Illinois Natural History Survey - University of Illinois

Juncus biflorus
Rush, Two-flowered rush
Taxonomy

Synonyms: Juncus biflorus andinus

Subspecific taxa:

Classification:

Other taxonomic & nomenclature sources: USDA PlantsITISThe Plant ListIPNI

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: FLNAUSDA PlantsBONAPBISON

Collections, Observations & Flowering by Month [?]

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F
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M
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A
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M
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J
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J
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A
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S
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O
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N
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D
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Collections & Observations by Decade [?]

Species Status

Status/Listing: No Information

Notes:

Origin: Native

Species Description

General: Monocot, perennial

Roots: adventitious, rhizomes

Shoots: alternate leaf arrangment; simple leaf type; entire leaf margin; Parallel leaf venation; awl-shaped leaf shape

Inflorescence: other

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

Fruit: capsule

Physiology: autotrophic

Reproduction: sexual, vegetative

Ecology & Natural History

Habitat: Species is distributed in moist or wet meadows or shores. Also, it is found in prairie swales, sandy open ground, usually in acid soils, other wet habitats, moist sands. Species is distributed in wet meadows, prairie swales, and sandy open ground, usually in acid soils.

ILPIN Notes: Species is occasional to common in southern 1/2 of Illinois. J. biflorus, as opposed to Juncus marginatus, with which this species often occurs, is: more robust with thicker, more branched and more knotty underground stems; found in wetter places. This variety has glomerules approximate and inflorescence conjested. Species is scattered in southern 1/2 of state.

Functional Relationships:

  • Pollinators: wind
  • Dispersal:
  • Mycorrhizae:
  • N2 fixation:

Human Relationships:

  • Edibility [?] :
  • Showy Flowers:

Wildlife and Livestock Information:

  • Food Value:
  • Cover Value:

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

  • Entire State: 5
  • Chicago Area: 10

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