Northern Prairie Wildlife Research Center
Twinflower Rush (Juncus biflorus)
- Family: Rush (Juncaceae)
- Flowering: May-September.
- Field Marks: This rush differs from others by its red-brown flowers and capsules arranged 2-12 in a group.
- Habitat: Wet meadows, wet prairies, roadside ditches.
- Habit: Tufted perennial herb with short rhizomes.
- Stems: Erect, smooth, up to 3 1/2 feet tall.
- Leaves: Long, narrow, flat, smooth, up to 1/4 inch broad.
- Flowers: 2-12 in small clusters, with many clusters in an open, branched inflorescence.
- Sepals: 3, narrow, pointed, about 1/10 inch long.
- Petals: 3, narrow, pointed, slightly longer than the sepals.
- Stamens: 3.
- Pistils: Ovary superior.
- Fruits: Capsules obovoid, red-brown, smooth, shiny, about 1/10 inch long.
- Notes: The fruits are eaten by waterfowl.
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