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venation

venation

venation Sentence Examples

  • A leaf with only a single midrib is said to be unicostate and the venation is described as pinnate or feather-veined.

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  • The leaf in this case is multicostate and the venation palmate.

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  • The venation is radiating.

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  • To a distribution of veins such as this the name of reticulated or netted venation has been applied.

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  • The leaves of Monocotyledons have generally this kind of venation, while reticulated venation most usually occurs amongst Dicotyledons.

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  • The arrangement of the fibro-vascular system in the lamina constitutes the venation or nervation.

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  • The first book with his imprint is The Psalms of David Imitated in For the prevention of counterfeiting continental paper money Franklin long afterwards suggested the use on the different denominations of different leaves, having noted the infinite variety of leaf venation.

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  • 3.1 Palisade Tissue and Spongy Cells 3.2 Cell Formations 3.3 Blade/Lamina and Stalk/Petiole 3.4 Venation

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  • The fibro-vascular system in the leaf constitutes the venation.

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  • Some plants, which in most points of their structure are monocotyledonous, yet have reticulated venation; as in Smilax and Dioscorea.

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  • taking place in a simple leaf with palmate or radiating venation, give origin to lobed, cleft and partite forms.

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  • 4) is the general term applied to leaves with radiating venation, in which there are several lobes united by a broad expansioi.

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  • of parenchyma, like the palm of the hand, as in the sycamore, castoroil plant, &c. The divisions of leaves with radiating venation may extend to near the base of the leaf, and the names bipartite, tripartite, quinquepartite, &c., are given according as the partitions are two, three, five or more.

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  • The term dissected is applied to leaves with radiating venation, having numerous narrow divisions, as in Geranium dissectum.

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  • When the vascular bundles reach the base of the lamina they separate and spread out in various ways, as already described under venation.

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  • In Anomochloa there are several nearly equal ribs and in some broad-leaved grasses (Bambuseae, Pharus, Leptaspis) the venation becomes tesselated by transverse connecting veins.

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  • The venation is like that of many ferns, e.g.

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  • The leaves, which are borne in pairs at the tumid nodes, are oval in form and have a Dicotyledonous type of venation.

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  • The venation is useful as pointing out the number of leaves which constitute a gamosepalous calyx.

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  • (After Duchartre.) the calyx being trifid (three-cleft), quinquefid (five-cleft), &c., according to their number; or they reach to near the base in the form of partitions, the calyx being tripartite, quadripartite, quinquepartite, &c. The union of the parts may be complete, and the calyx may be quite entire or truncate, as in some Correas, the venation being the chief indication of the different parts.

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  • The number of parts forming such a corolla can be determined by the divisions, whether existing as teeth, crenations, fissures or partitions, or if, as rarely happens, the corolla is entire, by the venation.

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  • When the union is incomplete, the number of the parts of a compound pistil may be determined by the number of styles and stigmas; when complete, the external venation, the grooves on the surface, and the internal divisions of the ovary indicate the number.

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  • In such carbonaceous impression not only are the form and markings, such as venation, perfectly preserved, but something of the actual structure may remain.

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  • Hence palaeobotanists have found it necessary to adopt a purely :artificial system of classification, based on form and venation of the frond, in the absence of adequate data for a more natural, grouping.

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  • It is, however, probable that a considerable group of true Ferns, allied to Marattiaceae, existed in Palaeozoic times, side by side with simpler forms. In one respect the fronds of many Palaeozoic Ferns and Pteridosperms were peculiar, namely, in the presence on their rachis, and at the base of their pinnae, of anomalous leaflets, often totally different in form and venation from the ordinary pinnules.

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  • This genus, from the Permo-Carboniferous of Autun, is represented by large, fleshy, reniform leaves or leaflets, with radiating dichotomous venation; the vascular bundles have in all respects the structure of those in the leaves of Cycads or Cordaiteae.

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  • - Glossopteris frond, with portion enlarged to show the venation.

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  • Alternating bars of light cast a pale glow through the venation blinds on her near-white body.

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  • forewing venation as in fig.

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  • If you compare the venation with a dragonfly for example, the latter have much more complex venation and smaller ' cells ' .

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  • The first book with his imprint is The Psalms of David Imitated in For the prevention of counterfeiting continental paper money Franklin long afterwards suggested the use on the different denominations of different leaves, having noted the infinite variety of leaf venation.

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  • 3.1 Palisade Tissue and Spongy Cells 3.2 Cell Formations 3.3 Blade/Lamina and Stalk/Petiole 3.4 Venation

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  • The fibro-vascular system in the leaf constitutes the venation.

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    0
  • The arrangement of the fibro-vascular system in the lamina constitutes the venation or nervation.

    0
    0
  • A leaf with only a single midrib is said to be unicostate and the venation is described as pinnate or feather-veined.

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    0
  • The leaf in this case is multicostate and the venation palmate.

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  • To a distribution of veins such as this the name of reticulated or netted venation has been applied.

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  • (Reticulated venation; primary veins going to the margin, which is serrated.

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  • The leaves of Monocotyledons have generally this kind of venation, while reticulated venation most usually occurs amongst Dicotyledons.

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  • Some plants, which in most points of their structure are monocotyledonous, yet have reticulated venation; as in Smilax and Dioscorea.

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  • taking place in a simple leaf with palmate or radiating venation, give origin to lobed, cleft and partite forms.

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    0
  • 4) is the general term applied to leaves with radiating venation, in which there are several lobes united by a broad expansioi.

    0
    0
  • of parenchyma, like the palm of the hand, as in the sycamore, castoroil plant, &c. The divisions of leaves with radiating venation may extend to near the base of the leaf, and the names bipartite, tripartite, quinquepartite, &c., are given according as the partitions are two, three, five or more.

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  • The term dissected is applied to leaves with radiating venation, having numerous narrow divisions, as in Geranium dissectum.

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  • The venation is radiating.

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  • When the vascular bundles reach the base of the lamina they separate and spread out in various ways, as already described under venation.

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  • - Leaf of an Acacia (Acacia heterophylla), showing a flattened leaf-like petiole p, called a phyllode, with straight venation, and a bipinnate lamina.

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  • The venation is strictly parallel, the midrib usually strong, and the other ribs more slender.

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  • In Anomochloa there are several nearly equal ribs and in some broad-leaved grasses (Bambuseae, Pharus, Leptaspis) the venation becomes tesselated by transverse connecting veins.

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  • (a) Stangerieae.- Characterized by the fern-like venation of the pinnae, which have a prominent midrib, giving off at a wide angle simple or forked and occasionally anastomosing lateral veins.

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  • The venation is like that of many ferns, e.g.

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  • The leaves, which are borne in pairs at the tumid nodes, are oval in form and have a Dicotyledonous type of venation.

    0
    0
  • The venation is useful as pointing out the number of leaves which constitute a gamosepalous calyx.

    0
    0
  • (After Duchartre.) the calyx being trifid (three-cleft), quinquefid (five-cleft), &c., according to their number; or they reach to near the base in the form of partitions, the calyx being tripartite, quadripartite, quinquepartite, &c. The union of the parts may be complete, and the calyx may be quite entire or truncate, as in some Correas, the venation being the chief indication of the different parts.

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  • The number of parts forming such a corolla can be determined by the divisions, whether existing as teeth, crenations, fissures or partitions, or if, as rarely happens, the corolla is entire, by the venation.

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  • When the union is incomplete, the number of the parts of a compound pistil may be determined by the number of styles and stigmas; when complete, the external venation, the grooves on the surface, and the internal divisions of the ovary indicate the number.

    0
    0
  • In such carbonaceous impression not only are the form and markings, such as venation, perfectly preserved, but something of the actual structure may remain.

    0
    0
  • Hence palaeobotanists have found it necessary to adopt a purely :artificial system of classification, based on form and venation of the frond, in the absence of adequate data for a more natural, grouping.

    0
    0
  • It is, however, probable that a considerable group of true Ferns, allied to Marattiaceae, existed in Palaeozoic times, side by side with simpler forms. In one respect the fronds of many Palaeozoic Ferns and Pteridosperms were peculiar, namely, in the presence on their rachis, and at the base of their pinnae, of anomalous leaflets, often totally different in form and venation from the ordinary pinnules.

    0
    0
  • This genus, from the Permo-Carboniferous of Autun, is represented by large, fleshy, reniform leaves or leaflets, with radiating dichotomous venation; the vascular bundles have in all respects the structure of those in the leaves of Cycads or Cordaiteae.

    0
    0
  • - Glossopteris frond, with portion enlarged to show the venation.

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    0
  • If you compare the venation with a dragonfly for example, the latter have much more complex venation and smaller ' cells '.

    0
    0
  • (Reticulated venation; primary veins going to the margin, which is serrated.

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  • - Leaf of an Acacia (Acacia heterophylla), showing a flattened leaf-like petiole p, called a phyllode, with straight venation, and a bipinnate lamina.

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  • The venation is strictly parallel, the midrib usually strong, and the other ribs more slender.

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    2
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