Cyperus articulatus

Linnaeus

Sp. Pl. 1: 44. 1753.

Illustrated
Synonyms: Cyperus articulatus var. multiflorus Kükenthal Cyperus articulatus var. nodosus (Willdenow) Kükenthal Cyperus corymbosus var. subnodosus (Nees & Meyen) Kükenthal Cyperus nodosus Cyperus nodosus var. subnodosus (Nees & Meyen) Boeckeler Cyperus subnodosus
Treatment appears in FNA Volume 23. Treatment on page 167. Mentioned on page 146, 168.

Herbs perennial; rhizomes to 200 cm. Culms to 25 cm apart, 1 (–3) together, terete (scarcely compressed in drying), occasionally trigonous for apical 1/3, 40–140 (–200) cm, 4–12 mm thick at base, (1.2–) 1.5–2.5 mm thick at apex (with conspicuous transverse septa ca. 3 cm apart basally, to 3–5 mm apart apically), glabrous or infrequently scabrid on angles apically; sheaths at base of culm, 2–3, (5–) 10–25 cm, loose, papery. Leaves usually bladeless, blades when present, cross ribs prominent, especially adaxially, (1–) 10–20 (–40) cm × 4–6 (–9) mm. Inflorescences: spikes 1 (–5), broadly ovoid to ± umbellate, 15–45 × 10–30 mm; rays 5–7 (–10), 0.3–8 (–12) cm; 2d order rays occasionally present, 5–20 mm; bracts 2 (–4), erect, longest appearing to continuation of culm, deltate to lance-linear, 0.2–2 (–9) cm × 1.5–4.5 mm; rachilla persistent, wings translucent, whitish, or stramineous, 0.4 mm wide. Spikelets (1–) 5–10, linear, compressed, 10–35 (–45) × 1.1–2 mm; floral scales deciduous, 15–45, spreading or appressed, laterally light-brown, medially green to brown, laterally 1–2-ribbed, medially 3-ribbed, oblongelliptic to ovate, 2.9–3.7 × 1.1–1.6 (–1.8) mm, apex acute. Flowers: anthers 1.7–2.4 mm; styles 1.2–3.6 mm; stigmas 1.7–6 mm. Achenes brown, stipitate, obovoidellipsoid, 1.2–1.6 × 0.4–0.6 mm, stipe 0.1 mm, apex markedly apiculate, surfaces puncticulate.


Phenology: Fruiting summer.
Habitat: Marshes, shallow water, ditches
Elevation: 0–100 m

Distribution

V23 272-distribution-map.jpg

Ala., Fla., Ga., La., Miss., S.C., Tex., Mexico, Central America, South America, Asia, Africa

Discussion

In habit, Cyperus articulatus is reminscent of larger plants of Juncus or Schoenoplectus and is the only North American Cyperus with such a reedlike appearance.

Selected References

None.

Lower Taxa

None.
... more about "Cyperus articulatus"
0.12 cm1.2 mm <br />0.0012 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
flattened;trigonous +
0.4mm;0.6mm +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Linnaeus +
shortened +
persistent +  and deciduous +
decurrent +
w--shaped +  and keeled +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
2 cm20 mm <br />0.02 m <br /> (9 cm90 mm <br />0.09 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (2 cm20 mm <br />0.02 m <br />) +
deltate +  and lance-linear +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
parallel +  and divergent +
terete +, rolled +  and plicate +
scabrid +  and glabrous +
scabridulous +
trigonous +  and terete +
40 cm400 mm <br />0.4 m <br /> (140 cm1,400 mm <br />1.4 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Ala. +, Fla. +, Ga. +, La. +, Miss. +, S.C. +, Tex. +, Mexico +, Central America +, South America +, Asia +  and Africa +
0–100 m +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
medially green +  and brown +
0.29 cm2.9 mm <br />0.0029 m <br /> (0.37 cm3.7 mm <br />0.0037 m <br />) +
appressed +  and spreading +
oblongelliptic +  and ovate +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
hypogynous +  and subtending +
biconvex +  and trigonous +
Marshes, shallow water, ditches +
subumbellate +  and capitate +
spreading +  and erect +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
with (1-)3-6(-30) bristles and/or scales +
Fruiting summer. +
2-3(-4)-carpellate +
antrorse +  and extrorse +
3 (?) +  and 1 (?) +
continuous +, articulate +, winged +  and wingless +
conspicuous +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
unequal +
5 +  and 7 +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0 cm0 mm <br />0 m <br /> (200 cm2,000 mm <br />2 m <br />) +
20 cm200 mm <br />0.2 m <br /> (40 cm400 mm <br />0.4 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
prominent +
4mm;6mm +
adventitious +
basal +  and proximal +
cylindric;compressed +
5 cm50 mm <br />0.05 m <br /> (10 cm100 mm <br />0.1 m <br />) +
cylindric +
10 cm100 mm <br />0.1 m <br /> (25 cm250 mm <br />0.25 m <br />) +
W1 +  and Illustrated +
1.5 cm15 mm <br />0.015 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
3.5 cm35 mm <br />0.035 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
5 +  and 10 +
compressed +
1.1mm;2mm +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (?) +
2-3-fid +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.36 cm3.6 mm <br />0.0036 m <br />) +
Cyperus articulatus var. multiflorus +, Cyperus articulatus var. nodosus +, Cyperus corymbosus var. subnodosus +, Cyperus nodosus +, Cyperus nodosus var. subnodosus +  and Cyperus subnodosus +
Cyperus articulatus +
Cyperus subg. Cyperus +
species +
tuberous +, stoloniferous +  and rhizomatous +
stramineous +, whitish +  and translucent +