Cyperus hermaphroditus |
Cyperus bipartitus |
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shining flatsedge |
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Habit | Plants annual, densely cespitose, with fibrous roots. | |
Culms | roundly trigonous, 3–25(30) cm × 0.3–1.4 mm. |
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Leaves | 1–8 cm × 1–2 mm. |
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Inflorescences | cluster head-like, 1, loosely ovoid, compressed, 7–14 × 9–14 mm; rays 1–4; to 2(3) cm; inflorescence bracts 2–3; horizontal to ascending at 45(75)°. |
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Spikes | 3–5(8), flattened, oblong to oblong-lanceoloid, 8–18 × 2–2.6(3) mm; floral scales (6)10–26(32), closely overlapping, 1.9–2.7 × 1.8–2.3 mm, oblong to ovate; light to dark brown, with light brown mid-stripe; lateral ribs 0; medial ribs 2–3, 2-keeled; apex obtuse. |
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Flowers | anthers 0.4–0.5 mm; styles 0.6–1 mm; stigmas 1–1.5 mm. |
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Achenes | with network of ridges forming isodiametric or square cells, obovoid to ovoid, 1–1.3(1.5) × (0.6)0.8 mm. |
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Cyperus hermaphroditus |
Cyperus bipartitus |
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Distribution | ||
Discussion | Shorelines exposed by seasonal low water levels, ditches, disturbed wetlands. 0–800 m. Col, CR, Sisk, WV. CA, ID, NV, WA; northeastern Canada, most of US, south to South America. Native. Cyperus bipartitus closely resembles C. niger, a taller rhizomatous perennial with clustered shoots that are often collected without the rhizomes. |
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Source | Flora of Oregon, volume 1, page 235 Barbara Wilson, Richard Brainerd, Nick Otting |
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Sibling taxa | ||
Synonyms | Cyperus niger var. rivularis, Cyperus rivularis | |
Web links |
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