Eleocharis tricostata

Torrey

Ann. Lyceum Nat. Hist. New York. 3: 310. 1836.

IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 88. Mentioned on page 66, 80, 87.

Plants perennial, mat-forming; rhizomes evident, fairly long, 1.5–3 mm thick, hard, cortex persistent, longer internodes 1.5–3 mm, scales disintegrating to fibers, 4–5 mm, papery. Culms terete, often with 8–12 blunt ridges when dry, 20–55 cm × 0.3–1.3 mm, soft to hard. Leaves: distal leaf-sheaths persistent, rarely splitting, proximally red to stramineous, distally green to reddish, papery, apex often dark reddish, subtruncate to obtuse, not callose, tooth present on some or all culms of plant, to 0.5 mm. Spikelets cylindric to ovoid, 5–20 × 2–3 mm, apex rounded to subacute; proximal scale amplexicaulous, apex entire; subproximal scale empty; floral scales appressed in fruit, 20–200+, 10 per mm of rachilla, dark-brown, midrib regions often stramineous or greenish, oblong, 1.7–2.5 × 1 mm, apex entire, broadly rounded, usually recurved, mostly carinate. Flowers: perianth bristles absent; stamens 3; anthers dark yellow, 1–1.5 mm; styles 3-fid. Achenes falling with scales, medium to dark-brown, obovoid to obpyriform, with short neck, thickly trigonous, angles prominent (keeled), 0.7–0.9 × 0.4–0.6 mm, obscurely to clearly rugulose at 10–20X with more than 20 horizontal ridges in vertical series and/or minutely cancellate at 20–30X. Tubercles brown, rudimentary, mostly apiculate, sometimes pyramidal, 0.05–0.15 × 0.15–0.2 mm.


Phenology: Fruiting late spring–summer.
Habitat: Wet sandy or peaty depressions, pond margins, pine barrens, savannas, mostly coastal plains
Elevation: 10–200 m

Distribution

V23 123-distribution-map.jpg

Ala., Fla., Ga., Mass., Mich., N.J., N.Y., N.C., S.C., Va.

Discussion

I have not seen specimens to verify reports of Eleocharis tricostata from Louisiana. In the absence of rhizomes and achenes, E. tricostata is easily mistaken for E. montevidensis.

Selected References

None.

Lower Taxa

None.
... more about "Eleocharis tricostata"
cancellate or reticulate +  and rugulose +
trigonous;obovoid;obpyriform +
color +  and texture +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
rugulose +
0.4mm;0.6mm +
dark yellow +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
dark reddish +
not callose +
S. Galen Smith* +, Jeremy J. Bruhl* +, M. Socorro González-Elizondo* +  and Francis J. Menapace* +
Torrey +
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 cm0 mm <br />0 m <br /> (100 cm1,000 mm <br />1 m <br />) +
0.3mm;5mm +
proximally red +  and stramineous distally green +
Ala. +, Fla. +, Ga. +, Mass. +, Mich. +, N.J. +, N.Y. +, N.C. +, S.C. +  and Va. +
10–200 m +
membranous +  and thinly papery +
hypogynous +  and subtending +
biconvex +  and trigonous +
Wet sandy or peaty depressions, pond margins, pine barrens, savannas, mostly coastal plains +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
1 cm10 mm <br />0.01 m <br /> (?) +
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 late spring–summer. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
stramineous;medium brown or red brown or blackish brown +
Ann. Lyceum Nat. Hist. New York. +
ascending +  and horizontal +
caudex-like +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
20cm;55cm +
soft;hard +
0.3mm;1.3mm +
adventitious +
disintegrating +
basal +  and proximal +
2-keeled +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
cylindric +
Illustrated +  and Endemic +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
cylindric;ovoid +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
Eleocharis +
Eleocharis tricostata +
Eleocharis (sect. Eleocharis) ser. Eleocharis +
species +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0.05mm;0.15mm +
pyramidal +
0.15mm +  and 0.2mm +
plant +  and mat-forming +