| Sphenophyta |
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| • | Stele:
Siphonostele |
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| • | Undulipodia
(“flagella”): Several whiplash |
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| • | Sexual
reproduction: Homosporous |
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| • | Representative
genera: Equisetum |
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| • | Recognized
by: Scale leaves in whorls; |
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| hollow
stems; meiosporangia on |
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| sporangiophores |
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