Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Sagittaria latifolia Willd.
- Family: Water Plantain (Alismataceae)
- Flowering: June-September
- Field Marks: The leaves are usually very broad and arrowhead-shaped. This one differs from other broad-leaved species of arrowhead by its achene with a horizontal beak and the boat-shaped bracts that are either pointed or round-tipped, but not t
- Habitat: Wet ditches, edges of lakes and ponds, often in shallow water.
- Habit: Perennial herb with rhizomes.
- Stems: The only stems are the rhizomes that are below the surface of the ground in
- Leaves: Variable, but most of them arrowhead-shaped, up to 18 inches long, the basal
triangular lobes either longer or shorter than the terminal lobe, smooth; leaf stalks angular,
- Flowers: Male and female flowers usually borne separately but on the same plant, the
uppermost flowers usually male, the lowermost flowers usually female, each flower subtended
by boat-shaped, pointed or round-tipped bracts up to 3/4 inch long.
- Sepals: 3, free from each other, green, up to 1/2 inch long, eventually pointing downward.
- Petals: 3, free from each other, white, up to 1 inch long.
- Stamens: Numerous.
- Pistils: Ovaries superior, numerous, very crowded.
- Fruits: Many achenes crowded into a rounded head, the head up to 1 1/2 inches long, the achenes obovoid, up to 1/5 inch long, winged, with a horizontal beak.
- Notes: The achenes are eaten by waterfowl.
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