Cyperus surinamensis |
Cyperus erythrorhizos |
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red-rooted flatsedge |
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Habit | Plants annual, cespitose. | |
Culms | trigonous to roundly trigonous; (0.5)5–25(105) cm × 1–2.5(7.5) mm. |
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Leaves | 5–25(90) cm × 2–5(11) mm. |
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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°. |
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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. |
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Flowers | anthers 0.2–0.3 mm; styles 0.7–0.8 mm; stigmas 0.4 mm. |
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Achenes | ovoid; (0.4)0.7–1 × 0.4–0.6 mm. |
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Cyperus surinamensis |
Cyperus erythrorhizos |
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Distribution | ||
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. |
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Source | Flora of Oregon, volume 1, page 235 Barbara Wilson, Richard Brainerd, Nick Otting |
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Sibling taxa | ||
Web links |
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