GYMNOSPERMS

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  1. lignophytes
    woody plants
  2. woody plant derived features
    • vascular cambium
    • cork cambium
  3. vascular cambium
    gives rise to secondary xylem (wood) and phloem
  4. cork cambium
    gives rise to periderm (including cork)
  5. spermatophytes
    • seed plants
    • monophyletic group within the lignophytes
    • eustele
  6. seed
    • embryo surrounded by nutritive tissue and a seed coat
    • provides protection adn nutrients to developing embryos during their formation and germination
  7. seed evolution
    • heterospory (two types of spores)
    • endospory
    • reduction of megaspore numner to one
    • retention of megaspore within megasporangium instead of released
    • evolution of integument
  8. endospory
    development of gametophyte within a spore wall
  9. integument
    outer layer of ovules
  10. pollen grain
    immature, endosporic male gametophyte
  11. male gametophyte not considered mature until
    pollen tube has formed
  12. siphonogamy
    process of the formation of the pollen tube
  13. seed adaptation
    • providing protection to the embryo
    • acting as dispersal units
    • dormancy
    • nutritive tissue to the embryo
  14. progymnosperms
    • extinct
    • reproduced by freely dispersed spores, yet had wood similar to that of living conifers
    • secondary phloem
    • Archeopteris
  15. Archeopteris
    progymnosperm
  16. Pteridosperms
    • seed ferns
    • primitive seed-bearing plants with fernlike leaves
  17. gymnosperms
    • naked seed
    • ovules are exposed to air (seeds not in fruit)
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    • A OVULIFEROUS SCALE
    • B MEGASPOROCYTE
    • C INTEGUMENT
    • D MICROPYLE
    • E STERILE BRACT
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    ABIES
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    CHAMAECYPARIS
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    CRYPTOMERIA
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    CUNNINGHAMIA
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    CUPRESSUS
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    cycas
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    EPHEDRA
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    EPHEDRA
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    FEMALE GINKGO
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    GNETUM
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    GNETUM
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    JUNIPERUS
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    LARIX
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    LARIX
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    LARIX
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    microsporangiate strobilus
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    microsporangiate strobilus
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    Ovules in pairs on stalks at tips of spur shoots
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    PICEA
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    PODOCARPUS
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    SEQUOIA
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    TAXODIUM
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    TAXUS
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    THUJA
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    TSUGA
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    WELWITSCHIA
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    WELWITSCHIA
Author:
rice2am
ID:
264673
Card Set:
GYMNOSPERMS
Updated:
2014-03-02 20:05:58
Tags:
GYMNOSPERMS
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GYMNOSPERMS
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