Spirodela polyrhiza (L.) Schleid.
Source: ASU Image Library
Family: Araceae
Spirodela polyrhiza image
From Flora of Indiana (1940) by Charles C. Deam
Locally abundant throughout the state in lakes, ponds, swamps, ditches, and sluggish streams. These plants are preyed upon by insects.

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Indiana Coefficient of Conservatism: C = 5

Wetland Indicator Status: OBL

Thallus broadly oval to obovate, anthocyanic beneath, (3-)5-8(-10) mm, ┬▒evidently 5-15-nerved, forming turions especially in the fall; roots mostly 5-12; spathe open only at the top; seeds 1 or 2, smooth or minutely reticulate; 2n=30, 40, 50. Quiet water; nearly cosmopolitan, and throughout our range.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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