Cyperus odoratus
Rusty nut sedge, Rusty flatsedge Taxonomy
Synonyms: Cyperus engelmanii, Cyperus ferruginescens, Cyperus engelmannii Subspecific taxa: Classification:
Other taxonomic & nomenclature sources: USDA Plants;  ITIS;  The Plant List;  IPNI Images
   
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Species Distribution
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County Map Legend
Absent: Not known from county Medium confidence: Medium or unknown confidence; often old records or unverifiable observations Medium-high confidence: Often observations by expert botanists High confidence: Often vouchered herbarium records Planted / introduced: Native species introduced outside historic range, or only in planted locations within county (e.g., restorations) Historic / extirpated: Only historic records for the species; likely extirpated (Note that this category is not yet functional) North American distribution maps for this species: FLNA;  USDA Plants;  BONAP;  BISON
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Species Status
Status/Listing: No Information Notes:There are many synonyms and described varieties for this worldwide species. Origin: Native
Species Description
General: Monocot, annual Roots: adventitious, fibrous Shoots: alternate leaf arrangment; simple leaf type; entire leaf margin; Parallel leaf venation; awl-shaped leaf shape Inflorescence: spike, head Flowers: perfect; 3 merous; incomplete, not petals, not sepals; hypogynous ovary position Fruit: achene Physiology: autotrophic Reproduction: sexual
Ecology & Natural History
Habitat: Species is distributed on wet ground. Species is distributed on muddy margins of mudflats, banks, alluvium of the larger streams and rivers, margins of sloughs, oxbows, occasionally along railroads often with C. erythrorhizos. Also in areas of high salt content, such as interstates and tollways. ILPIN Notes: This is a coarse annual. Spikelets are characteristic. They have up to 18 dististichous flowers that barely overlap, and so have a strongly zig-zag outline to their overall linear form. Species is widely scattered in Illinois. Type locality along Cahokia Creek, St. Clair county; Rukenthal claims this is part of C. ferax (ref. 8); Specific epithet is also spelled engelmannii (ref. 7). Species is scattered throughout Illinois. Habitat is subject to frequent inundation, which produces peculiar shortened plants with long spikelets, the spikelets with long, loosely spreading scales. This is coarse in aspect. Its sublate scales distinguish this from Cyperus esculentus. Functional Relationships:
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