| 单词 | pollinium |
| 例句 | The grand prize in the lottery is a packet called a pollinium. Tiny Orchid Seeds Possess Understated Beauty and, Occasionally, Tools 2018-06-16T04:00:00Z As flowers evolved intricate structures to attach pollinia—some orchids stick them smack between the eyes of their favorite insect species, for instance—reproductive barriers likely formed, giving birth to new species. Orchids’ dazzling diversity explained 2015-08-25T04:00:00Z Anthers with short if any scarious tip, borne on the margin of or close under the disk of the stigma; pollinia horizontal. The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee 2012-04-12T02:00:30.140Z Referring to Crüger's letters from Trinidad, he wrote:—"Happy man, he has actually seen crowds of bees flying round Catasetum, with the pollinia sticking to their backs!" Charles Darwin: His Life in an Autobiographical Chapter, and in a Selected Series of His Published Letters 2012-01-22T03:00:19.733Z The seed vessel to be fertilized is very sticky, "but not so viscid as when touched by a pollinium to pull the whole off an insect's head." The Relations of Science and Religion The Morse Lecture, 1880 2011-09-11T02:00:11.613Z The number of pollinia varies; thus, in Orchis there are usually two, in Cattleya four, and in Laelia eight. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z Indeed, in lineages that have pollinia, the speciation rate was 5.1% higher than in lineages that don’t, Givnish and colleagues report this week in the Proceedings of the Royal Society B. Orchids’ dazzling diversity explained 2015-08-25T04:00:00Z Anthers tipped with an inflexed or sometimes erect scarious membrane, the cells lower than the top of the stigma; pollinia suspended. The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee 2012-04-12T02:00:30.140Z Pollen, a pair of pollinia of a Milkweed, Asclepias, attached by stalks to a gland; moderately magnified. The Elements of Botany For Beginners and For Schools In either case the change of position in the pollinia would insure the same result. My Studio Neighbors The two pollinia in Orchis Morio contain each about 200 secondary smaller masses. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z On the proboscis being withdrawn, the two pollinia stand erect and parallel, firmly attached to the proboscis. Darwinism (1889) The hawk-moth removes on its tongue one, but not often both, of the pollinia attached to disks on either side of the entrance to the spur. Wild Flowers An Aid to Knowledge of Our Wild Flowers and Their Insect Visitors Some of the packets or partial pollinia, of which Fig. The Elements of Botany For Beginners and For Schools This reminds me that I carefully described to Huxley the shooting out of the pollinia in Catasetum, and received for an answer, "Do you really think that I can believe all that!" More Letters of Charles Darwin — Volume 2 Is it not curious the way the labellum sits on the top of the column?—here insects alight and are beautifully shot, when they touch a certain sensitive point, by the pollinia. More Letters of Charles Darwin — Volume 1 The pollinia are by this means transported by insects from one flower to the stigma of another. The Origin of Species by means of Natural Selection, 6th Edition Only visitors long of limb can easily remove the pollinia, which are usually found dangling from the hairs of their legs. Wild Flowers An Aid to Knowledge of Our Wild Flowers and Their Insect Visitors In the latter position, if the insect visited another flower, the pollinium would exactly hit the sticky stigmatic surface and thus effect fertilisation. Darwin and Modern Science The clinandrum is largely developed in Malaxis, and is of considerable importance in retaining the pollinia, which as soon as the flower opens are quite loose. More Letters of Charles Darwin — Volume 2 He has seen lots of great humble-bees buzzing about the flowers with the pollinia sticking to their backs! More Letters of Charles Darwin — Volume 2 In this latter case we have a pollinium in its most highly developed and perfect condition. The Origin of Species by means of Natural Selection, 6th Edition Large butterflies like Danais," says Professor Robertson, "hold their wings still in sucking, spending more time on an umbel, but generally carrying pollinia. Wild Flowers An Aid to Knowledge of Our Wild Flowers and Their Insect Visitors The anthers have only rudimentary pollinia and do not open; there are no antennae, but on the other hand numerous seeds are produced. Darwin and Modern Science I found the other day a lot of bee-Ophrys with the glands of the pollinia all in their pouches. More Letters of Charles Darwin — Volume 2 At the base of the pedicel is a small viscid disc by which the pollinium is attached to the head or proboscis of one of the insects which visit the flower. Darwin and Modern Science As I have fully treated this subject in another work, I will here give only a few details on one alone of the most striking peculiarities of the flowers of orchids, namely, their pollinia. The Origin of Species by means of Natural Selection, 6th Edition So many orchids fasten their pollinia upon the faces and tongues of insects that it is interesting to find one which applies them regularly to the first abdominal segment. Wild Flowers An Aid to Knowledge of Our Wild Flowers and Their Insect Visitors The pollen, or more correctly, the pollen-tetrads, remain fastened together as club-shaped pollinia usually borne on a slender pedicel. Darwin and Modern Science In regard to the other four flowers, I may remark that though similarly fertilised—part having pollinia inserted, others merely attached—they all withered and dropped off without the least swelling of the ovary. More Letters of Charles Darwin — Volume 2 Darwin demonstrated that in Orchis and other flowers the pedicel of the pollinium, after its removal from the anther, undergoes a curving movement. Darwin and Modern Science If the pollinium was originally vertical, after a time it assumed a horizontal position. Darwin and Modern Science Species of Augochlora are the only insects on which I found pollinia. Wild Flowers An Aid to Knowledge of Our Wild Flowers and Their Insect Visitors |
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