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Spirodela polyrhiza   (L. ) Schleid.
Ottawa County, Kansas
Height: Plants aquatic, sometimes stranded on mud
Family: Araceae - Arum Family
Flowering Period:   July, August, September
Stems: Stems absent. Roots 7-21 per thallus, to 1.2 inch.
Leaves: Leaves not clearly differentiated. Thallus usually asymmetric, somewhat discoid, flat or slighlty convex on lower surface, obovate to nearly round, 1/8 to 2/5 inch long, 1/10 to 1/3 inch wide, veins 7-16(-21).
Inflorescences: Inflorescences highly reduced and consisting of 1-2 staminate and 1 pistillate flowers sometimes subtended by a tiny membranous sheath, rarely produced in nature in some species, plants reproducing mosty asexually through formation of plantlets in pouches along margins of tallus.
Flowers: Flowers seldom observed, unisexual, 1(-2) per thallus; sepals absent, petals absent; stamens 2; pistil 1.
Fruits: Utricles; seeds 1-3, longitudinally ribbed.
Habitat: Ponds and lakes, marshes, backwater areas along rivers and streams, springs and spring runs
Distribution: Occurs statewide
Origin: Native
Comments: Flowering rarely in Kansas, July to September elsewhere.
 Spirodela, cord and evident, alluding to the root, and polyrhiza, many and root.

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