Spirodela polyrhiza (L.) Schleid.

PLANTS OF IOWA
Herbarium of Iowa State College
Spirodela polyrhiza (L.) Schleid,
Clay Co., Lake Twp., Sec. 25.
Large colonies floating on open waters
of Mud Lake. Abundant. In different
locations in the lake were L. minor
and Wolffia.
NEW YORK BOTANICAL GARDEN
03700725
July 14, 1937,
Collected by Ada Hayden
No. 10,135
03700725