| 单词 | Ipomoea |
| 例句 | The sweet potato, Ipomoea batatas, is one of the most valuable crops in the world, providing more nutrients per farmed acre than any other staple. All by Itself, the Humble Sweet Potato Colonized the World 2018-04-12T04:00:00Z They identified Ipomoea trifida as the modern crop’s closest living wild relative. Sweet potato migrated to Polynesia thousands of years before people did 2018-04-11T04:00:00Z Both species belong to the family Ipomoea, a large family of some 500 species of annuals and perennials that includes morning glories and sweet potatoes. Prejudicing the lovely moonflower 2015-11-06T05:00:00Z The countryside around Tamazulápam is arid and supports plants of the genera Prosopis, Acacia, Ipomoea, and Cassia, and also columnar cacti. Systematic Status of the Colubrid Snake, Leptodeira discolor Gunther 2011-01-16T03:00:23.960Z On our left, as we went on, the bush was low, all of yellow cassia and white Hibiscus, and tangled with lovely convolvulus-like creepers, Ipomoea and Echites, with white, purple or yellow flowers. Young Folks' Library, Volume XI (of 20) Wonders of Earth, Sea and Sky The closest wild relative is a weedy flower called Ipomoea trifida that grows around the Caribbean. All by Itself, the Humble Sweet Potato Colonized the World 2018-04-12T04:00:00Z He appeared to be attentively watching our sheep, which were feeding by the side of the river, on the Dolichos and Ipomoeas which were growing on the sand. Narrative of the Voyage of H.M.S. Rattlesnake, Commanded By the Late Captain Owen Stanley, R.N., F.R.S. Etc. During the Years 1846-1850. Including Discoveries and Surveys in New Guinea, the Louisiade Archipelago, Etc. to Which Is Added the Account of Mr. E.B. Kennedy's Expedition for the Exploration of the Cape York Peninsula. By John Macgillivray, F.R.G.S. Naturalist to the Expedition. — Volume 2 The Ipomoea Horsfalliae, with its bright scarlet flowers, has a lovely appearance, but must be treated as a stove evergreen. Gardening for the Million Ipomoea leptophylla.—In most of the species of this genus the hypocotyl is well developed, and breaks through the ground as an arch. The Power of Movement in Plants An Ipomoea or two, and a scarlet flowered dwarf Heliconia, kept up the tropic type, as does a stiff brittle fern about two feet high. Young Folks' Library, Volume XI (of 20) Wonders of Earth, Sea and Sky Its water-holes were surrounded by the Nelumbiums of the Mackenzie, and by a fine yellow Ipomoea, with larger flowers than that described as growing at the Mitchell. Journal of an Overland Expedition in Australia : from Moreton Bay to Port Essington, a distance of upwards of 3000 miles, during the years 1844-1845 Diagram showing the mean heights of the crossed and self-fertilised plants of Ipomoea purpurea in the ten generations; the mean height of the crossed plants being taken as 100. Effects of Cross and Self Fertilisation in the Vegetable Kingdom In the many other revolving and twining plants observed by me, I never but twice saw the movement reversed; once, and only for a short space, in Ipomoea jucunda; but frequently with Hibbertia dentata. The Movements and Habits of Climbing Plants The cotyledons of several other species of Ipomoea likewise sink downwards late in the evening. The Power of Movement in Plants Ipomoea purpurea may be quoted as an example. Darwin and Modern Science The rough-leaved fig tree, the white cedar, and a stiff-leaved Ipomoea with pink blossoms, grew on its sandy banks; and some low straggling mangroves at the water's edge. Journal of an Overland Expedition in Australia : from Moreton Bay to Port Essington, a distance of upwards of 3000 miles, during the years 1844-1845 So that the two lots were in fact equal; and a cross of this kind did no more good than crossing two flowers on the same plant of Ipomoea or Mimulus. Effects of Cross and Self Fertilisation in the Vegetable Kingdom The shoots of the Wistaria, which become woody, move faster than those of the herbaceous Ipomoea or Thunbergia. The Movements and Habits of Climbing Plants Ipomoea bona-nox.—The cotyledons after a few days grow to an enormous size, those on a young seedling being 3 1/4 inches in breadth. The Power of Movement in Plants This is evident from his statements, which are models of clearness and precision; he says that his Ipomoea plants "were probably the offspring of a cross." Darwin and Modern Science A pretty yellow Ipomoea formed dense festoons between the trees that fringed the waters. Journal of an Overland Expedition in Australia : from Moreton Bay to Port Essington, a distance of upwards of 3000 miles, during the years 1844-1845 This was manifestly the case with some crossed and self-fertilised plants of Ipomoea, which were suddenly moved from the hothouse to the coldest part of a cool greenhouse. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Ipomoea purpurea—ninth generation: number of capsules on crossed plants to those on self-fertilised plants, spontaneously self-fertilised under a net: 26. Effects of Cross and Self Fertilisation in the Vegetable Kingdom There are, however, some strong exceptions to this rule, as the cotyledons of Gossypium, Anoda and Ipomoea do not possess pulvini, yet continue to move and to grow for a long time. The Power of Movement in Plants It is true that the phenomena observed in self-pollination, e.g. in Ipomoea, agree with those which are often noticed in hybrids; Darwin himself drew attention to this. Darwin and Modern Science In the seventh and eighth generation of Ipomoea, the anthers in the flowers of the self-fertilised plants were plainly smaller than those in the flowers of the intercrossed plants. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Ipomoea purpurea—first generation: seeds per capsule on crossed and self-fertilised plants, not growing much crowded, spontaneously self-fertilised under a net, in number: 99. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Ipomoea purpurea—crossed and self-fertilised flowers on the crossed and self-fertilised plants of the first generation yielded seeds as: 93. Effects of Cross and Self Fertilisation in the Vegetable Kingdom In the case of Ipomoea leptophylla it is the petioles of the cotyledons which become arched whilst rising through the ground; and this occurred spontaneously when the seeds were fixed to the lids of jars. The Power of Movement in Plants Ipomoea purpurea—crossed and self-fertilised flowers on the crossed and self-fertilised plants of the 3rd generation yielded seeds as: 94. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Ipomoea purpurea—crossed and self-fertilised flowers on the crossed and self-fertilised plants of the 4th generation yielded seeds as: 94. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Ipomoea purpurea—seeds per capsule on crossed and self-fertilised plants from the same parents as in the last case, but growing much crowded, spontaneously self-fertilised under a net, in number: 93. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Ipomoea purpurea—crossed and self-fertilised flowers on the crossed and self-fertilised plants of the 5th generation yielded seeds as: 107. Effects of Cross and Self Fertilisation in the Vegetable Kingdom But there were many exceptions to such simplicity of movement; thus the cotyledons of Ipomoea caerulea moved 13 times either upwards or downwards in the course of 16 h.. The Power of Movement in Plants This was apparently the case with the plants of the fifth generation of Ipomoea, and in one of the experiments with Dianthus. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Thus the crossed and self-fertilised plants of Ipomoea, Papaver, Reseda odorata, and Limnanthes were almost equally fertile, yet the former exceeded considerably in height the self-fertilised plants. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Ipomoea purpurea—productiveness of the same plants, as judged by the number of capsules produced, and average number of seeds per capsule: 45. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Secondly, in the sixth self-fertilised generation of Ipomoea a single plant named the Hero appeared, which exceeded by a little in height its intercrossed opponent,—a case which had not occurred in any previous generation. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Thus with different species, and with different individuals of the same species, there were many gradations from a single diurnal movement to oscillations as complex as those of the Ipomoea and Cassia. The Power of Movement in Plants For instance, with Ipomoea purpurea every single intercrossed plant exceeded in height its self-fertilised opponent until the sixth generation; and so it was with Mimulus luteus until the fourth generation. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Ipomoea purpurea, comparison of the height and fertility of the crossed and self-fertilised plants during ten successive generations. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Ipomoea purpurea—third generation: seeds per capsule on crossed and self-fertilised plants, spontaneously self-fertilised under a net, in number: 94. Effects of Cross and Self Fertilisation in the Vegetable Kingdom A plant of Ipomoea purpurea, or as it is often called in England the convolvulus major, a native of South America, grew in my greenhouse. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Thus the movements of the cotyledons of Brassica oleracea and of Ipomoea caerulea, which are not provided with pulvini, are as complex as those of Oxalis and Cassia which are thus provided. The Power of Movement in Plants But the several conclusions which may be deduced from the experiments on Ipomoea will be more fully considered in the final chapters, after all my other observations have been given. Effects of Cross and Self Fertilisation in the Vegetable Kingdom This variety presents a strikingly analogous case to that of the plant called the Hero, which appeared in the sixth self-fertilised generation of Ipomoea. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Ipomoea purpurea—productiveness of the same plants, as judged by the number of capsules produced, and the average number of seeds per capsule: 35. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Digitalis thus differs from Ipomoea, and almost certainly from Mimulus, as with these two species a cross between flowers on the same plant did no good. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Analogous cases with Mimulus and Ipomoea, after several generations of self-fertilisation, have been already given. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Ipomoea purpurea—plants of the tenth generation: 6 : 6 : 44. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Ipomoea purpurea—offspring of plants intercrossed for nine generations and then crossed by a fresh stock, compared with plants of the tenth intercrossed generation: 19 : 84.03 : 19 : 65.78 : 78. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Ipomoea purpurea—fifth generation: seeds per capsule on crossed and self-fertilised plants, left uncovered in the hothouse, and spontaneously fertilised: 89. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Ipomoea purpurea—offspring of plants intercrossed for nine generations and then crossed by a fresh stock, compared with plants of the tenth intercrossed generation, in fertility: .. Effects of Cross and Self Fertilisation in the Vegetable Kingdom The same conclusion holds good, as we have already seen, in the analogous cases of Ipomoea, Mimulus, and Dianthus, with respect to height. Effects of Cross and Self Fertilisation in the Vegetable Kingdom Mimulus and the descendants of Ipomoea named Hero offer instances of this rule. Effects of Cross and Self Fertilisation in the Vegetable Kingdom |
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