Northern Prairie Wildlife Research Center
Northeast Wetland Flora
Field Office Guide to Plant Species
Juncus marginatus Rostk.
- Family: Rush (Juncaceae)
- Flowering: June-September
- Field Marks: The distinguishing features of this rush are the flat leaves, the knotty rhizomes,
and the clump-forming habit.
- Habitat: Marshes, wet meadows, shorelines.
- Habit: Perennial herb from knotty rhizomes, forming clumps.
- Stems: Upright, slender, smooth, up to 2 1/2 feet long.
- Leaves: Elongated, flat, soft, up to 1/6 inch wide, smooth.
- Flowers: 2-12 crowded into nearly spherical heads, the heads borne in a cyme up to 4 inches long.
- Sepals: 3, narrowly lanceolate, pointed at the tip, reddish brown, slightly keeled, up to 2/5 inch long, slightly shorter than the petals.
- Petals: 3, narrowly lanceolate, pointed at the tip, reddish brown, slightly keeled, up to 1/2 inch long, slightly longer than the sepals.
- Stamens: 3.
- Pistils: Ovary superior, smooth.
- Fruits: Capsules obovoid, rounded at the tip, about 2/5 inch long; seeds pointed at both ends.
- Notes: The seeds are eaten by waterfowl.
Previous Species -- Canada Rush (Juncus canadensis)
Return to Species List -- Group 4
Next Species -- Big-head Rush (Juncus megacephalus)