familyCyperaceae
genusCyperus
subgenusCyperus subg. Pycnostachys
speciesCyperus distinctus

Cyperus distinctus

Steudel

Syn. Pl. Glumac. 2: 24. 1855.

Gordon C. Tucker*, Brian G. Marcks*, J. Richard Carter *
Illustrated
Synonyms: Cyperus virens var. brittonii C. B. Clarke
Treatment appears in FNA Volume 23. Treatment on page 154. Mentioned on page 143, 153, 155.
Please click on the illustration for a higher resolution version.
Illustrator: Yevonn Wilson-Ramsey

Copyright: Flora of North America Association

Herbs, perennial, cespitose, rhizomatous. Culms terete, 40–60 (–90) cm, glabrous. Leaves flat, 35–70 cm × 4–9 (–12) mm. Inflorescences: heads hemispheric, 10–20 mm diam.; rays 5–9 (–14), 3.5–10 cm; 2d order rays 0.5–2 cm; bracts 5–10, ± horizontal, flat, 12–40 (–50) cm × 2–7 mm. Spikelets (25–) 35–50 (–60), ovoid, compressed, (3.5–) 5–12 (–14) × 2.5–3.5 (–4) mm; floral scales 10–32, golden brown to brown, 2-keeled, laterally ribless, narrowly lanceolate, 2–2.2 (–3) × 0.8–1.4 mm. Flowers: stamen 1; anthers 1 mm; styles 1 mm; stigmas 0.5 mm. Achenes brown, stipitate, narrowly ellipsoid, 1.5–2 × 0.2–0.4 mm, base swollen, spongy, stipe 0.2 × 0.2–0.3 mm, apex acute, beak slender, 0.2 mm, surfaces puncticulate.


Phenology: Fruiting summer.
Habitat: Damp grasslands, roadsides, ditches
Elevation: 0–50 m

Distribution

V23 239-distribution-map.jpg

Fla., Ga., La., S.C., West Indies (Bahamas)

Discussion

The slender achenes with conspicuously swollen bases distinguish Cyperus distinctus from other species of subg. Pycnostachys.

Selected References

None.

Lower Taxa

None.

"shortened" is not a number.

... more about "Cyperus distinctus"
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Achene architecture
stipitate +
Achene coloration
brown +
Achene length
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Achene shape
ellipsoid +
Achene width
0.2mm;0.4mm +
Anther fixation
basifixed +
Anther some measurement
1 cm10 mm <br />0.01 m <br /> (?) +
Apex shape
acute +
Author
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Authority
Steudel +
Base duration
persistent +  and deciduous +
Base shape
swollen +
Base texture
spongy +
Beak size
slender +
Beak some measurement
0.2 cm2 mm <br />0.002 m <br /> (?) +
Blade presence
absent +
Blade prominence or shape
flat +
Blade shape
w--shaped +  and keeled +
Bract architecture
glumaceous +  and foliaceous +
Bract arrangement
2-ranked +  and arranged +
Bract atypical length
40 cm400 mm <br />0.4 m <br /> (50 cm500 mm <br />0.5 m <br />) +
Bract length
12 cm120 mm <br />0.12 m <br /> (40 cm400 mm <br />0.4 m <br />) +
Bract orientation
horizontal +
Bract prominence or shape
flat +
Bract quantity
5;10 +
Bract width
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Branch atypical quantity
3 (4) +
Branch quantity
2;3 +
Bristle atypical quantity
6;30 +
Bristle quantity
3;6 +
Cauline leaf architecture or shape
folded +
Cauline leaf arrangement
parallel +  and divergent +
Cauline leaf arrangement or course or shape
linear +
Cauline leaf orientation
Ascending (?) +
Cauline leaf prominence or shape
flat +
Cauline leaf shape
terete +, rolled +  and plicate +
Culm architecture or arrangement or growth form
not +  and solitary +
Culm atypical some measurement
60cm;90cm +
Culm pubescence
glabrous +
Culm relief
scabridulous +
Culm shape
terete +
Culm some measurement
40 cm400 mm <br />0.4 m <br /> (60 cm600 mm <br />0.6 m <br />) +
Distal scale architecture
empty +
Distribution
Fla. +, Ga. +, La. +, S.C. +  and West Indies (Bahamas) +
Elevation
0–50 m +
Embryo position
basal +
Endosperm quantity
abundant +
Floral scale architecture
ribless +
Floral scale arrangement
distichous +
Floral scale atypical length
0.22 cm2.2 mm <br />0.0022 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Floral scale coloration
golden brown +  and brown +
Floral scale duration
deciduous +
Floral scale length
0.2 cm2 mm <br />0.002 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
Floral scale quantity
10 (32) +
Floral scale shape
lanceolate +  and 2-keeled +
Floral scale width
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
Flower position
hypogynous +  and subtending +
Flower quantity
single +
Flower reproduction
bisexual +
Fruits achene shape
biconvex +  and trigonous +
Habitat
Damp grasslands, roadsides, ditches +
Head architecture
digitate +, glomerulate +  and umbellate +
Head arrangement
cluster +
Head diameter
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Head shape
hemispheric +
Illustration
Present +
Illustration copyright
Flora of North America Association +
Illustrator
Yevonn Wilson-Ramsey +
Inflorescence architecture
subumbellate +  and capitate +
Inflorescence position
pseudolateral +
Inflorescence position or structure subtype
terminal +
Inflorescences panicle architecture
pseudoumbel +
Inflorescences panicle development
modified +
Involucral-bract architecture or shape
leaflike +
Involucral-bract arrangement
arranged +
Involucral-bract orientation
spreading +  and erect +
Involucral-bract quantity
1;22 +
Leaf arrangement
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
Leaf atypical width
0.9 cm9 mm <br />0.009 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Leaf length
35 cm350 mm <br />0.35 m <br /> (?) +  and 70 cm700 mm <br />0.7 m <br /> (?) +
Leaf position
basal +
Leaf prominence or shape
flat +
Leaf width
0.4 cm4 mm <br />0.004 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
Ligule presence
absent +
Locule quantity
1 +
Margin fusion
fused +
Number of lower taxa
0 +
Perianth life cycle
falling +
Perianth presence
absent +
Perianth quantity
with (1-)3-6(-30) bristles and/or scales +
Pericarp width
thin +
Phenology
Fruiting summer. +
Pistil architecture
2-3(-4)-carpellate +
Pistil fusion
fused +
Pistil quantity
1 +
Prickle orientation
antrorse +  and extrorse +
Prophyll architecture
pistillate +
Prophyll atypical quantity
0 (3) +
Prophyll position
subtending +
Prophyll quantity
3 (?) +  and 1 (?) +
Publication title
Syn. Pl. Glumac. +
Publication year
1855 +
Rachillum architecture
wingless +
Rachillum duration
persistent +
Ray arrangement
singly +
Ray atypical quantity
9 (14) +
Ray length
unequal +
Ray quantity
5 +  and 9 +
Ray some measurement
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Reference
None +
Root derivation
adventitious +
Root texture
fibrous +
Scale architecture
empty +
Scale arrangement
distichous +
Scale atypical quantity
6 (30) +
Scale position
basal +  and proximal +
Scale quantity
0;76 +
Scale reproduction
fertile +
Scale shape
cylindric;compressed +
Seed quantity
1 +
Sheath shape
cylindric +
Source xml
https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V23/V23 239.xml +
Special status
Illustrated +
Spike quantity
single +
Spikelet architecture
spicate +
Spikelet architecture or arrangement or growth form
solitary +
Spikelet arrangement
arranged +
Spikelet atypical length
1.2 cm12 mm <br />0.012 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
Spikelet atypical quantity
50 (60) +
Spikelet atypical width
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Spikelet length
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Spikelet quantity
35 +  and 50 +
Spikelet shape
compressed;ovoid +
Spikelet width
2.5mm;3.5mm +
Stamen atypical quantity
1 (3) +
Stamen fusion
distinct +
Stamen quantity
1 +
Stem architecture
septate +, hollow +  and solid +
Stem shape
compressed +, terete +  and trigonous +
Stigma quantity
3 +
Stigma relief
papillate +
Stigma some measurement
0.5 cm5 mm <br />0.005 m <br /> (?) +
Stipe length
0.2 cm2 mm <br />0.002 m <br /> (?) +
Stipe width
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
Style architecture or shape
undivided +
Style arrangement or course or shape
linear +
Style shape
2-3-fid +
Style some measurement
1 cm10 mm <br />0.01 m <br /> (?) +
Surface coloration or relief
puncticulate +
Synonyms
Cyperus virens var. brittonii +
Taxon family
Cyperaceae +
Taxon name
Cyperus distinctus +
Taxon parent
Cyperus subg. Pycnostachys +
Taxon rank
species +
Testa fusion
free +
Testa width
thin +
Volume
Volume 23 +
Whole organism architecture
rhizomatous +
Whole organism duration
perennial +
Whole organism growth form
herb +  and cespitose +
Wing coloration
hyaline +
X chromosome quantity
5;100 +