Northern Prairie Wildlife Research Center
Three-way Sedge (Dulichium arundinaceum)
- Family: Sedge (Cyperaceae)
- Flowering: July-September.
- Field Marks: This is one of the easiest sedges to recognize, even if not flowering, because of the perfect three ranks in which the leaves are arranged. (Look straight down on the plant to observe this.) The stems are hollow.
- Habitat: Swamps, bogs, sink-hole ponds.
- Habit: Perennial herb with extensive rhizomes.
- Stems: Erect, jointed, smooth, round or only obscurely triangular, hollow, up to 3 feet tall.
- Leaves: Alternate, simple, linear, perfectly 3-ranked, pointed at the tip, smooth or slightly rough along the edge, up to 3 inches long, about 1/4 inch broad.
- Flowers: One per scale, with many scales per spikelet, each spikelet pointed at the tip, up to 1 inch long.
- Scales: Brownish green, pointed, up to 1/3 inch long.
- Sepals: 0.
- Petals: 0.
- Stamens: 3.
- Pistils: 1; styles 2; ovary superior.
- Fruits: Achenes are eaten by waterfowl.
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