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Cyperus acuminatus Torr. & Hook.

Tapertip flatsedge (en), Souchet lisse (fr), Petit-jonc lisse (fr)

Species

Angiosperms > Poales > Cyperaceae > Cyperus

Characteristics

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, ovate-lanceolate, 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.
More
Tufted annual 0.5–4 dm; lvs few, all near the base, slender and ± elongate, 1–2(–3) mm wide; invol bracts 3–6, unequal, elongate, some or all much surpassing the infl;spikelets 3–7 mm, strongly flattened, 8–20(–40)-fld, borne in very dense, globose clusters on very short axes; scales 1.3–2 mm, ovate, bicarinate basally, strongly 3-nerved, otherwise subhyaline and cellular-reticulate, shortly recurved-acuminate at the tip; rachilla persistent, wingless; stamen 1; anthers 0.5–0.7 mm; achenes rather broadly trigonous, 0.6–1 mm. Streambanks and other wet, low places, tolerant of alkali; Ill. to N.D., Mo., Tex., and n. Mex., e. occasionally to O., Ky. and w. N.C., and w. irregularly to the Pacific.
Life form annual
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 0.4
Root system -
Rooting depth (meter) 0.2
Root diameter (meter) -
Flower color -
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

Light 5-7
Soil humidity 8-9
Soil texture 1-2
Soil acidity 2-6
Soil nutriment -
Hardiness (USDA) 4-9

Usage

Uses -
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Can be grown by cuttings.
Mode cuttings
Germination duration (days) 25 - 30
Germination temperacture (C°) 21 - 23
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Cyperus acuminatus unspecified picture

Distribution

Cyperus acuminatus world distribution map, present in Åland Islands, Canada, Colombia, Micronesia (Federated States of), Nicaragua, and United States of America

Identifiers

LSID urn:lsid:ipni.org:names:74443-2
WFO ID wfo-0000367440
COL ID 33BGJ
BDTFX ID 20695
INPN ID 93891
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Cyperus acuminatus Cyperus cyrtolepis Cyperus acuminatus var. cyrtolepis Cyperus cyrtolepis var. denticarinatus Cyperus rufescens var. denticarinatus Cyperus cyrtolepis var. caepitosus Cyperus cyrtolepis var. glaucescens
WorldFloraDB 2024