Northern Prairie Wildlife Research Center
Needle Spikerush (Eleocharis acicularis)
- Family: Sedge (Cyperaceae)
- Flowering: June-October.
- Field Marks: This species is readily distinguished from other spikerushes by its thread-like stems and tiny, sharply pointed spikelets.
- Habitat: Around ponds and lakes, edge of marshes.
- Habit: Perennial herb with slender stolons.
- Stems: Erect or usually matted, thread-like, smooth, up to 6 inches long.
- Leaves: 0.
- Flowers: Borne in single spikelets at the tip of each stem; the spikelets lanceoloid, sharply pointed at the tip, up to 1/4 inch long.
- Scales: Oblong, rounded or slightly pointed at the tip, up to 1/10 inch long.
- Sepals: 0.
- Petals: 0.
- Stamens: 3.
- Pistils: Style 3-cleft; ovary superior.
- Fruits: Achenes obovoid, yellowish, shiny, with a network pattern on the surface, up to 1/16 inch long, with a cone-shaped tubercle on the top.
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