Cyperus dentatus

Torrey

Fl. N. Middle United States 1: 61. 1824.

IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 151. Mentioned on page 144, 150.

Herbs, perennial, cespitose, rhizomatous; stolons tuberiferous, 1–10 cm. Culms trigonous, 8–50 cm × 1–3 mm. Leaves flat or V-shaped, 10–40 cm × 2–5 mm. Inflorescences: heads digitate, 8–18 mm diam.; rays 4–9, 1–8 cm; 2d order rays 0.5–2 cm; bracts 3–5, ± horizontal, flat, 1–20 cm × 1–4 mm. Spikelets commonly proliferous, 2–6, linear to oblong, compressed, 3–24 × 2–2.5 mm; floral scales 3–20 (–50), reddish-brown, laterally 1–3-ribbed, ovate, 2–2.5 × 1.5–2 mm. Flowers: stamens 3; anthers 1.5 mm; styles 1 mm; stigmas 1.5 mm. Achenes reddish-brown, sessile, obovoid, 0.8–1 × 0.4–0.5 mm, apex obtuse, scarcely apiculate, surfaces glabrous.


Phenology: Fruiting summer.
Habitat: Emergent sandy, peaty, or gravelly shorelines
Elevation: 0–600 m

Distribution

V23 229-distribution-map.jpg

N.B., N.S., Ont., Que., Conn., Del., D.C., Ind., Maine., Md., Mass., N.H., N.Y., N.C., Pa., R.I., S.C., Tenn., Vt., Va.

Discussion

The report of Cyperus dentatus from West Virginia (M. V. McGivney 1938) is erroneous; the cited specimen was from New Jersey (Gutenberg s.n. 1886, US) (M. Strong, pers. comm.).

Selected References

None.

Lower Taxa

None.
... more about "Cyperus dentatus"
reddish-brown +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.4mm;0.5mm +
1.5 cm15 mm <br />0.015 m <br /> (?) +
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Torrey +
shortened +
persistent +  and deciduous +
decurrent +
w--shaped +  and keeled +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
1 cm10 mm <br />0.01 m <br /> (20 cm200 mm <br />0.2 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
parallel +  and divergent +
terete +, rolled +  and plicate +
8 cm80 mm <br />0.08 m <br /> (50 cm500 mm <br />0.5 m <br />) +
scabridulous +
trigonous +
1mm;3mm +
N.B. +, N.S. +, Ont. +, Que. +, Conn. +, Del. +, D.C. +, Ind. +, Maine. +, Md. +, Mass. +, N.H. +, N.Y. +, N.C. +, Pa. +, R.I. +, S.C. +, Tenn. +, Vt. +  and Va. +
0–600 m +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
hypogynous +  and subtending +
biconvex +  and trigonous +
Emergent sandy, peaty, or gravelly shorelines +
0.8 cm8 mm <br />0.008 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
subumbellate +  and capitate +
spreading +  and erect +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
10cm +  and 40cm +
v--shaped +  and flat +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
Fruiting summer. +
2-3(-4)-carpellate +
antrorse +  and extrorse +
3 (?) +  and 1 (?) +
Fl. N. Middle United States +
unequal +
4 +  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 +  and Endemic +
0.3 cm3 mm <br />0.003 m <br /> (2.4 cm24 mm <br />0.024 m <br />) +
compressed;linear;oblong +
2mm;2.5mm +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
1.5 cm15 mm <br />0.015 m <br /> (?) +
2-3-fid +
1 cm10 mm <br />0.01 m <br /> (?) +
Cyperus subg. Protocyperus +
Cyperus dentatus +
Cyperus subg. Pycnostachys +
species +
herb +  and cespitose +