Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Juncus biglumis L.
- Family: Rush (Juncaceae)
- Flowering: July-September
- Field Marks: This dwarf perennial has solitary heads on leafless stems. The heads consist of 2 flowers subtended by a single bract. The capsule which is sunken at the tip is longer than the sepals and petals.
- Habitat: Wet gravels, sphagnum beds, around lakes and ponds, sometimes in shallow
- Habit: Perennial herb with a short rhizome.
- Stems: Upright, unbranched, bearing only a single head, smooth, up to 1 foot tall, usually much shorter.
- Leaves: All basal or nearly so, inrolled into a very slender, hollow tube.
- Flowers: 2-4 borne in a solitary head at the tip of the stem, the inflorescence subtended by a single bract that usually surpasses the head.
- Sepals: 3, free from each other, purple-brown, 1/6-1/4 inch long, pointed or rounded at the tip.
- Petals: 3, free from each other, purple-brown, 1/6-1/4 inch long, pointed or rounded at the tip.
- Stamens: 6.
- Pistils: Ovary superior, smooth.
- Fruits: Capsules obovoid, sunken at the tip, up to 1/4 inch long, longer than the sepals and petals; seeds with a short appendage at either end.
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