Cyperus lanceolatus |
Cyperus squarrosus |
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awned flatsedge |
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Habit | Plants annual, cespitose, with fibrous roots. | |
Culms | 1–20, trigonous, 2–16 cm × 0.5–0.8 mm. |
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Leaves | (1)5–10(15) × 0.5–2.5 mm. |
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Inflorescences | clusters usually densely head-like to cylindric, 1, loosely to densely ovoid to oblong, 6–20(40) × 9–15(20) mm; rays absent or 1–3(6), 0.4–4 cm; longest inflorescence bracts more or less erect. |
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Spikes | (2)6–20(40); ovoid-lanceoloid to oblong; somewhat compressed, 2.5–10(20) × 1.3–2.2 mm (excluding awns); greenish to reddish brown; rachilla more or less deciduous; wingless; floral scales deciduous; (4)10–20(34), oblong-lanceolate; (1.2)1.3–1.8(2.2) × (0.5)0.7–0.8(1) mm; greenish to stramineous or brownish red with greenish mid-stripe; (5)7–9(11)-ribbed nearly to margins; apex awned; the strongly outcurved awn an additional 0.5–1(1.3) mm. |
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Flowers | anthers 0.2–0.3 mm; styles 0.3–0.5 mm; stigmas 0.4–0.7 mm. |
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Achenes | obovoid (occasionally linear-spatulate or linear-oblong), 0.7–0.8(1.1) × (0.2)0.3–0.4(0.5) mm; stipe 0.05–0.1 × 0.1 mm. |
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Cyperus lanceolatus |
Cyperus squarrosus |
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Distribution | ||
Discussion | Lake shores and river margins exposed as water falls, puddles, disturbed shallow wetlands. 0–1300 m. BR, BW, Col, CR, ECas, Lava, Owy, Sisk, WV. CA, ID, NV, WA; throughout US and adjacent Canada, south to South America; nearly cosmopolitan. Native. Cyperus squarrosus is easily recognized by its small size, strongly outcurved scale awns, and many-veined scales. It is sometimes confused with C. acuminatus, which has 3-veined floral scales. |
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Source | Flora of Oregon, volume 1, page 237 Barbara Wilson, Richard Brainerd, Nick Otting |
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Sibling taxa | ||
Synonyms | Cyperus aristatus, Cyperus inflexus | |
Web links |
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