| 单词 | Drosera |
| 例句 | He said he cared more about the genus Drosera, which means dewy in Latin, than the origin of all the species in the world. Meat-eating plants making a comeback in England 2019-09-03T04:00:00Z As they report in Plant Species Biology, the petals of Drosera tokaiensis and Drosera spatulate fold up within two to 10 minutes after parts of their stem, calyx, or closed flowers are pressed with tweezers. Meat-Eating Plant Found Stealing Bugs From Its Neighbors 2018-03-05T05:00:00Z In his work on the carnivorous sundew plant Drosera rotundifolia, for instance, he generated several predictions to test his hypothesis that it trapped insects to obtain nitrogen. Evolution: Darwin's domestic discoveries : Nature : Nature Research 2017-08-22T04:00:00Z Ninety new species of Begonia were also uncovered, as were five new species of onion and a sprawling, insect-eating plant called Drosera magnifica in Brazil, which was first spotted on Facebook. Kew report makes new tally for number of world's plants - BBC News 2016-05-09T04:00:00Z With stems reaching five feet long, Drosera magnifica practically qualifies for a turn on “Little Shop of Horrors” and is the largest sundew species in the Americas. Plants That Are Predators 2015-09-14T04:00:00Z One was cured with Aviaire 6th and strong doses of Sulphate of Quinine, and the other with Aviaire 6th and twenty drops of Tincture of Drosera, a day. New, Old, and Forgotten Remedies: Papers by Many Writers 2012-02-05T03:00:10Z He notes in his diary that the last proof of the Expression of the Emotions was finished on August 22, 1872, and that he began to work on Drosera on the following day. Charles Darwin: His Life in an Autobiographical Chapter, and in a Selected Series of His Published Letters 2012-01-22T03:00:19.733Z Drosera�ce�, a nat. ord. of polypetalous Dicotyledons, consisting of insectivorous marsh herbs, whose leaves are usually covered with glands or glandular hairs. The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde 2011-04-14T02:00:57.977Z Different Forms of Flowers," he said, "I am all on fire at the work;" and of "Insectivorous Plants," "I have been working like a madman at Drosera. Famous Men of Science 2011-03-08T03:00:49.717Z He compared the glistening and gothically tentacled sundew plant, or Drosera, to a “most sagacious animal” and said, “I will stick up for Drosera to the day of my death.” Plants That Are Predators 2015-09-14T04:00:00Z The upper face of the leaves of the common species of Drosera, or Sundew, is beset with stout bristles, having a glandular tip. The Elements of Botany For Beginners and For Schools In cases where, as in the case of ——'s experiments on Drosera, he thought lightly of the author, he speaks of him in such a way that no one would suspect it. Charles Darwin: His Life in an Autobiographical Chapter, and in a Selected Series of His Published Letters 2012-01-22T03:00:19.733Z We do not hesitate to class amongst vegetables the Drosera, the Dionaea, the Pinguicula, which are insectivorous plants. Creative Evolution The contrivance in Utricularia and Dionæa, and in fact in Drosera too, seems fully as great and complex as in Orchids, but there is not the same motive force. Alfred Russel Wallace: Letters and Reminiscences, Vol. 1 I have no doubt that this elastic and wiry action is partly connected with the plant's more or less predatory or fly-trap character, in which these curiously degraded plants are associated with Drosera. Proserpina, Volume 2 Studies Of Wayside Flowers The most striking cases are those of Drosera and Dion�a; for an account of which see "How Plants Behave," and Goodale's "Physiological Botany." The Elements of Botany For Beginners and For Schools I am now hard at work getting my book on Drosera & Co. ready for the printers, but it will take some time, for I am always finding out new points to observe. Charles Darwin: His Life in an Autobiographical Chapter, and in a Selected Series of His Published Letters 2012-01-22T03:00:19.733Z Drosera rotundifolia.—Very common on marshy commons, and is said to be poisonous to sheep, and to give them the disease called the rot. The Botanist's Companion, Volume II Drosera, which Jussieu associates with these genera is generally diffused, being found within the tropic, at Endeavour River, and on the North-west Coast; at Port Jackson, and at the southern extremes of Van Diemen's Land. Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 2 Claude Bernard has demonstrated the community which exists between animals and vegetables—phenomena of movement, of sensibility, of production of heat, of respiration, of digestion even, for there are the Drosera and kindred carnivorous plants. Scientific American Supplement, No. 303, October 22, 1881 See Dypsacus and Drosera; the flowers of Siléne and Cucúbalus are closed all day, but are open and give an agreeable odour in the night. The Botanic Garden. Part II. Containing the Loves of the Plants. a Poem. With Philosophical Notes. Ammonia, salts of, behaviour of the leaves of Drosera, towards, 320. Charles Darwin: His Life in an Autobiographical Chapter, and in a Selected Series of His Published Letters 2012-01-22T03:00:19.733Z In the summer of 1860, I was idling and resting near Hartfield, where two species of Drosera abound; and I noticed that numerous insects had been entrapped by the leaves. Darwiniana : Essays — Volume 02 Nor could their complete dissolution have been expected from what we have seen with Drosera. Insectivorous Plants We have an analogous case of transmission in Drosera, for when a gland is irritated, the basal and not the upper or intermediate part of the tentacle bends. The Power of Movement in Plants Recovery of Forgotten Knowledge and History of what was known of Dionzea, Drosera, and Sarracenia. Darwiniana; Essays and Reviews Pertaining to Darwinism Mamma, look! this is the Drosera rotundifolia I have been wanting so long.' Wives and Daughters Lathyrus nissolia seems to be in an incipient transitional state, as does Drosera Anglica, the flowers of which are not perfectly closed. The Different Forms of Flowers on Plants of the Same Species It is thus evident that the glands of Pinguicula absorb carbonate of ammonia; but they do not absorb it, or are not acted on by it, nearly so quickly as those of Drosera. Insectivorous Plants Drosera rotundifolia is one of the few plants the leaves of which exhibit no trace of heliotropism. The Power of Movement in Plants The result is much the same to the insect, whether captured in the trap of Dionaea or stuck fast to the limed bristles of Drosera. Darwiniana; Essays and Reviews Pertaining to Darwinism The latter I want about some strange movements in cells of Drosera, which Meyen alone seems to have observed. More Letters of Charles Darwin — Volume 2 Vaccinium, Andromeda, Gaultheria, Hypericum, Drosera, Habenaria, inhabit these mountains, and I look at this almost as good evidence of a cold period, as glacial action. More Letters of Charles Darwin — Volume 1 These observations were made subsequently to those on Drosera, Dionaea, Drosophyllum, and Pinguicula; so that I was familiar with the appearance of these substances when undergoing the early and final stages of digestion. Insectivorous Plants But this degree of sensitiveness is as nothing compared with that of the glands of Drosera, for these are excited by particles weighing only 1/78740 of a grain. The Power of Movement in Plants At fifteen minutes past ten of the same day I placed bits of raw beef on some of the most vigorous leaves of Drosera longifolia. Darwiniana; Essays and Reviews Pertaining to Darwinism I should very much wish to talk over Drosera with you. More Letters of Charles Darwin — Volume 2 July and again in September: Made observations on Drosera. More Letters of Charles Darwin — Volume 1 A further slight change would convert the linear leaves of this latter species into the oblong leaves of Drosera anglica, and these might easily pass into orbicular ones with footstalks, like those of Drosera rotundifolia. Insectivorous Plants With Drosera two, and with Lupinus, Eucalyptus and Pancratium, several were formed each day. The Power of Movement in Plants While Dionaea is as local in habitation as it is singular in structure and habits, the Droseras or sundews are widely diffused over the world and numerous in species. Darwiniana; Essays and Reviews Pertaining to Darwinism I shall work away next summer when Drosera opens again, for I am much interested in subject. More Letters of Charles Darwin — Volume 2 In this respect they present a wonderful contrast with Drosera, owing no doubt to the presence of absorbent glands in the latter plant. The Movements and Habits of Climbing Plants Under this point of view we should bear in mind that the summits of the tentacles of Drosera, close beneath the glands, are sensitive. Insectivorous Plants Here then we have a case of specialised sensibility, like that of the glands of Drosera; for these are exquisitely sensitive to the slightest pressure if prolonged, but not to two or three rough touches. The Power of Movement in Plants In several saxifrages—not very distant relatives of Drosera—the viscid glands equally manifested the power of absorption. Darwiniana; Essays and Reviews Pertaining to Darwinism By Jove, I sometimes think Drosera is a disguised animal! More Letters of Charles Darwin — Volume 2 Perhaps the nearest analogy may be found in such plants as Drosera and Dionaea; for here animal matter is digested and converted into peptone not within a stomach, but on the surfaces of the leaves. The formation of vegetable mould through the action of worms, with observations on their habits Gluten, therefore, excites the glands greatly, but is dissolved with much difficulty, exactly as in the case of Drosera. Insectivorous Plants In August he wrote to the same friend:— "I will gratefully send my notes on Drosera when copied by my copier: the subject amused me when I had nothing to do." Life and Letters of Charles Darwin — Volume 2 In cases where, as in the case of —'s experiments on Drosera, he thought lightly of the author, he speaks of him in such a way that no one would suspect it. Life and Letters of Charles Darwin — Volume 1 In our Drosera the filaments are not sensitive to a slight touch, but are sensitive to prolonged pressure from the smallest object of any nature; they are also sensitive to solid or fluid nitrogenous matter. More Letters of Charles Darwin — Volume 2 "I cannot avoid the conclusion, that Drosera possesses matter at least in some degree analogous in constitution and function to nervous matter." Darwin and Modern Science Changes of this nature are, however, far more rapid in Drosera than in Utricularia. Insectivorous Plants I will stick up for Drosera to the day of my death. Life and Letters of Charles Darwin — Volume 2 He speaks in one of his letters of his intention of working at Drosera as a rest from the 'Descent of Man.' Life and Letters of Charles Darwin — Volume 1 I wish some facts on the action of water, because I have been so surprised at a stream not acting on Dionoea and Drosera. More Letters of Charles Darwin — Volume 2 In the tentacles of Drosera the aggregated masses of protoplasm, which appeared killed by the quinine, likewise presented a granular appearance. Insectivorous Plants These results led me to inquire whether Drosera possessed the power of dissolving solid animal matter. Insectivorous Plants After the publication of the second edition he began at once, on January 9th, looking over his materials for the 'Variation of Animals and Plants;' the only other work of the year was on Drosera. Life and Letters of Charles Darwin — Volume 2 We may conclude that a small dose of camphor in solution is a powerful stimulant to Drosera. Insectivorous Plants It causes the flowers of the bedding-out Mesembryanthemum and Drosera to close, but it has not this effect on Gazania and the daisy, so I can make out no rule. More Letters of Charles Darwin — Volume 2 The poison of the cobra is most deadly to animals, by paralysing their nerve-centres,* yet is not in the least so to Drosera, though quickly causing strong inflection. Insectivorous Plants Although these filaments are so sensitive to a momentary and delicate touch, they are far less sensitive than the glands of Drosera to prolonged pressure. Insectivorous Plants My dear Dr. Sanderson, I should like to tell you a little about my recent work with Drosera, to show that I have profited by your suggestions, and to ask a question or two. Life and Letters of Charles Darwin — Volume 2 Again, various metallic salts and acids, namely those of silver, mercury, gold, tin, arsenic, chromium, copper, and platina, most or all of which are highly poisonous to animals, are equally so to Drosera. Insectivorous Plants I said that I had been wishing to write to you, and this was about your Drosera, which after many fluctuations between life and death, at last made a shoot which I could observe. More Letters of Charles Darwin — Volume 2 Vapour of Chloroform.—The action of this vapour on Drosera is very variable, depending, I suppose, on the constitution or age of the plant, or on some unknown condition. Insectivorous Plants No doubt, as in the case of Drosera, the plant is indifferent to the heaviest shower of rain. Insectivorous Plants It is really beautiful how quickly and well Drosera and Dionaea dissolve little cubes of albumen and gelatine. Life and Letters of Charles Darwin — Volume 2 It is evident that this oil is highly exciting and poisonous to Drosera. Insectivorous Plants It is very curious, but Trecul disbelieves that Drosera really clasps flies! More Letters of Charles Darwin — Volume 2 These are, perhaps, the most interesting of all my observations on Drosera, as no such power was before distinctly known to exist in the vegetable kingdom. Insectivorous Plants In this respect Dionaea differs from Drosera, which catches and digests many insects after shorter intervals of time. Insectivorous Plants For Utricularia is a carrion-feeder, and not strictly carnivorous like Drosera. Life and Letters of Charles Darwin — Volume 2 But, as before remarked, a special pharmacopoeia would be necessary to describe the diversified effects of various substances on the leaves of Drosera. Insectivorous Plants You know that I always so like telling you what I do, that you must forgive me scribbling on my beloved Drosera. More Letters of Charles Darwin — Volume 2 The tentacles of Drosera, after their glands have been repeatedly touched, or a particle of any kind has been placed on them, become inflected and strongly aggregated. Insectivorous Plants There is another difference in function between the glands of these two plants: we know that the glands of Drosera secrete more copiously when properly excited. Insectivorous Plants The reason why I am so anxious on this head is that it gives some support to certain facts repeatedly observed by me with respect to the action of phosphate of ammonia on Drosera. Life and Letters of Charles Darwin — Volume 2 These underwent incessant slow changes of forms; sometimes separating from one another and then reuniting, exactly as in the cells of Drosera. Insectivorous Plants I have repeated my experiment on digestion in Drosera with complete success. More Letters of Charles Darwin — Volume 2 The gastric juice of animals contains, as is well known, an acid and a ferment, both of which are indispensable for digestion, and so it is with the secretion of Drosera. Insectivorous Plants The most interesting case for us is that of the two species of Saxifraga, as this genus is distantly allied to Drosera. Insectivorous Plants The work was continued until April 1, 1874, when he was able to return to his much loved Drosera. Life and Letters of Charles Darwin — Volume 2 The substances which are digested by Drosera act on the leaves very differently. Insectivorous Plants I do not think any discovery gave me more pleasure than proving a true act of digestion in Drosera. More Letters of Charles Darwin — Volume 2 But as far as I have seen— and I made many trials—the sides of the leaf are never inflected, and this is the one functional difference between this species and Drosera rotundifolia. Insectivorous Plants On the other hand, hydrochloric acid is not poisonous either to animals or to Drosera, and induces only a moderate amount of inflection. Insectivorous Plants It differs from Drosera anglica, as far as the leaves are concerned, only in their smaller size, and in their tips being generally a little reflexed. Insectivorous Plants The secretion is almost colourless, slightly mucilaginous, and, judging by the manner in which it coloured litmus paper, more strongly acid than that of Drosera. Insectivorous Plants Now in your Drosera the filaments are not sensitive to a rough touch or to any pressure from non-nitrogenous matter, but are sensitive to solid or fluid nitrogenous matter. More Letters of Charles Darwin — Volume 2 Concluding Remarks.—From what we have now seen, there can be little doubt that most or probably all the species of Drosera are adapted for catching insects by nearly the same means. Insectivorous Plants This seemed the more necessary as the leaves of some of the species differ to an extraordinary degree in shape from the rounded ones of Drosera rotundifolia. Insectivorous Plants They stand on very short pedicels, into which spiral vessels do not enter, in which respect they differ from the tentacles of Drosera. Insectivorous Plants In all these respects the filaments of Dionaea behave exactly like the tentacles of Drosera. Insectivorous Plants Pfeffer shows that in some cases—Drosera, for instance—water produces movement only when it contains fine particles in suspension. More Letters of Charles Darwin — Volume 2 The so-called earthy salts produce hardly any effect on Drosera. Insectivorous Plants These organs I shall call tentacles, from their close resemblance to those of Drosera, though they have no power of movement. Insectivorous Plants Here, again, as in the case of albumen, the digestive process seems slower than in Drosera. Insectivorous Plants As cartilage is so tough a substance and is so little acted on by water, its prompt dissolution by the secretion of Drosera, and subsequent absorption is, perhaps, one of the most striking cases. Insectivorous Plants It is pretty to see how the caught flies support Drosera; nothing else can live. More Letters of Charles Darwin — Volume 2 The glands of all the tentacles have the same structure, so that the extreme marginal ones do not differ from the others, as in the case of Drosera rotundifolia. Insectivorous Plants This is certainly the case with Drosera, Drosophyllum, and Dionaea; almost certainly with Aldrovanda; and, from analogy, very probable with Roridula and Byblis. Insectivorous Plants Drosera binata presents another and more remarkable peculiarity, namely, the presence of a few tentacles on the backs of the leaves, near their margins. Insectivorous Plants Boiling water makes the contents of the gland-cells white and opaque, but not so purely white and porcelain-like as in the case of Drosera. Insectivorous Plants There is a partial error at page 8, where you say that Drosera is nearly indifferent to organic substances. More Letters of Charles Darwin — Volume 2 Drosera, on the other hand, lives chiefly on insects which are good flyers, especially Diptera, caught by the aid of its viscid secretion. Insectivorous Plants Judging from the analogy of Drosera, the heat in these several cases was too great and too suddenly applied. Insectivorous Plants We have seen that boiling water in like manner causes the tentacles of Drosera to curve backwards; and this is an analogous movement to the divergence of the lobes of Dionaea. Insectivorous Plants Milk, however, which acts so energetically on Drosera, seems rather less effective on Drosophyllum, for the glands were only slightly darkened by an immersion of 1 hr. Insectivorous Plants We may, therefore, conclude that the ferment of Drosera is closely analogous to, or identical with, the pepsin of animals. Insectivorous Plants Benzoic acid, which is innocuous to animals, seems to be as poisonous to Drosera as hydrocyanic. Insectivorous Plants In all these cases the glands are affected in exactly the same manner as those of Drosera. Insectivorous Plants The apex of the leaf curls over an exciting object as in the case of Drosera anglica. Insectivorous Plants The glands of the extreme marginal tentacles are elongated and differ from the others, as in the case of Drosera rotundifolia. Insectivorous Plants I therefore placed two little square bits of the blade of a cabbage-leaf, and four little cubes cut from the midrib, on six leaves of Drosera. Insectivorous Plants Gastric juice, therefore, apparently agrees in this respect with the secretion of Drosera. Insectivorous Plants But glands of this kind are present on the leaves of Drosera binata, and appear to be represented by the papillae on the leaves of Drosera rotundifolia. Insectivorous Plants After 19 hrs. the slice on the leaf of Drosera was bathed in much secretion from the inflected tentacles, and was now examined under the microscope. Insectivorous Plants In the case of Drosera there is certainly much movement of the fluid throughout the tentacles whilst they are undergoing inflection. Insectivorous Plants It should, however, be observed that curare, colchicine, and veratrine are muscle-poisons—that is, act on nerves having some special relation with the muscles, and, therefore, could not be expected to act on Drosera. Insectivorous Plants But a pharmacopoeia would be requisite to describe the diversified effects of various substances on Drosera. Insectivorous Plants The digestive process apparently is rather slower than in Drosera, and this agrees with the length of time during which the leaves remain closed over digestible objects. Insectivorous Plants Propionic acid is highly poisonous to Drosera, like its ally acetic acid, but induces inflection at a much slower rate. Insectivorous Plants On the whole, it seems that the poison of the cobra acts far more injuriously on the protoplasm of the higher animals than on that of Drosera. Insectivorous Plants The secretion of Drosera and gastric juice were both able to dissolve some element or impurity out of the globulin and haematin employed by me. Insectivorous Plants Again, fibro-cartilage, though not properly dissolved, is acted on in the same manner, both by the secretion of Drosera and gastric juice. Insectivorous Plants The meat was thus in the same state as that formerly described, which was half digested by Drosera. Insectivorous Plants So that here we have another point of accordance between the secretion of Drosera and gastric juice, as both act so differently on the fresh casein of milk, and on that prepared by chemists. Insectivorous Plants Hence we are, I think, justified in believing that gelatine, areolar tissue, and the fibrous basis of bone, would be far less nutritious to Drosera than such substances as insects, meat, albumen, &c. Insectivorous Plants As soon as these eight leaves re-expanded, they were given bits of roast meat, and in some hours all became greatly inflected; again showing how much more meat excites Drosera than does gelatine or isinglass. Insectivorous Plants Nothing more need be said about some of the above enumerated substances, excepting that they were repeatedly tried on the leaves of Drosera, and were not in the least affected by the secretion. Insectivorous Plants At some of these points of union the vessels form curious loops, like those described under Drosera. Insectivorous Plants There is, therefore, a remarkable parallelism between the glands of Drosera and those of the stomach in the secretion of their proper acid and ferment. Insectivorous Plants THE chief object in this chapter is to show how powerfully the salts of ammonia act on the leaves of Drosera, and more especially to show what an extraordinarily small quantity suffices to excite inflection. Insectivorous Plants My son Francis placed a thin slice of spinach leaf, moistened with saliva, on a leaf of Drosera, and other slices on damp cotton-wool, all exposed to the same temperature. Insectivorous Plants The glands of Drosera absorb matter from living seeds, which are injured or killed by the secretion. Insectivorous Plants On the other hand, the glands of Drosera may be struck with a needle or any hard object, once, twice, or even thrice, with considerable force, and no movement ensues. Insectivorous Plants In the table at the head of this discussion, the salts are arranged according to their chemical affinities; but their action on Drosera does not seem to be thus governed. Insectivorous Plants The leaves of Drosera contain an acid, and perhaps a difference in the amount contained may account for the slight differences in the results above recorded. Insectivorous Plants Fibro-cartilage is therefore acted on in nearly the same manner by gastric juice and by the secretion of Drosera. Insectivorous Plants Substances which are completely or partially digested by the Secretion of Drosera. Insectivorous Plants These have the power both of secretion and absorption; but unlike those of Drosera, they do not secrete until excited by the absorption of nitrogenous matter. Insectivorous Plants But this is explained in the following statement, and we further see how closely similar is the process of digestion by gastric juice and by the secretion of Drosera. Insectivorous Plants These swelled and became hyaline, exactly like those exposed to the secretion of Drosera, but were not dissolved. Insectivorous Plants During very warm weather I placed close together two equal-sized bits of raw meat, one on a leaf of the Drosera, and the other surrounded by wet moss. Insectivorous Plants I shall also have occasion hereafter to refer to a paper by Mrs. Treat, of New Jersey, on some American species of Drosera. Insectivorous Plants There is a great contrast between Drosera and Dionaea in the effects produced by mechanical irritation on the one hand, and the absorption of animal matter on the other. Insectivorous Plants Yet the cells of the glands of Drosera are thus excited to transmit a motor impulse to a distant point, inducing movement. Insectivorous Plants We shall find that Drosera resists heat somewhat better than most other plants. Insectivorous Plants It appears that cold-blooded animals are, as might have been expected, far more sensitive to an increase of temperature than is Drosera. Insectivorous Plants IN my observations on Drosera rotundifolia, the leaves seemed to be more quickly inflected over animal substances, and to remain inflected for a longer period during very warm than during cold weather. Insectivorous Plants Hence we may infer that Drosera cannot obtain phosphorus from the phosphate of potash. Insectivorous Plants I suspect from the number of insects caught by the English species of Drosera, and from what I have observed with some exotic species kept in my greenhouse, that the odour is attractive. Insectivorous Plants There is also an interesting though short account of the habits of Drosera by Dr. Milde, in the 'Bot. Insectivorous Plants Of the six genera, Drosera has been incomparably the most successful in the battle for life; and a large part of its success may be attributed to its manner of catching insects. Insectivorous Plants A gland of Drosera may be forcibly hit once, twice, or even thrice, without any effect being produced, whilst the continued pressure of an extremely minute particle excites movement. Insectivorous Plants This solution was so weak that it only just tasted acid, yet, as we shall see, was highly poisonous to Drosera. Insectivorous Plants The sensitive organs of Drosera and Dionaea are also specialised, so as not to be uselessly affected by the weight or impact of drops of rain, or by blasts of air. Insectivorous Plants However this may be, we have seen that the glands on the same leaf of Drosera are sometimes very unequally affected, more especially when exposed to certain vapours. Insectivorous Plants The case of urea is particularly interesting, because we have seen that it produces no effect on Drosera, the leaves of which are adapted to digest fresh animal matter. Insectivorous Plants The movements were, in short, exactly like those described in the case of Drosera. Insectivorous Plants But it would be an endless task to endeavour to ascertain the wonderfully diversified effects of various solutions on Drosera. Insectivorous Plants The small sessile glands have also disappeared in some of the genera, being replaced in Roridula by hairs, and in most species of Drosera by absorbent papillae. Insectivorous Plants Drosera binata, with its linear and bifurcating leaves, is in an intermediate condition. Insectivorous Plants The glands, however, absorb very much more slowly than those of Drosera. Insectivorous Plants |
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