Sagittaria brevirostra Mack. & Bush
Family: Alismataceae
midwestern arrow-head, short-beaked arrow-head
[Sagittaria engelmanniana subsp. brevirostra J.G.Sm.]
Sagittaria brevirostra image
from USDA Plants website  
Sagittaria brevirostra image
Paul L. Redfearn, Jr.  
Etymology: Sagittaria: from Latin sagitta, "arrow," because of the leaf shape
Plants: erect or floating, perennial, emergent aquatic
Leaves: arrow-shaped, long stalks corrugated in cross-section
Flowers: white, 3-parted, 1/2"-1 1/3" wide; inflorescence of 5-12 whorls of flowers with long bracts, stalk usually 1-angled and unbranched; most upper flowers male, lower female; blooms July-Oct.
Fruits: dry, flattened and winged seed with an erect beakseed drawing
Habitat: shallow water, swamps, ponds
Conservation Status: Native
Emergent aquatic herb of shorelines and near shore zones of streams, backwaters and marshes. Found in areas that are or were formerly prairie biome.
Rare statewide but locally frequent in the southwestern part of the state. There is a general tendency for the lateral (basal) lobes of the leaf to be equal to or longer than the central portion of the blade (vs. shorter than or subequal to in S. latifolia and S. cuneata), but this characteristic alone should never be relied upon for identification. Instead, look for flat, persistent, 15--30 (70) mm long, lanceolate, attenuate bracts at the base of each inflorescence whorl. Achene resin gland absent.
Sagittaria brevirostra image
Paul L. Redfearn, Jr.