Lemna aequinoctialis (Araceae)
Fronds 1-6.5 mm long, 0.8-4.5 mm wide, 1-3 times as long as wide; usually with one papule which is located on the upper surface above the node and is smaller than the one near the tip; wing of the root sheath 1-2 1/2 times as long as wide. INFLORESCENCE: Plants often flowering and fruiting. INFRUCTESCENCE: Fruit 0.5-0.8 mm long, 0.4-0.7 mm wide, not winged; style 0.05-0.20 mm long; seed 0.45-0.80 mm long, 0.3-0.7 mm thick, brownish, with 8-26 distinct longitudinal and 30-80 lateral ribs, falls out of the fruit wall after ripening; outer seed coat with 2-4 subepidermal cell layers.
Seeds with 8-26 distinct ribs, fall out of fruit wall after ripening; wing of the root sheath 1-2.5 times as long as wide; mostly one papaule above the node which is smaller than the one near tthe tip. Found in warmer regions of the whole world.
Distribution Subtropical and tropical regions of the whole world; introduced to more northern regions by rice cultures.