principal classes and orders of the vegetable kingdom as now known. The World's Greatest Books — Volume 15 — Science Among monocotyledons a similar increase is not uncommon, as in Tulipa, Allium, Iris, Narcissus, &c. Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants 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 These are the fibro-vascular bundles which in the monocotyledons are of a simple type. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Upon the same evolutionary plane among the monocotyledons, the dates and palms28 contain in large quantities special starches, and this is in harmony with the principles of the theory. Scientific American Supplement, No. 623, December 10, 1887 And such is the milky juice in the centre of the cocoa-nut, and part of the kernel of it; the same I suppose of all other monocotyledon seeds, as of the palms, grasses, and lilies. Zoonomia, Vol. I Or, the Laws of Organic Life The other is a curious, leafless, scandent, monocotyledon. Journals of Travels in Assam, Burma, Bhootan, Afghanistan and the Neighbouring Countries We now come to the true flowering plants, and we first meet with monocotyledons in the Carboniferous and Permian formations. Darwinism (1889) 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 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 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 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 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) They exhibit much greater variety in the structure of the flowers than the monocotyledons, and the leaves, which in the latter are with few exceptions quite uniform in structure, show here almost infinite variety. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses The social plants which almost exclusively predominate in the steppes, are monocotyledons; and it is known how much grasses impoverish the soil into which their fibrous roots penetrate. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 3 Your attention has been directed to the monocotyledons as an example, where retrogression is everywhere so active that it can almost be said to be the prevailing movement. Species and Varieties, Their Origin by Mutation This will bring up the terms dicotyledon and monocotyledon. Outlines of Lessons in Botany, Part I; from Seed to Leaf The parasite monocotyledons take between the tropics the place of the moss and lichens of our northern zone. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1 The underground stems often become much changed, forming bulbs, tubers, root stocks, etc. much as in the monocotyledons. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Zea mays: Sensitiveness of the apex of the Radicle to contact.—A large number of trials were made on this plant, as it was the only monocotyledon on which we experimented. The Power of Movement in Plants 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 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 You and Bentham must hate the monocotyledons, for what work the Orchideae must have been, and Gramineae and Cyperaceae will be. More Letters of Charles Darwin — Volume 2 The first root of the seedling plant continues here as the main root of the plant, as was the case with the gymnosperms, but not with the monocotyledons. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses 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 Retrograde evolution is also typical in the highest and most highly differentiated family of the monocotyledons, the orchids, which have but one or two stamens. Species and Varieties, Their Origin by Mutation The word endogenous, inside-growing, is not, therefore, a correct one to describe the growth of most monocotyledons, for the growth takes place where the leaves originate, near the exterior of the stem. Outlines of Lessons in Botany, Part I; from Seed to Leaf The case described in your last letter of the trimorphic monocotyledon Pontederia is grand. More Letters of Charles Darwin — Volume 2 Breathing pores, of the same type as those in the ferns and monocotyledons, are found on both surfaces, but more abundant and more perfectly developed on the lower surface of the leaf. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses The second order of the monocotyledons, Enantioblastæ, includes very few common plants. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Such groups may be large, as for instance, the monocotyledons, that have their leaves arranged in two opposite rows in many families, or small, as genera or subdivisions of genera. Species and Varieties, Their Origin by Mutation The third order of the monocotyledons, Spadicifloræ, is a very large one, and includes the largest and the smallest plants of the whole sub-class. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses The conditions do not seem very different from the Tuff Galapagos Island, but, as far as I remember, very few monocotyledons there. More Letters of Charles Darwin — Volume 2 The spores do not germinate very readily, and are less favorable for this purpose than those of some other monocotyledons. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses For studying these the most favorable examples for ready demonstration are found in the final division of the pollen spores, especially of some monocotyledons. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Sometimes it prevails, and the monocotyledons are obviously a reduced branch of the primitive dicotyledons. Species and Varieties, Their Origin by Mutation But why, oh, why should so many monocotyledons have come there? or why should they have survived there more than on the main island, if once connected? More Letters of Charles Darwin — Volume 2 But, above everything, such a proportion of individual monocotyledons! More Letters of Charles Darwin — Volume 2 According to Eichler’s classification, the monocotyledons may be divided into seven groups; viz., Elements of Structural and Systematic Botany For High Schools and Elementary College Courses |
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