Cyperus distinctus

Steudel

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

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.

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.
... more about "Cyperus distinctus"
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
ellipsoid +
0.2mm;0.4mm +
1 cm10 mm <br />0.01 m <br /> (?) +
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Steudel +
shortened +
persistent +  and deciduous +
swollen +
slender +
0.2 cm2 mm <br />0.002 m <br /> (?) +
w--shaped +  and keeled +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
40 cm400 mm <br />0.4 m <br /> (50 cm500 mm <br />0.5 m <br />) +
12 cm120 mm <br />0.12 m <br /> (40 cm400 mm <br />0.4 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
parallel +  and divergent +
terete +, rolled +  and plicate +
scabridulous +
40 cm400 mm <br />0.4 m <br /> (60 cm600 mm <br />0.6 m <br />) +
Fla. +, Ga. +, La. +, S.C. +  and West Indies (Bahamas) +
0–50 m +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
golden brown +  and brown +
0.2 cm2 mm <br />0.002 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
lanceolate +  and 2-keeled +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
hypogynous +  and subtending +
biconvex +  and trigonous +
Damp grasslands, roadsides, ditches +
digitate +, glomerulate +  and umbellate +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
hemispheric +
subumbellate +  and capitate +
spreading +  and erect +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
0.9 cm9 mm <br />0.009 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
35cm +  and 70cm +
0.4 cm4 mm <br />0.004 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
Fruiting summer. +
2-3(-4)-carpellate +
antrorse +  and extrorse +
3 (?) +  and 1 (?) +
Syn. Pl. Glumac. +
unequal +
5 +  and 9 +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
adventitious +
basal +  and proximal +
cylindric;compressed +
cylindric +
Illustrated +
1.2 cm12 mm <br />0.012 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
35 +  and 50 +
compressed;ovoid +
2.5mm;3.5mm +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
0.5 cm5 mm <br />0.005 m <br /> (?) +
0.2 cm2 mm <br />0.002 m <br /> (?) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
2-3-fid +
1 cm10 mm <br />0.01 m <br /> (?) +
Cyperus virens var. brittonii +
Cyperus distinctus +
Cyperus subg. Pycnostachys +
species +
herb +  and cespitose +