Northern Prairie Wildlife Research Center
Southern Wetland Flora
Field Office Guide to Plant Species
Knotroot Bristle Grass
Setaria geniculata (Lam.) Beauv.
- Family: Grass (Poaceae)
- Flowering: May-October
- Field Marks: This Setaria differs from all others in the genus by its smooth sheaths and presence of rhizomes.
- Habitat: Pinelands, roadsides, shifting coastal sands, brackish or fresh shores, flatwoods, sand hills,
- Habit: Tufted perennial grass with slender rhizomes.
- Stems: Upright, green to
purplish, unbranched, smooth, up to 2 1/2 feet long.
- Leaves: Elongated, ascending, up to 1/3 inch
wide; sheaths smooth along the margins.
- Flowers: Borne in spikelets, the spikelets crowded into a
dense, cylindrical, spike-like panicle; spikelets up to 1/10 inch long, subtended by 4-8 bristles.
- Sepals: 0.
- Petals: 0.
- Stamens: 3.
- Pistils: Ovary superior.
- Grains: Ellipsoid, enclosed by the persisting scales.
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