Eleocharis ovata |
Eleocharis melanocarpa |
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ovoid spikerush |
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Habit | Plants annual, tufted. | |
Culms | terete, 2–35 cm × 0.3–1 mm. |
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Spikes | ovoid, 2–8 × 2–4 mm; floral scales 25–100+, approximately 10 per mm of rachilla, 1.5–2 × 1 mm; midribs often keeled in distal part of spike; apex rounded to subacute. |
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Flowers | perianth bristles present, rarely absent; (5)6–7, exceeding tubercle; stamens 2(3); anthers 0.3 mm; stigmas 2 or some 3. |
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Achenes | biconvex or to 33% greatly compressed trigonous, 0.75–1 × 0.6–0.85 mm. |
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Distal leaf sheaths | persistent, apex of distal leaf sheath obtuse to acute; tooth to 0.2 mm. |
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Tubercles | deltoid, 0.3–0.5 × 0.3–0.5 mm, 60% to as high as wide, 33–67% as high and 50–75% as wide as achene. |
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2n | =10. |
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Eleocharis ovata |
Eleocharis melanocarpa |
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Distribution | ||
Discussion | Freshwater shores exposed by seasonal low water levels, marshes, and disturbed wetlands. 100–1300 m. ECas, Sisk, WV. WA; north to British Columbia; northeastern North America. Native? Pacific Northwest occurrences of E. ovata are disjunct from the species northeastern North American range. This may suggest that the species is introduced in Oregon. More research is needed. |
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Source | Flora of Oregon, volume 1, page 242 Barbara Wilson, Richard Brainerd, Nick Otting |
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Sibling taxa | ||
Web links |
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