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plains flatsedge
Scientific Name: Cyperus onerosus
Family: Cyperaceae
Category: Monocot
Growth: Graminoid
Duration: Perennial
Other Names:
Cyperus lupulinus: Great Plains Flatsedge
Cyperus lupulinus, commonly known as the Great Plains flatsedge or slender flatsedge, is a plant species native to North America.
Taxonomy and Nomenclature
- Scientific Name: Cyperus lupulinus
- Synonym: Cyperus lupulinus (Spreng.) Marcks
- Family: Cyperaceae (Sedge Family)
- Genus: Cyperus
- Species: lupulinus
- Subspecies:
- Cyperus lupulinus subsp. lupulinus
- Cyperus lupulinus subsp. macilentus (Fernald) Marcks
- USDA Symbol: (Mentioned as a synonym, but the actual symbol is not provided)
- Alternative Scientific Names: Cyperus bushii (mentioned as a synonym for Cyperus lupulinus ssp. lupulinus)
Distribution and Habitat
- Native to North America, widespread across southeastern Canada and the central and northeastern United States.
- Occasionally found in the Pacific Northwest.
- Prefers open fields, roadsides, and disturbed areas on sandy, well-drained soil.
- Also found in wet areas.
- There are two subspecies in New England.
Morphological Characteristics
- Culms: Slender, wiry, 3-sided, and glabrous (smooth).
- Leaves: Blades folded together lengthwise or flat, 2 to 18 inches long, 1/25 to 1/7 inch wide, shorter than the culms.
- Displays a columnar development, growing upwards with little width.
Quirky Facts
- The scales of Cyperus lupulinus subsp. macilentus are more loosely arranged around the fruit than those of the closely related Cyperus lupulinus.
Further Information
- Information available from the Integrated Taxonomic Information System (ITIS), NatureServe, uBio.
- Photos are credited to Stephen M. Young, Pete Woods and Gerald D. Tang.