Key characteristics: Fronds and flowers emerge from two lateral pouches, crystal cells with raphides or druses present, seeds longitudinally ribbed, flowers with 2 4-locular stamens, flowers surrounded by a spathe-like membrane, Large specimens have at least 7 fronts of witch some (1-5) but never all perforate the prophyllum, more than 5 nerves, length/width of fronds is 1.0–1.5
Spirodela intermedia
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