Illinois Natural History Survey - University of Illinois

Eleocharis geniculata
Spike rush, Knee spike rush
Taxonomy

Synonyms: Eleocharis caribaea

Subspecific taxa:

Classification:

Other taxonomic & nomenclature sources: USDA PlantsITISThe Plant ListIPNI

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: FLNAUSDA PlantsBONAPBISON

Collection & Observation Phenology [?]

J
0
F
0
M
0
A
0
M
0
J
0
J
0
A
0
S
0
O
0
N
0
D
0

Collection & Observation Timeline [?]

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: head

Flowers: perfect; 3 merous; complete, regular; hypogynous ovary position

Fruit: achene

Physiology: autotrophic

Ecology & Natural History

Habitat: Species is distributed in wet sand in calcareous marsh borders.

ILPIN Notes: This speices is similar to Eleocharis olivacea in vegetative size and achene color. Species has orbicular to ovate-obtuse spikelets, rough and usually persistent bristles, and the tubercle of the achene is flush with the top of the round achene body. There is one collection in Illinois in Cook county.

Functional Relationships:

Human Relationships:

  • Edibility [?] :
  • Showy Flowers:

Wildlife and Livestock Information:

  • Food Value:
  • Cover Value:

Coefficient of Conservatism (C-value) [?] :

  • Entire State: 10
  • Chicago Area: 10

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