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Plant Form: Non-woody herbs.
Size: 5 to 120 cm tall.
Stem: Green, hollow sterile stems, and pale brown fertile fronds, segmented and grooved.
Leaves: Inconspicuous small, growing in rings, joined at edges to form teeth around stem, casuarina like in appearance.
Fruit and Seeds: Fronds bear pale brown fruiting cones.
Habitat: Damp woodlands, pastures, riversides, bogs.