|arrowhead (Sagittaria spp.)||
arrowhead (Sagittaria spp.; WATER-PLANTAIN FAMILY [Alismataceae]) Perennial aquatic herbs with white flowers ½-1" wide, usually growing in whorls of 3 from an unbranched stalk. Most species with both arrow-shaped emergent leaves, and flat-petioled, bladeless, underwater leaves. Grows as emergent from shallow water or in marshes. Summer flowering. 
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