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red-rooted flatsedge

Habit Plants annual, cespitose.
Culms

trigonous to roundly trigonous; (0.5)5–25(105) cm × 1–2.5(7.5) mm.

Leaves

5–25(90) cm × 2–5(11) mm.

Inflorescences

clusters cylindric; dense, 1–3(6); (4)10–30(45) × (6)10– 16(23) mm;

rays 2–6(12), 1–8(28) cm long;

inflorescence bracts horizontal to ascending at 30°.

Spikes

(20)40–80, linear, quadrangular in cross section, 3–8(11) × 1–1.5 mm;

rachilla persistent; at maturity becoming laterally free, remaining firmly attached proximally;

wings 0.3(0.4) mm wide; floral scales deciduous, 6–16(30), appressed, oblong-ovate to obovate, 1.3–1.5 × 0.8–1.2 mm, light brown with reddish speckles and greenish midstripe;

lateral ribs 0; medial ribs 3;

apex obtuse, mucronulate.

Flowers

anthers 0.2–0.3 mm;

styles 0.7–0.8 mm;

stigmas 0.4 mm.

Achenes

ovoid; (0.4)0.7–1 × 0.4–0.6 mm.

Cyperus hermaphroditus

Cyperus erythrorhizos

Distribution
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Shorelines exposed by low water levels. 0–700 m. Casc, Col, CR, ECas, Est, Owy, Sisk, WV. CA, NV, WA; throughout most of US and southern Canada, south to Mexico. Native.

Source Flora of Oregon, volume 1, page 235
Barbara Wilson, Richard Brainerd, Nick Otting
Sibling taxa
C. acuminatus, C. aggregatus, C. bipartitus, C. difformis, C. eragrostis, C. erythrorhizos, C. esculentus, C. fuscus, C. niger, C. odoratus, C. schweinitzii, C. squarrosus, C. strigosus
C. acuminatus, C. aggregatus, C. bipartitus, C. difformis, C. eragrostis, C. esculentus, C. fuscus, C. niger, C. odoratus, C. schweinitzii, C. squarrosus, C. strigosus
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