Eleocharis elongata

Chapman

Fl. South. U.S., 515. 1860.

Illustrated
Treatment appears in FNA Volume 23. Treatment on page 117. Mentioned on page 62, 112, 116.

Plants perennial; rhizomes 1–1.5 mm thick, soft, longer internodes 2–3 cm, scales 5–14 mm, tubers absent. Culms obscurely trigonous to terete; spikelet-bearing culms 16–80 cm × 0.5–1.5 mm; when submersed plants often forming numerous, filiform flaccid culms without spikelets, sometimes with whorls of slender branches, 0.1–0.3 mm wide, soft; sometimes septate-nodulose when aquatic, internally spongy, transverse septa incomplete. Leaves: distal leaf-sheaths persistent or decaying, membranous, apex acute, often prolonged into translucent portion to 1 mm. Spikelets not proliferous, (6–) 9–24 × 1.4–2.2 mm; rachilla joints bearing prominent winglike remnants of floral scales; proximal scale with a flower, amplexicaulous, 2.5–4.1 mm; floral scales 7–26, 1–2 per mm of rachilla, green to stramineous or pale-brown, often minutely dotted reddish, usually with conspicuous dark-brown to blackish submarginal band, narrowly ovate, 3.5–4.5 × 2 mm, thickly papery, membranous toward margins. Flowers: perianth bristles 6–7, whitish to stramineous or pale reddish-brown, proximally slightly flattened, unequal, exceeding or rarely shorter than achene, 0.7–1.9 mm, retrorsely spinulose; anthers yellow to reddish, 1.7–1.9 mm; styles 3-fid. Achenes whitish, stramineous, or pale green, obovoid to obpyriform, compressed trigonous with adaxial face broadest, or biconvex, 0.65–1.4 × 0.5–0.8 mm, clearly sculptured at 10–15X, each face with 10–13 rows of rectangular, transversely elongated cells, apex constricted to short neck 0.2–0.25 (–0.3) mm wide, wider at tubercle base. Tubercles dark-brown, pyramidal, 0.2–0.5 × 0.2–0.4 mm.


Phenology: Fruiting late spring–late fall.
Habitat: Sometimes drying ponds, lakeshores, marshes, creeks, canals, ditches
Elevation: 10–50 m

Distribution

V23 177-distribution-map.jpg

Ala., Fla., N.C., Tex., Mexico, Central America, South America

Discussion

Eleocharis elongata sometimes grows with E. robbinsii; no intermediates are known.

Selected References

None.

Lower Taxa

None.

"shortened" is not a number."wider" is not a number.

... more about "Eleocharis elongata"
pale green +, stramineous +  and whitish +
0.065 cm0.65 mm <br />6.5e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
sculptured +
biconvex;trigonous;compressed;obovoid;obpyriform +
constricted +
0.5mm;0.8mm +
yellow;reddish +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.19 cm1.9 mm <br />0.0019 m <br />) +
prolonged +
constricted +  and short +
M. Socorro González-Elizondo +
Chapman +
flattened +
0 cm0 mm <br />0 m <br /> (6 cm60 mm <br />0.06 m <br />) +
persistent +
enlarged +
Undefined subg. Limnochloa +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
rectangular +
enlarged +
16 cm160 mm <br />0.16 m <br /> (80 cm800 mm <br />0.8 m <br />) +
septate-nodulose +, filiform +, obscurely trigonous +  and terete +
spongy;flaccid +
0.5mm;1.5mm +
decaying +  and persistent +
Ala. +, Fla. +, N.C. +, Tex. +, Mexico +, Central America +  and South America +
10–50 m +
dotted reddish +, green +  and stramineous or pale-brown +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
membranous +  and papery +
2 cm20 mm <br />0.02 m <br /> (?) +
subtending +
biconvex +  and trigonous +
Sometimes drying ponds, lakeshores, marshes, creeks, canals, ditches +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
flattened +
0 cm0 mm <br />0 m <br /> (6 cm60 mm <br />0.06 m <br />) +
distinct +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (?) +  and 0.025 cm0.25 mm <br />2.5e-4 m <br /> (?) +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.19 cm1.9 mm <br />0.0019 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
Fruiting late spring–late fall. +
2-3(-4)-carpellate +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
3 (?) +  and 1 (?) +
stramineous;medium brown or red brown or blackish brown +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.41 cm4.1 mm <br />0.0041 m <br />) +
Fl. South. U.S., +
ascending +  and horizontal +
caudex-like +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
adventitious +
basal +  and proximal +
2-keeled +
0.5 cm5 mm <br />0.005 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
cylindric +
Illustrated +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
0.9 cm9 mm <br />0.009 m <br /> (2.4 cm24 mm <br />0.024 m <br />) +
not proliferous +
terete;cylindric;narrowly ellipsoid +
0.9 cm9 mm <br />0.009 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
1.4mm;2.2mm +
1 +  and 3 +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
dark-brown +  and blackish +
Eleocharis (sect. Undefined) ser. Mutatae +
Eleocharis elongata +
Eleocharis subg. Limnochloa +
species +
0.2mm;0.5mm +
pyramidal +
0.2mm +  and 0.4mm +
stoloniferous +  and rhizomatous +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +