California arrowhead, Sagittaria montevidensis ssp. calycina Gregg's arrowhead, Sagittaria longiloba
Seedling leaves are narrow with nearly parallel sides tapering to a blunt point rectangular-shaped markings on leaves distinguish them from seedlings of ducksalad, bulrush, and monocoria grows submerged roots are septate (divided by horizontal partitions) in contrast to ducksalad roots third or fourth true leaf is arrowhead shaped Mature plant leaves and flower-bearing stems grow above the water surface flowers, borne in clusters, have three white petals Gregg's (perennial) arrowhead leaves are much narrower than California arrowhead, with basal lobes 2 to 3 times longer than terminal lobe Gregg's arrowhead reproduces by seed, rhizomes, and corms Management
California arrowhead Maintain water level at 4 inch depth Herbicides Note: Do not use Londax on resistant biotypes	Gregg's arrowhead Maintain a good rice stand Dry fallow one year if severe infestation Herbicides give erratic control

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Modified: 11 Sep 1997 Comments to jayoung@ucdavis.edu