Northern Prairie Wildlife Research Center
Green Flatsedge (Cyperus pseudovegetus)
- Family: Sedge (Cyperaceae)
- Flowering: June-October.
- Field Marks: This flatsedge can be distinguished by its short, ovate, green spikelets with curved scales and the presence of only 1 stamen in each flower.
- Habitat: Marshes, roadside ditches, wet prairies, swamps, around ponds and lakes.
- Habit: Perennial herb with thickened rootstocks.
- Stems: Erect, smooth, obscurely triangular, up to 2 1/2 feet tall.
- Leaves: Long, narrow, smooth along the edges, up to 1/4 inch broad.
- Flowers: One per scale, with many scales per spikelet, each spikelet 1/8-1/4 inch long, ovate, green, the entire cluster of spikelets subtended by 4-6 leaflike bracts.
- Scales: Elongated, folded, curved, pale green, pointed at the tip, 1/10 inch long.
- Sepals: 0.
- Petals: 0.
- Stamens: 1.
- Pistils: 1; styles 3; ovary superior.
- Fruits: Achenes linear, curved, 1/20 inch long.
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