Illinois Natural History Survey - University of Illinois

Cyperus lupulinus
Fern flatsedge
Taxonomy

Synonyms: Cyperus lupulinus var. macilentus, Cyperus lupulinus var. lupulinus, Cyperus filiculmis, Cyperus filiculmis var. macilentus, Cyperus filiculmis macilentus, Cyperus lupulinus ssp. lupulinus, Cyperus filiculmis var macilentus

Subspecific taxa:

Classification:

  • Magnoliophyta

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
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D
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Collection & Observation Timeline [?]

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: spike, head

Flowers: perfect; 3 merous; incomplete, not petals, not sepals; hypogynous ovary position

Fruit: achene

Physiology: autotrophic; C4 C02 fixation

Ecology & Natural History

Habitat: Species is distributed on rocky or sandy soil, open sandy or rocky woods, open ridges, glades, chert, or granite, and along railroads; in northern Illinois, it is found in sandy blackoak woods, sandy cemeteries. Species is distributed in sandy soil, in southern Illinois on Shawnee Hills, open sandy or rocky woods, open ridges, glades of chert or granite and along railroads. In northern Illinois in sandy black oak woods and sandy cemeteries.

ILPIN Notes: Species is common in northern 1/2 of state, south to Madison county. There are two varieties in Illinois. I assume this is var. filiculmis, the typical one. Also, overlap of this with C. schweinitzii. Versus Cyperus filiculmis var. macilentus, this variety has several rays (3-6(8)), and it is overall somewhat larger. This variety has hard, corm-like rhizomes. Versus Cyperus filiculmis var. filiculmis, this variety is generally smaller.

Functional Relationships:

Human Relationships:

  • Edibility [?] : yes
  • Showy Flowers:

Wildlife and Livestock Information:

  • Food Value:
  • Cover Value:

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

  • Entire State: 5
  • Chicago Area: 5

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