Eleocharis aestuum

Hines ex A. Haines

Novon 11: 45. 2001.

Treatment appears in FNA Volume 23. Treatment on page 104. Mentioned on page 64, 101, 103, 105.

Culms often spreading or declining, 3–30 cm × 0.5–1 mm. Leaves: apex of distal leaf-sheath obtuse, tooth to 0.2 (–0.5) mm. Spikelets ellipsoid to ovoid, 3–10 × 2–4 mm, apex blunt to subacute; floral scales 10–100+, 10 per mm of rachilla, colorless to pale brownish except for green midrib, 1.5–2 × 1 mm, midribs not keeled, apex rounded. Flowers: perianth bristles absent or 2–4, stramineous or whitish, shorter than to nearly 1/2 achene, very slender, without spinules; stamens 2 (–3); anthers 0.3–0.5 mm; styles 2-fid or some 3-fid. Achenes 0.75–1 × 0.6–0.8 mm. Tubercles deltoid, 0.2–0.3 × 0.35–0.45 (–0.55) mm, 1/2–3/4as high as wide, 1/4–1/3 as high and 1/2–2/3 (–4/5) as wide as achene.


Phenology: Fruiting summer–fall (Jul–Oct).
Habitat: Fresh tidal river shores
Elevation: 0–10 m

Distribution

V23 156-distribution-map.jpg

Conn., Del., Maine, Mass., N.J., N.Y., Pa.

Discussion

Eleocharis aestuum is very similar to E. diandra and E. ovata; E. diandra differs from E. aestuum in its lower tubercles, brown floral scales, and absence of perianth bristles; E. ovata differs as given in the key to species. D. M. Hines (1975) described E. aestuum using the epithet “palidostachys” [ined.]. Specimens from shores of the Lake-of-the-Woods in Minnesota, and a reservoir and farm in Hardin and Fayette counties, Tennessee, may be referable to E. aestuum. The only recent records of E. aestuum are from the Androscoggin and Kennebec rivers in Maine and the Hudson River in New York (A. Haines 2001).

Selected References

None.

Lower Taxa

None.

... more about "Eleocharis aestuum"
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 +
0.6mm;0.8mm +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
not constricted +
S. Galen Smith* +, Jeremy J. Bruhl* +, M. Socorro González-Elizondo* +  and Francis J. Menapace* +
Hines ex A. Haines +
flattened +
0 cm0 mm <br />0 m <br /> (6 cm60 mm <br />0.06 m <br />) +
shortened +
persistent +
enlarged +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
3 cm30 mm <br />0.03 m <br /> (30 cm300 mm <br />0.3 m <br />) +
declining +  and spreading +
0.5mm;1mm +
green +  and stramineous +
Conn. +, Del. +, Maine +, Mass. +, N.J. +, N.Y. +  and Pa. +
0–10 m +
colorless +  and pale brownish +
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 tidal river shores +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
not keeled +
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 (Jul–Oct). +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
stramineous;medium brown or red brown or blackish brown +
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 +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
ellipsoid;ovoid +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
3-fid +, some +  and 2-fid +
Eleocharis +
Eleocharis aestuum +
Eleocharis (sect. Eleogenus) ser. Ovatae +
species +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
0.045 cm0.45 mm <br />4.5e-4 m <br /> (0.055 cm0.55 mm <br />5.5e-4 m <br />) +
0.2mm;0.3mm +
1/2 +  and 2/3-4/5 +
0.35mm +  and 0.45mm +