Eleocharis ovata

(Roth) Roemer & Schultes in J. J. Roemer et al.

in J. J. Roemer et al., Syst. Veg. 2: 152. 1817.

Common names: Ovate spike-rush éléocharide ovale
Illustrated
Basionyms: Scirpus ovatus Roth Tent. Fl. Germ. 2: 562. 1793
Synonyms: Eleocharis obtusa var. ovata (Roth) Drepalik & Mohlenbrock Eleocharis ovata var. heuseri Uetrichtz
Treatment appears in FNA Volume 23. Treatment on page 103. Mentioned on page 64, 97, 101, 104, 105.

Culms 2–35 cm × 0.3–1 mm. Leaves: apex of distal leaf-sheath obtuse to acute, tooth to 0.2 mm. Spikelets ovoid, 2–8 × 2–4 mm, apex acute (to blunt); floral scales 25–100+, ca. 10 per mm of rachilla, orangebrown, rarely stramineous, ovate, 1.5–2 × 1 mm, midribs often keeled in distal part of spikelet, apex rounded to subacute. 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. Achenes 0.75–1 × 0.6–0.85 mm. 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. 2n = 10.


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)

Distribution

V23 155-distribution-map.jpg

Alta., B.C., N.B., Nfld. and Labr., N.S., Ont., P.E.I., Que., Ariz., Conn., Ill., Ind., Iowa, Ky., Maine, Mass., Mich., Minn., Mo., N.H., N.J., N.Y., Ohio, Okla., Oreg., Pa., Vt., Va., Wash., W.Va., Wis., Eurasia

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.

Selected References

None.

Lower Taxa

None.

... more about "Eleocharis ovata"
dark-brown +  and stramineous +
0.075 cm0.75 mm <br />7.5e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
biconvex +
wide;0.6mm;0.85mm +
0.3 cm3 mm <br />0.003 m <br /> (?) +
not constricted +
S. Galen Smith* +, Jeremy J. Bruhl* +, M. Socorro González-Elizondo* +  and Francis J. Menapace* +
(Roth) Roemer & Schultes in J. J. Roemer et al. +
flattened +
0 cm0 mm <br />0 m <br /> (6 cm60 mm <br />0.06 m <br />) +
shortened +
persistent +
enlarged +
Scirpus ovatus +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
Ovate spike-rush +  and éléocharide ovale +
2 cm20 mm <br />0.02 m <br /> (35 cm350 mm <br />0.35 m <br />) +
0.3mm;1mm +
green +  and stramineous +
Alta. +, B.C. +, N.B. +, Nfld. and Labr. +, N.S. +, Ont. +, P.E.I. +, Que. +, Ariz. +, Conn. +, Ill. +, Ind. +, Iowa +, Ky. +, Maine +, Mass. +, Mich. +, Minn. +, Mo. +, N.H. +, N.J. +, N.Y. +, Ohio +, Okla. +, Oreg. +, Pa. +, Vt. +, Va. +, Wash. +, W.Va. +, Wis. +  and Eurasia +
10–700 m (East), 1500–2000 m (Arizona) +
stramineous +  and orangebrown +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
1 cm10 mm <br />0.01 m <br /> (?) +
hypogynous +  and subtending +
biconvex +  and trigonous +
Fresh, often drying shores, lake and stream beds, bogs, tidal estuaries, disturbed places +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
flattened +
0 cm0 mm <br />0 m <br /> (6 cm60 mm <br />0.06 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
Fruiting summer–fall. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
stramineous;medium brown or red brown or blackish brown +
in J. J. Roemer et al., Syst. Veg. +
ascending +  and horizontal +
caudex-like +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
adventitious +
basal +  and proximal +
2-keeled +
cylindric +
Illustrated +
0.2 cm2 mm <br />0.002 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
3-fid +, some +  and 2-fid +
Eleocharis obtusa var. ovata +  and Eleocharis ovata var. heuseri +
Eleocharis ovata +
Eleocharis (sect. Eleogenus) ser. Ovatae +
species +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
0.3mm;0.5mm +
0.3mm +  and 0.5mm +