Lemna minor is an annual, monocotyledon, free floating, tiny, green disk-shaped plants with a single, unbranched root from center of underside, body elliptic to egg-shaped, 0.2-0.6 cm wide, budding from edges, often 2-5 together with overlapping, fused edges, body flat or slightly convex on one or both sides, appearing rather thick (use lens), bright green to reddish, veins three, indistinct.
Flowers seldom produced, in pouches on the edge of the plant body, male flowers of 1-2 anthers, female flower solitary, naked, style one.
Fruit dry, inflated, 1-seeded.
Wetland status: OBL.
Frequency in NYC: Occasional.
Habitat: Still, shallow, high-nutrient water, pH 4.1-7.1 (Hotchkiss 1967; USDA, NRCS 2006), open or part shade.
Notes: Overwintering as winter buds (turions) at bottom of pond (Rook 2004). Plants eaten by many species of fish, ducks, also by coots (Martin et al. 1951). Plants contain very little fiber and are very high in nutrients, has been used as feed for domestic animals (Rook 2004).