Cyperus acuminatus

Torrey & Hooker

Ann. Lyceum Nat. Hist. New York 3: 435. 1836.

Illustrated
Synonyms: Cyperus acuminatus var. cyrtolepis (Torrey & Hooker) Kükenthal Cyperus cyrtolepis Torrey & Hooker Cyperus cyrtolepis var. denticarinatus (Britton) Britton Cyperus rufescens var. denticarinatus Britton
Treatment appears in FNA Volume 23. Treatment on page 152. Mentioned on page 143, 150, 165.

Herbs, annual, cespitose. Culms roundly trigonous, (10–) 20–30 (–45) cm × 0.4–1.2 mm, distal 1/2 glabrous or infrequently scabridulous. Leaves 2–6 (–8), V-shaped or flat, 8–12 (–16) cm × 1–2 (–4) mm. Inflorescences: heads hemispheric, 7–12 (–15) mm diam.; rays 1–3 (–5), 0.5–2 cm; bracts 3–6, longest erect to ascending, flat to V-shaped, (1.5–) 3–12 (–25) cm × 1–2.5 (–3.5) mm. Spikelets (15–) 25–50 (–75), ovoid, compressed, 4–7 × 2–3 mm; floral scales 8–20 (–35), laterally yellowish, yellowish green, or light reddish-brown, medially light-brown or greenish brown, 2-keeled, subtly 1-ribbed, ovatelanceolate, 1–2 × 1–1.4 mm, apex acute, mucronate, straight to excurved, glabrous or sparsely scabridulous. Flowers: stamen 1; anthers 0.5 mm; styles 0.8–1.1 mm; stigmas 0.5 mm. Achenes brown, stipitate, broadly ellipsoid, abruptly contracted to base, 0.8–1.1 × 0.3–0.4 mm, stipe 0.1 mm, apex acute, tapering to slender beak formed of persistent style base, surfaces papillose.


Phenology: Fruiting summer–fall (Jul–Oct).
Habitat: Wet, often sandy shores and damp, disturbed soils
Elevation: 0–1500 m

Distribution

V23 233-distribution-map.jpg

Ala., Ariz., Ark., Calif., Colo., Ill., Ind., Iowa, Kans., Ky., La., Mich., Minn., Mo., Mont., Nebr., N.H., N.Y., N.C., N.Dak., Ohio, Okla., Oreg., Pa. (?), S.Dak., Tenn., Tex., Utah, Va., Wash., Wyo., Mexico (Coahuila), Mexico (Tamaulipas)

Discussion

Cyperus acuminatus may be introduced in New Hampshire and New York.

Selected References

None.

Lower Taxa

None.
... more about "Cyperus acuminatus"
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
ellipsoid +
0.3mm;0.4mm +
0.5 cm5 mm <br />0.005 m <br /> (?) +
straight +
scabridulous +
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Torrey & Hooker +
shortened +
persistent +  and deciduous +
decurrent +
w--shaped +  and keeled +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
12 cm120 mm <br />0.12 m <br /> (25 cm250 mm <br />0.25 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
3 cm30 mm <br />0.03 m <br /> (12 cm120 mm <br />0.12 m <br />) +
erect +  and ascending +
flat +  and v-shaped +
0.1 cm1 mm <br />0.001 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
parallel +  and divergent +
terete +, rolled +  and plicate +
30 cm300 mm <br />0.3 m <br /> (45 cm450 mm <br />0.45 m <br />) +
20 cm200 mm <br />0.2 m <br /> (30 cm300 mm <br />0.3 m <br />) +
scabridulous +
trigonous +
0.4mm;1.2mm +
Ala. +, Ariz. +, Ark. +, Calif. +, Colo. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Mich. +, Minn. +, Mo. +, Mont. +, Nebr. +, N.H. +, N.Y. +, N.C. +, N.Dak. +, Ohio +, Okla. +, Oreg. +, Pa. (?) +, S.Dak. +, Tenn. +, Tex. +, Utah +, Va. +, Wash. +, Wyo. +, Mexico (Coahuila) +  and Mexico (Tamaulipas) +
0–1500 m +
greenish brown +, light-brown +, light reddish-brown +, yellowish green +  and yellowish +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
ovatelanceolate +  and 2-keeled +
0.1 cm1 mm <br />0.001 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
hypogynous +  and subtending +
biconvex +  and trigonous +
Wet, often sandy shores and damp, disturbed soils +
digitate +, glomerulate +  and umbellate +
0.7 cm7 mm <br />0.007 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
hemispheric +
subumbellate +  and capitate +
spreading +  and erect +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
12 cm120 mm <br />0.12 m <br /> (16 cm160 mm <br />0.16 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
8cm +  and 12cm +
flat +  and v--shaped +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
Fruiting summer–fall (Jul–Oct). +
2-3(-4)-carpellate +
antrorse +  and extrorse +
3 (?) +  and 1 (?) +
Ann. Lyceum Nat. Hist. New York +
unequal +
1 +  and 3 +
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 +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
25 +  and 50 +
compressed;ovoid +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
0.5 cm5 mm <br />0.005 m <br /> (?) +
0.1 cm1 mm <br />0.001 m <br /> (?) +
2-3-fid +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
papillose +
Cyperus acuminatus var. cyrtolepis +, Cyperus cyrtolepis +, Cyperus cyrtolepis var. denticarinatus +  and Cyperus rufescens var. denticarinatus +
Cyperus acuminatus +
Cyperus subg. Pycnostachys +
species +
tuberous +, stoloniferous +  and rhizomatous +
herb +  and cespitose +