Aristida oligantha
Wire grass, Old field three awn, Plains three awn grass Taxonomy
Synonyms: 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: 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: panicle Flowers: perfect; 3 merous; complete; hypogynous ovary position Fruit: grain Physiology: autotrophic; C4 C02 fixation Reproduction: sexual
Ecology & Natural History
Habitat: Species is distributed along railroads, eroded slopes, clayey roadsides. Hard, white clay soil is a frequent habitat for all species in genus, overgrazed areas, and places with little competition. ILPIN Notes: Stephens, H.A. 1980. Poisonous Plants of the Central United States. Regent Press of Kansas. Lawrence, KA. 165 pp. Baskin, J. M., and C. C. Baskin. 1981. Photosynthetic pathways indicated by leaf anatomy in fourteen summer annuals of cedar glades. Photosynthetica 15: 205-209. Species is tufted. Lemma awns are free at base, to 35-70 mm. long, longest awns of the Section Chaetaria. When mature plants are whitish, tough and wiry. Regarding weediness, species may be economic or colonizing. Species is found throughout the state. This is the most common Aristida in Illinois. Functional Relationships:
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