Eleocharis occulta

S. G. Smith

Novon 11: 247, figs. 2, 3E–K. 2001.

Treatment appears in FNA Volume 23. Treatment on page 83. Mentioned on page 67, 84, 86.

Plants perennial, densely cespitose; rhizomes concealed by persistent dead culm bases, often ascending, short, 3–5 mm thick, hard, cortex persistent, internodes very short, scales decaying to coarse fibers, 5–12 mm, papery. Culms subterete to slightly compressed, less than 2 times wider than thick, with 4–7 blunt ridges when dry, 27–56 cm × 0.2–0.5 (–0.7) mm, firm to hard, spongy. Leaves: distal leaf-sheaths persistent, not splitting, proximally red, distally green to stramineous, often inflated, thinly papery to membranous, sometimes translucent, apex broadly obtuse to subtruncate, often callose, tooth absent. Spikelets ovoid, 3–10 × 2–3 mm, apex acute; proximal scale amplexicaulous, apex 2-fid; subproximal scale with a flower; floral scales spreading in fruit, 20–50, 7 per mm of rachilla, medium brown, midrib region often narrowly stramineous, carinate, lanceolate-attenuate, 2–2.8 × 1 mm, apex 2-fid. Flowers: perianth bristles 3 or absent, stramineous to pale-brown, rudimentary to 1/2 achene length, obscurely retrorsely spinulose; stamens 3; anthers orangebrown, 0.7–1.3 mm; styles 3-fid. Achenes falling with scales, medium or dark-brown, obpyriform, nearly equilaterally obscurely trigonous or cross-section nearly circular, 0.7–1 × 0.5–0.65 mm, neck distinct or rarely absent, obscurely rugulose at 10–30X, 30 or more low, blunt horizontal ridges in vertical series. Tubercles brown, depressed-pyramidal, often rudimentary, 0.1–0.15 × 0.2 mm.


Phenology: Fruiting spring (Mar–May), sometimes summer (Jul).
Habitat: Seasonally wet, calcareous seeps, depressions, swales, rock crevises, rocky stream beds, stream banks, wet meadows, pond margins, often on limestone
Elevation: 80–300 m

Discussion

Eleocharis occulta is very invariable in contrast to the extreme variability of E. compressa.

Selected References

None.

Lower Taxa

None.

"spinulose" is not a number.

... more about "Eleocharis occulta"
cancellate or reticulate +  and rugulose +
trigonous;obpyriform +
color +  and texture +
orangebrown +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
S. Galen Smith* +, Jeremy J. Bruhl* +, M. Socorro González-Elizondo* +  and Francis J. Menapace* +
S. G. Smith +
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 +
persistent +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.5mm +  and 0.65mm +
0 cm0 mm <br />0 m <br /> (100 cm1,000 mm <br />1 m <br />) +
subterete +  and slightly compressed +
0.3mm;5mm +
0-2 times wider than thick +
distally green +  and stramineous +
Okla. +  and Tex. +
80–300 m +
membranous +  and thinly papery +
hypogynous +  and subtending +
biconvex +  and trigonous +
Seasonally wet, calcareous seeps, depressions, swales, rock crevises, rocky stream beds, stream banks, wet meadows, pond margins, often on limestone +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
0.2 cm2 mm <br />0.002 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
lanceolate-attenuate +  and carinate +
1 cm10 mm <br />0.01 m <br /> (?) +
flattened +
0 cm0 mm <br />0 m <br /> (6 cm60 mm <br />0.06 m <br />) +
distinct +
rugulose +
with (1-)3-6(-30) bristles and/or scales +
Fruiting spring (Mar–May), sometimes summer (Jul). +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
stramineous;medium brown or red brown or blackish brown +
caudex-like +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
27cm;56cm +
spongy;firm;hard +
0.2mm;0.5mm +
adventitious +
basal +  and proximal +
2-keeled +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
cylindric +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
Eleocharis +
Eleocharis occulta +
Eleocharis (sect. Eleocharis) ser. Eleocharis +
species +
0.1mm;0.15mm +
depressed-pyramidal +
plant +  and cespitose +