Eleocharis ovata |
Eleocharis flavescens |
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ovate spike-rush, ovoid spike-rush, ovoid spikesedge, éléocharide ovale |
pale spike-rush, wrinkle-sheath spike-rush, yellow spikerush, yellow spikesedge |
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Habit | Plants with creeping rhizomes 0.5–1 mm thick. | |||||
Culms | 2–35 cm × 0.3–1 mm. |
3–42 cm × 0.3–0.6 mm. |
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Leaves | apex of distal leaf sheath obtuse to acute, tooth to 0.2 mm. |
distal leaf sheaths often disintegrating, thinly membranous-translucent, inflated distally, often wrinkled, apex blunt. |
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Spikelets | ovoid, 2–8 × 2–4 mm, apex acute (to blunt); floral scales 25–100+, ca. 10 per mm of rachilla, orange-brown, rarely stramineous, ovate, 1.5–2 × 1 mm, midribs often keeled in distal part of spikelet, apex rounded to subacute. |
ellipsoid, 1.5–9 × 1–3.5 mm, apex acute to acuminate; proximal scale without flower, not amplexicaulous; floral scales to 65, 5–7 per mm of rachilla, loosely appressed to appressed, elliptic, 1–3 × 0.4–1.6 mm, membranous, apex acute. |
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Flowers | perianth bristles present, rarely absent, (5–)6–7, brown, fairly slender, exceeding tubercle; stamens 2(–3); anthers brown, 0.3 mm; styles 2-fid or some 3-fid. |
perianth bristles (0–)5–8, typically 7, white to stramineous, spinules dense to few; styles 2-fid, rarely 3-fid. |
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Achenes | 0.75–1 × 0.6–0.85 mm. |
stramineous to green or dark brown, biconvex, rarely trigonous, obovoid to obpryiform, 0.4–1.1 × 0.3–0.8 mm, very finely reticulate at 40X. |
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Tubercles | deltoid, 0.3–0.5 × 0.3–0.5 mm, 3/5 of to as high as wide, 1/3–2/3 as high and 1/2–3/4 as wide as achene. |
whitish to stramineous or green, 0.2–0.7 × 0.2–0.4 mm, apex acute to acuminate. |
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2n | = 10. |
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Eleocharis ovata |
Eleocharis flavescens |
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Phenology | Fruiting summer–fall. | |||||
Habitat | Fresh, often drying shores, lake and stream beds, bogs, tidal estuaries, disturbed places | |||||
Elevation | 10–700 m (East), 1500–2000 m (Arizona) (0–2300 ft (East), 4900–6600 ft (Arizona)) | |||||
Distribution |
AZ; CT; IA; IL; IN; KY; MA; ME; MI; MN; MO; NH; NJ; NY; OH; OK; OR; PA; VA; VT; WA; WI; WV; AB; BC; NB; NL; NS; ON; PE; QC; Eurasia
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AL; AR; AZ; CA; CT; DE; FL; GA; ID; IL; IN; LA; MA; MD; ME; MI; MN; MS; MT; NC; NH; NJ; NY; OH; PA; RI; SC; TX; UT; VA; VT; WI; WY; NB; NS; ON; QC; South America; temperate North America; West Indies
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Discussion | Although Eleocharis ovata has often been confused with E. obtusa, B. M. H. Larson and P. M. Catling (1996) showed that these species may be distinguished by non-overlapping widths of the tubercles, at least in Canada. The records of E. ovata in New Brunswick, Newfoundland, Nova Scotia, and Prince Edward Island are based on B. M. H. Larson and P. M. Catling (1996) and the records in Illinois, Indiana, Missouri, Montana, New Jersey, Oregon, and Washington are based on D. M. Hines (1975). Eleocharis ovata probably also occurs in Manitoba and Saskatchewan. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). The varieties of Eleocharis flavescens are difficult to delimit, especially in the south, and identifications of some specimens to variety are problematic. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 23, p. 103. | FNA vol. 23, p. 100. | ||||
Parent taxa | Cyperaceae > Eleocharis > subg. Eleocharis > sect. Eleogenus > ser. Ovatae | Cyperaceae > Eleocharis > subg. Eleocharis > sect. Eleogenus > ser. Maculosae | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Scirpus ovatus, E. obtusa var. ovata, E. ovata var. heuseri | Scirpus flavescens | ||||
Name authority | (Roth) Roemer & Schultes: in J. J. Roemer et al., Syst. Veg. 2: 152. (1817) | (Poiret) Urban: Symb. Antill. 4: 116. (1903) | ||||
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