SafePlants

Carex filifolia - Threadleaf Sedge

Carex filifolia, commonly known as threadleaf sedge, is a species of sedge belonging to the Cyperaceae family.

Considerations for Pets

• The leaves are described as filiform or acicular (needle-shaped), potentially posing a risk of irritation if ingested or handled roughly.

Taxonomy and Nomenclature

• Scientific Name: Carex filifolia Nutt.
• Common Name: Threadleaf Sedge
• Family: Cyperaceae (Sedge family)
• Synonyms:
  • Itheta breviseta (Torr.) Raf.
  • Kobresia globularis Dewey
  • Olotrema filifolia (Nutt.) Raf.
  • Uncinia

Distribution and Habitat

• Native to the grasslands of the northern Great Plains of North America.
• Also found in subalpine meadow communities (e.g., Idaho Fescue/Threadleaf Sedge Cushion Plant Community).

Ecological Role

• Considered one of the most important dryland plants in its native grassland habitat.
• Contributes significantly to herbage production in certain areas.
• Its relationship to fire has been studied, indicating its importance in fire ecology.

Morphological Characteristics

• The leaves are filiform (thread-like) or acicular (needle-shaped).

Interactions with Other Organisms

• Serves as a food source, its crude protein content varying throughout the year.
• It is part of the diet of grasshoppers.

Quirky Facts

• Seed production is notably low, which may influence propagation strategies.
• The crude protein content can vary dramatically, ranging from over 18% in late April to 5% or less at other times.

Further Information

• USDA-NRCS PLANTS Database
• FEIS species review
• Discover Life