Cyperus pseudovegetus

Steudel

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

IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 156. Mentioned on page 143.

Herbs, perennial, cespitose; rhizomes upright, 5–8 mm diam., indurate. Culms trigonous, 30–50 (–80) cm × 1.8–2.5 mm, glabrous. Leaves 4–7 (–10), V-shaped, (20–) 40–60 cm × 4.5–8 mm. Inflorescences: heads dense, hemispheric, 7–15 (–18) mm diam; or if rays absent, heads dense, irregularly lobate, 2–3.5 cm diam.; rays 3–6, 1–30 mm; 2d order rays infrequently present, to 5 mm; bracts (5–) 10–15 (–40), horizontal to ascending at 30 (–45) °, V-shaped, 6–30 (–40) cm × 5–8 (–10) mm. Spikelets 40–100, greenish white, flattened, ovoid, 3.5–5 × 3–4 mm; floral scales (8–) 12–16, uniformly light greenish to light-brown, laterally 1-ribbed, medially indistinctly 3-ribbed, basally 2-keeled, oblong-spatulate, widest at or above median, 2–2.5 × (0.7–) 1–1.2 mm, apex minutely mucronate, scabridulous, infrequently glabrous. Flowers: stamen 1; anthers oblong, 0.7–1 mm, connective apex subulate, prolonged 0.1–0.2 mm; styles thick, confluent with apex of, and persistent on, achene, 0.5–0.8 mm; stigmas 0.6–1 mm. Achenes brown, stipitate, linear, slightly curved, 1.2–1.4 × 0.2 (–0.3) mm, base whitish, stipe spongy, 0.1–0.2 × 0.2 mm, apex acute, surfaces papillose.


Phenology: Fruiting summer.
Habitat: Damp places
Elevation: 0–200 m

Distribution

V23 242-distribution-map.jpg

Ala., Ark., Del., D.C., Fla., Ga., Ill., Ind., Kans., Ky., La., Md., Mass., Mo., N.J., N.C., Okla., S.C., Tenn., Tex., Va.

Discussion

Cyperus pseudovegetus has been called “Cyperus vegetus Willd.” (M. L. Fernald 1950). The var. megalanthus Kükenthal of eastern Mexico and Central America recognized by M. F. Denton (1978b) is now considered a distinct species, C. megalanthus (Kükenthal) G. C. Tucker (see G. C. Tucker 1994).

Cyperus pseudovegetus is introduced in Massachusetts.

Selected References

None.

Lower Taxa

None.

"shortened" is not a number."widest" is not a number.

... more about "Cyperus pseudovegetus"
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
terete;planoconvex;terete;planoconvex;trigonous +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
scabridulous +
acute;mucronate +
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Steudel +
persistent +  and deciduous +
decurrent +
w--shaped +  and keeled +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
30 cm300 mm <br />0.3 m <br /> (40 cm400 mm <br />0.4 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
6 cm60 mm <br />0.06 m <br /> (30 cm300 mm <br />0.3 m <br />) +
horizontal +  and ascending +
v--shaped +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
parallel +  and divergent +
terete +, rolled +  and plicate +
50 cm500 mm <br />0.5 m <br /> (80 cm800 mm <br />0.8 m <br />) +
30 cm300 mm <br />0.3 m <br /> (50 cm500 mm <br />0.5 m <br />) +
scabridulous +
trigonous +
1.8mm;2.5mm +
Ala. +, Ark. +, Del. +, D.C. +, Fla. +, Ga. +, Ill. +, Ind. +, Kans. +, Ky. +, La. +, Md. +, Mass. +, Mo. +, N.J. +, N.C. +, Okla. +, S.C. +, Tenn. +, Tex. +  and Va. +
0–200 m +
3-ribbed +  and 1-ribbed +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
uniformly light greenish +  and light-brown +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
oblong-spatulate +  and 2-keeled +
hypogynous +  and subtending +
biconvex +  and trigonous +
Damp places +
digitate +, glomerulate +  and umbellate +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
lobate +  and hemispheric +
subumbellate +  and capitate +
spreading +  and erect +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
20 cm200 mm <br />0.2 m <br /> (40 cm400 mm <br />0.4 m <br />) +
40 cm400 mm <br />0.4 m <br /> (?) +  and 60 cm600 mm <br />0.6 m <br /> (?) +
v--shaped +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.12 cm1.2 mm <br />0.0012 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 +
3 +  and 6 +
0 cm0 mm <br />0 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
adventitious +
basal +  and proximal +
cylindric;compressed +
cylindric +
W1 +, Illustrated +  and Endemic +
greenish white +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
40 +  and 100 +
ovoid;flattened +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (?) +  and 0.02 cm0.2 mm <br />2.0e-4 m <br /> (?) +
0.2 cm2 mm <br />0.002 m <br /> (?) +
persistent +
2-3-fid +
papillose +
Cyperus subg. Protocyperus +
Cyperus pseudovegetus +
Cyperus subg. Pycnostachys +
species +
tuberous +, stoloniferous +  and rhizomatous +
herb +  and cespitose +