Eleocharis bicolor

Chapman

Fl. South. U.S., 517. 1860.

IllustratedConservation concern
Treatment appears in FNA Volume 23. Treatment on page 96. Mentioned on page 63, 94, 98.

Plants probably perennial, tufted, not stoloniferous; rhizomes present, ± horizontal, 0.2–0.4 mm thick, firm, longer internodes 3–7 mm, scales translucent or not. Culms often ascending, often spotted or streaked-redbrown, cross-section quadrangular or broadly elliptic, often sulcate, 1.5–8 (–25) cm × 0.1–0.3 mm, soft. Leaves: distal leaf-sheaths persistent or fugaceous, closely sheathing, not conspicuously wrinkled, colorless or pale-brown, sometimes spotted redbrown, delicately membranous, apex narrowly acute. Spikelets: basal spikelets absent; never proliferous, ovoid or ellipsoid, laterally compressed or terete, 1.5–3.7 × 0.8–3 mm, apex acute; proximal scale empty, persistent, amplexicaulous, similar to floral scales; subproximal scale with a flower; floral scales distichous (spirodistichous), 8–22, 6–10 per mm of rachilla, colorless or pale-brown, mottled-redbrown to purple, ovate, (1–) 2 × 1 mm, membranous, midribs green and redbrown, prominent, apex rounded to obtuse. Flowers: perianth bristles present or absent, (1–) 4, colorless to white, vestigial to shorter than achene, 0–0.55 mm; spinules not evident at 45X; stamens (1–) 3; anthers 0.35–0.45 mm; styles 2-fid (or 3-fid). Achenes whitish to pale-brown, obovoid, biconvex, rarely trigonous, angles prominent, 0.5–0.8 × 0.4–0.6 mm, apex slightly constricted proximal to tubercle, smooth. Tubercles sessile, green or redbrown, pyramidal, birettaform or umbonate, 0.15–0.25 × 0.3–0.4 mm.


Phenology: Fruiting summer–late fall.
Habitat: Moist banks, freshwater, damp pine barrens
Elevation: 0–50 m

Distribution

V23 139-distribution-map.jpg

Fla., Ga., Miss., West Indies, Central America (Nicaragua)

Discussion

Of conservation concern.

The culms of Eleocharis bicolor sometimes have complete transverse septa which are prominent when plants are aquatic.

Selected References

None.

Lower Taxa

None.

"shortened" is not a number.

... more about "Eleocharis bicolor"
with longitudinal rows +, smooth +  and honeycomb-reticulate +
whitish +  and pale-brown +
smooth +  and markedly sculptured +
trigonous;biconvex;obovoid +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
0.4mm;0.6mm +
0.035 cm0.35 mm <br />3.5e-4 m <br /> (0.045 cm0.45 mm <br />4.5e-4 m <br />) +
rounded;obtuse +
constricted +
Jeremy J. Bruhl +  and S. Galen Smith +
Chapman +
flattened +
0 cm0 mm <br />0 m <br /> (6 cm60 mm <br />0.06 m <br />) +
persistent +
enlarged +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
8 cm80 mm <br />0.08 m <br /> (25 cm250 mm <br />0.25 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (8 cm80 mm <br />0.08 m <br />) +
elliptic +  and quadrangular +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (?) +  and 0.03 cm0.3 mm <br />3.0e-4 m <br /> (?) +
streaked-redbrown +  and spotted +
0 cm0 mm <br />0 m <br /> (100 cm1,000 mm <br />1 m <br />) +
compressed +
0.1mm;0.75mm +
spotted redbrown +, pale-brown +  and colorless +
fugaceous +  and persistent +
Fla. +, Ga. +, Miss. +, West Indies +  and Central America (Nicaragua) +
0–50 m +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
pale-brown mottled-redbrown +  and purple +
2 cm20 mm <br />0.02 m <br /> (?) +
1 cm10 mm <br />0.01 m <br /> (?) +
hypogynous +  and subtending +
biconvex +  and trigonous +
Moist banks, freshwater, damp pine barrens +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
green and redbrown +
flattened +
0 cm0 mm <br />0 m <br /> (6 cm60 mm <br />0.06 m <br />) +
0 cm0 mm <br />0 m <br /> (0.055 cm0.55 mm <br />5.5e-4 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
Fruiting summer–late fall. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
amplexicaulous +  and empty +
stramineous;medium brown or red brown or blackish brown +
Fl. South. U.S., +
caudex-like +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
adventitious +
not +  and translucent +
basal +  and proximal +
2-keeled +
cylindric +
Illustrated +  and Conservation concern +
stoloniferous +
proliferating +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.37 cm3.7 mm <br />0.0037 m <br />) +
terete;compressed;ellipsoid;ovoid;terete;compressed;ellipsoid;ovoid +
0.8mm;3mm +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
Eleocharis +
Eleocharis bicolor +
Eleocharis (sect. Eleocharis) ser. Tenuissimae +
species +
redbrown;green +
0.15mm;0.25mm +
umbonate +, birettaform +  and pyramidal +
0.3mm +  and 0.4mm +