Cyperus strigosus

Linnaeus

Sp. Pl. 1: 47. 1753.

Common names: False nutsedge
IllustratedEndemic
Synonyms: Cyperus hansenii Britton Cyperus stenolepis Torrey Cyperus strigosus var. hansenii (Britton) Kükenthal Cyperus strigosus var. stenolepis (Torrey) Kükenthal Mariscus stenolepis Mariscus strigosus
Treatment appears in FNA Volume 23. Treatment on page 184. Mentioned on page 146, 148, 182, 183, 185.

Herbs, perennial (often flowering first-year), rhizomatous. Culms basally swollen and cormlike, trigonous, (1–) 20–40 (–90) cm × 1–6 mm, glabrous or few prickles subapically. Leaves flat, (10–) 20–40 cm × 1–4 (–8) mm, margins and midribs glabrous or scabridulous. Inflorescences: spikes 1–4, loosely ovoid to oblong-cylindric; (6–) 10–28 (–50) × 10–40 mm; rays sometimes absent, usually (1–) 3–6 (–8), 0.5–7 (–25) cm; if absent, inflorescence a congested head; 2d order rays sometimes present, 1–4 (–9) cm; rachis 8–18 (–25) mm; bracts (3–) 5–7 (–10), ascending at 30–45°, cross ribs sometimes conspicuous, (1–) 10–30 (–45) cm × (1–) 2–4 (–12) mm; rachilla ± deciduous, wings 0.4–0.5 mm wide. Spikelets (5–) 12–50, linear-lanceoloid, compressed, 5–30 × 0.6–0.9 mm; floral scales ± deciduous, 3–11, appressed, medially green, laterally stramineous to pale-brown, 3–4-ribbed laterally, (1–) 3-ribbed medially, oblong-obovate, 3.2–4.5 (–6) × 1–1.8 mm, apex ± acute, overlapping lower 1/4–1/2 of next scale. Flowers: anthers 0.3–0.5 mm; styles 1–2 mm; stigmas 3–4 mm. Achenes purplish brown, ± stipitate, narrowly oblong, (1.5–) 1.8–2.4 × 0.5–0.6 mm, apex apiculate, acute, surfaces puncticulate.


Phenology: Fruiting summer.
Habitat: Pond shores, ditches, damp, disturbed soils, sometimes weeds of gardens or croplands
Elevation: 0–1500 m

Distribution

V23 316-distribution-map.jpg

Man., Ont., Que., Sask., Ala., Ariz., Ark., Calif., Colo., Conn., Del., D.C., Fla., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.C., Ohio, Okla., Oreg., Pa., R.I., S.C., S.Dak., Tenn., Tex., Utah, Vt., Va., Wash., W.Va., Wis.

Discussion

Cyperus strigosus is usually among the more common Cyperus species throughout its range. Small individuals flowering the first year may be difficult to distinguish from C. polystachyos, C. odoratus, C. erythrorhizos, and C. esculentus, which may be sympatric. Cyperus strigosus has trigonous achenes and three stigmas, unlike C. polystachyos; C. strigosus has flattened spikelets, unlike the subcylindric ones of C. odoratus; C. strigosus has floral scales usually 3 mm or more, unlike the smaller (1.2–1.5 mm) ones of C. erythrorhizos; C. strigosus has deciduous floral scales and a cormlike stem base with stolons, unlike C. esculentus.

Cyperus strigosus appears to be closely related to the neotropical C. camphoratus Liebmann; both species have deciduous floral scales and deciduous spikelets (G. C. Tucker 1994). Plants segregated as C. stenolepis cannot be distinguished consistently from C. strigosus on any single charcter, rather they appear to be merely large individuals of C. strigosus with long floral scales and frequently septate inflorescence bracts (M. L. Horvat 1941).

Selected References

None.

Lower Taxa

None.
... more about "Cyperus strigosus"
0.15 cm1.5 mm <br />0.0015 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
purplish brown +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
0.5mm;0.6mm +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
overlapping +
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 +
parallel +  and divergent +
terete +, rolled +  and plicate +
False nutsedge +
40 cm400 mm <br />0.4 m <br /> (90 cm900 mm <br />0.9 m <br />) +
20 cm200 mm <br />0.2 m <br /> (40 cm400 mm <br />0.4 m <br />) +
scabridulous +
trigonous +  and swollen +
1mm;6mm +
Man. +, Ont. +, Que. +, Sask. +, Ala. +, Ariz. +, Ark. +, Calif. +, Colo. +, Conn. +, Del. +, D.C. +, Fla. +, Ga. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, Nebr. +, Nev. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, Ohio +, Okla. +, Oreg. +, Pa. +, R.I. +, S.C. +, S.Dak. +, Tenn. +, Tex. +, Utah +, Vt. +, Va. +, Wash. +, W.Va. +  and Wis. +
0–1500 m +
(1-)3-ribbed +  and 3-4-ribbed +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
laterally stramineous +  and pale-brown +
0.32 cm3.2 mm <br />0.0032 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
oblong-obovate +
0.1 cm1 mm <br />0.001 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
hypogynous +  and subtending +
biconvex +  and trigonous +
Pond shores, ditches, damp, disturbed soils, sometimes weeds of gardens or croplands +
subumbellate +  and capitate +
2.8 cm28 mm <br />0.028 m <br /> (5 cm50 mm <br />0.05 m <br />) +
spreading +  and erect +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
20cm +  and 40cm +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
scabridulous +
scabridulous +
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 +
1.8 cm18 mm <br />0.018 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
conspicuous +
4 cm40 mm <br />0.04 m <br /> (9 cm90 mm <br />0.09 m <br />) +
unequal +
3 +  and 6 +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
30 cm300 mm <br />0.3 m <br /> (45 cm450 mm <br />0.45 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
conspicuous +
2mm;4mm +
adventitious +
basal +  and proximal +
cylindric;compressed +
cylindric +
W2 +, W1 +, Illustrated +  and Endemic +
loosely ovoid;oblong-cylindric +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
12 +  and 50 +
compressed;linear-lanceoloid +
0.6mm;0.9mm +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
2-3-fid +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Cyperus hansenii +, Cyperus stenolepis +, Cyperus strigosus var. hansenii +, Cyperus strigosus var. stenolepis +, Mariscus stenolepis +  and Mariscus strigosus +
Cyperus strigosus +
Cyperus subg. Cyperus +
species +
0.4mm +  and 0.5mm +