Anthers sentence example

anthers
  • The anthers are so situated that the pollen on escaping comes into contact with the stigma; in such flowers self-fertilization is compulsory and very effectual, as seeds in profusion are produced.
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  • The flowers are borne in a terminal raceme, the anthers open introrsely and the fruit is a capsule, very rarely, as in Dianella, a berry.
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  • Schinzia, which forms galllike swellings on the roots of rushes; Gymnosporangium, causing excrescences on juniper stems; numerous leaf Fungi such as Puccinia, Aecidium, Sep/one, &c., causing yellow, brown or black spots on leaves; or Ustilago in the anthers of certain flowers.
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  • Spontaneous self-pollination is rendered impossible in some homogamous flowers in consequence of the relative position of the anthers and stigma - this condition has been termed herkogamy.
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  • Flowers which are closed at the time of maturity of anthers and stigmas are termed cleistogamous.
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  • Thus the species' of wheat are usually selffertilized, but cross-fertilization is possible since the glumes are open above, the stigmas project laterally, and the anthers empty only about one-third of their pollen in their own flower and the rest into the air.
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  • A single male flower consists of an axis enclosed at the base by an inconspicuous perianth formed of two concrescent leaves and terminating in two, or as many as eight, shortly stalked or sessile anthers.
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  • A male flower consists of a single angular perianth, through the open apex of which the flower-axis projects as a slender column terminating in two anthers.
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  • These contain three stamens with thread-like filaments and oblong, two-lobed anthers.
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  • The stamens of the wheat plant may frequently be seen protruding beyond the glumes, and their position might lead to the inference that cross-fertilization was the rule; but on closer examination it will be found that the anthers are empty or nearly so, and that they are not protruded till after they have deposited the pollen upon the stigma.
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  • The glumes have to be separated and the anthers cut away before the pollen is fully formed, care being taken at the same time not to injure the stigma, and specially not to introduce, on the scissors or otherwise, any pollen except that of the variety desired.
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  • Changes are produced in the whorl of stamens by cohesion of the filaments to a greater or less extent, while the anthers remain free; thus, all the filaments of the androecium may unite, forming a tube round the pistil, or a central bundle when the pistil is abortive, the stamens becoming monadelphous, as occurs in plants of the Mallow tribe; or they may be arranged in two bundles, the stamens being diadelphous, as in Polygala, Fumaria and Pea; in this case the bundles may be equal or unequal.
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  • The stamens may cohere by their anthers, and become syngenesious, as in composite flowers, and in lobelia, jasione, &c.
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  • The opening or dehiscence of the anthers to discharge their contents takes place either by clefts, by valves, or by pores.
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  • The anthers dehisce at different periods during the process of flowering; sometimes in the bud, but more commonly when the pistil is fully developed and the flower is expanded.
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  • The anthers are called introrse when they dehisce by the surface next to the centre of the flower; they are extrorse when they dehisce by the outer surface; when they dehisce by the sides, as in Iris and some grasses, they are laterally dehiscent.
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  • Sometimes, from their versatile nature, anthers originally introrse become extrorse, as in the Passionflower and Oxalis.
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  • The usual colour of anthers is yellow, but they present a great variety in this respect.
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  • They are red in the peach, dark purple in the poppy and tulip, orange in Eschscholtzia, &c. The colour and appearance of the anthers often change after they have discharged their functions.
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  • Stamens occasionally become sterile by the degeneration or non-development of the anthers, when they are known as staminodia, or rudimentary stamens.
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  • The length of the style is determined by the relation which should subsist between the position of the stigma and that of the anthers, so as to allow the proper application of the pollen.
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  • In Asclepiadaceae the stigmas are united to the face of the anthers, and along with them form a solid mass.
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  • Spring squill has blue anthers, these are the parts on the ends of the stamens which carry the pollen grains.
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  • I have only just noticed that the filaments, holding the anthers, are covered in fine brown hairs.
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  • The moment the flower opens, on the plant chosen to be female, snip off the pollen covered anthers.
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  • The image on the left shows three yellow anthers at the tips of perianth segments.
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  • The lilac blue flowers are a good shape, large and with wonderful contrasting anthers of butter yellow.
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  • Under the microscope, dark-ground illumination reveals the details of one of the darker anthers and its filament.
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  • The color is shaded, paler pink at the circumference becoming deeper magenta toward the center, with dark veins and red anthers.
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  • Below this there are black anthers on red filaments.
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  • The male anthers are clearly visible, the stigma is beneath them, half way up the flower tube.
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  • Flowers have white to greenish corollas and purple anthers and filaments.
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  • Sarcococca hookeriana var. digyna AGM has slender, tapered leaves and the male flowers have cream anthers.
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  • These flowers hang upside down on the end of long peduncles, so the anthers are symmetrical.
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  • Rosebay willow-herb Chamerion angustifolium; male stage When the flower opens the anthers are beginning to mature and shed pollen.
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  • The five stamen with anthers match the five sacred wounds & the three stigma the nails.
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  • The flowers blue, 1 inch across, with a white throat and yellow anthers.
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  • The fragrant flowers, which have primrose-colored petals and red anthers, come in April.
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  • The flowers, 2 to 3 inches in diameter, are pure white, with a bunch of yellow anthers in the centre; several borne on stems about 1 foot high.
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  • In H. japonica the flowers are larger, but only two or three on a stalk, their color a deep rose with blue anthers.
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  • The falls are deep violet-purple, with a beardless bright yellow keel, from which are purplish branchings, whilst the standards are pale self-lilac with creamy anthers.
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  • In purpureo-coerulea the ovary and base of the segments are rosy-purple, gradually merging into blue, which becomes intense towards the tips, harmonising with the black and gold-banded anthers.
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  • Kniphofia Comosa - Seems closely allied to K. pumila, and has a peculiar appearance with its long protruding style and anthers.
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  • They are of glistening purity, fragrant, and very full of petals guarding the cluster of golden anthers.
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  • Within the perianth, and springing from its sides, or apparently from the top of the ovary, are six stamens whose anthers contain pulverulent pollen-grains.
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  • Some or all of the anthers become twisted so that insects in probing for honey will touch the anthers with one side of their head and the capitate stigma with the other.
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  • Owing, however, to the close proximity of stigma and anthers, very slight irregularity in the movements of the visiting insect will cause self-pollination, which may also occur by the dropping of pollen from the anthers of the larger stamens on to the stigma.
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  • The anthers shed their pollen into this groove, either of themselves or when the pistil is shaken by the insertion of the bee's proboscis.
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  • Bulbous plants with a terminal racemose inflorescence; the anthers open introrsely and the capsule is loculicidal.
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  • The plants generally have an erect stem with a crown of leaves which are often leathery; the anthers open introrsely and the fruit is a berry or capsule.
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  • The slender filaments of the stamens vary widely, often in the same flower; the anthers are linear to ovate in shape, attached at the back to the filament, and open lengthwise.
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  • He states that the germ is never to be seen in the seed till the apices (anthers) shed their dust; and that if the stamina be cut out before the apices open, the seed will either not ripen, or be barren if it ripens.
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  • Thus the anthers and stigmas in any given flower are often mature at different times; this condition, which is known as dichogamy and was first pointed out by Sprengel, may be so well marked that the stigma.
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  • The flower is termed proterandrous or proterogynous according as anthers or stigmas mature first.
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  • The former, which is a somewhat less favourable method than the latter, is effected by air-currents, insect agency, the actual contact between stigmas and anthers in neighbouring flowers, where, as in the family Compositae, flowers are closely crowded, or by the fall of the pollen from a (From Darwin's by permission.) FIG.
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  • A male flower has floated alongside a female and one of its anthers, which have opened to set free the pollen, is in contact with a stigma.
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  • In small flowers which are crowded at the same level or in flat flowers in which the stigmas and anthers project but little, slugs or snails creeping over their surface may transfer to the stigma the pollen which clings to the slimy foot.
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  • Dematophora necatrix on roots, Calyptospora Goeppertiana on stems, Ustilago Scabiosae in anthers, Claviceps purpurea in ovaries, &c. Associated with these relations are the specializations which parasites show in regard to the age of the host.
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  • The stamens are short, numerous and inserted at the base of the corolla; the anthers are large and yellow, and the long style ends in three branches.
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  • They are hypogynous, and have long and very delicate filaments, and large, linear or oblong two-celled anthers, dorsifixed and ultimately very versatile, deeply indented at each end, and commonly exserted and pendulous.
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  • The filaments elongate rapidly at flowering-time, and the lightly versatile anthers empty an abundance of finely granular smooth pollen through a longitudinal slit.
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