Marsileaceae

Plants aquatic, rhizome submerged in the mud but some of the laminas may be floating. Sporocarps hard and woody, borne at the base of or along the stipes, 3–9 mm long Marsileaceae

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Sterile lamina with 2 pairs of opposite leaflets, resembling a 4-leafed clover Marsilea

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Sterile lamina linear, filiform or grass-like Pilularia