Eleocharis equisetoides
Knotted spikerush, Horsetail spike rush Taxonomy
Synonyms: Subspecific taxa: Classification:
Other taxonomic & nomenclature sources: USDA Plants;  ITIS;  The Plant List;  IPNI 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: Extinct Notes:Ebinger et al. 2010, say the following about this species in IL: "This species of open wetlands is native to much of the eastern United States (Gonza´ lez-Elizondo 2002). Jones and Fuller (1955) and later Mohlenbrock (2001a, 2002a) reported this species from Cook County [1890]. There are two specimens on the herbarium sheet, the basal part of a sterile E. quadrangulata, and the top parts of six culms of E. quisetoides (Boufford 2009). Bowles et al. (1991) considers this species as extirpated, while Gonza´ lez-Elizondo (2002) did not list this species for Illinois in the ‘‘Flora of North America.’’ Origin: Native
Species Description
General: Monocot, perennial Roots: adventitious, fibrous Shoots: alternate leaf arrangment; simple leaf type; entire leaf margin; Parallel leaf venation; hastate leaf shape Inflorescence: spike, head Flowers: perfect; complete, regular; hypogynous ovary position Fruit: achene Physiology: autotrophic; C3 C02 fixation Reproduction: sexual
Ecology & Natural History
Habitat: ILPIN Notes: Culms round, septate by cross-partitions, lowest sheaths frequently bearing a leaf; scales rather elliptic; bristles few. Leaves reduced to bladeless sheaths Functional Relationships:
Human Relationships:
Wildlife and Livestock Information:
Coefficient of Conservatism (C-value) [?] :
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