Eleocharis reverchonii

Svenson

Rhodora 31: 203, fig. 27. 1929.

IllustratedEndemicConservation concern
Treatment appears in FNA Volume 23. Treatment on page 110. Mentioned on page 108, 109.

Plants perennial; rhizomes sometimes not evident, 0.3–0.5 mm thick, internodes 3–11 mm, scales not evident. Culms sometimes arched, smooth or obscurely 4-angled or 5-angled or ridged, terete or slightly compressed, 6–25 cm × 0.15–0.3 mm, soft to firm. Leaves: distal leaf-sheaths persistent, red proximally, colorless distally, closely sheathing, apex blunt. Spikelets ovoid, 2–6 × 1–2 mm, apex acute; scales 5–15, 5 per mm of rachilla, bright redbrown, midrib region green to stramineous, ovate, 1.5–1.7 × 1 mm, midrib keeled to obscure, apex blunt to acute. Flowers: perianth bristles absent; anthers 0.5–1 × 0.2 mm. Achenes with angles plus longitudinal ridges ca. 8–9, obscure to rather prominent, obovoid to obpyriform, much less than 2 times longer than wide, 0.55–0.6 × 0.3–0.4 mm, trabeculae 20–30, rather obscure and crowded. Tubercles brownish to whitish, pyramidal to depressed, 0.1–0.15 × 0.1–0.2 mm.


Phenology: Fruiting late winter–spring (Feb–Apr).
Habitat: Wet soil of ponds, marshes, grasslands, ditches
Elevation: 10–200 m

Discussion

Of conservation concern.

Eleocharis reverchonii perhaps should be treated as a variety or subspecies of E. acicularis. One collection (three sheets at KSC) from Calhoun county in southeastern Texas is apparently the only known example within E. subg. Scirpidium with proliferous spikelets.

Selected References

None.

Lower Taxa

None.
... more about "Eleocharis reverchonii"
trigonous;nearly terete +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (?) +
S. Galen Smith* +, Jeremy J. Bruhl* +, M. Socorro González-Elizondo* +  and Francis J. Menapace* +
Svenson +
flattened +
0 cm0 mm <br />0 m <br /> (6 cm60 mm <br />0.06 m <br />) +
shortened +
persistent +
enlarged +
Undefined subg. Scirpidium +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
obscurely 4-angled or 5-angled or ridged terete or slightly compressed +  and smooth +
6 cm60 mm <br />0.06 m <br /> (25 cm250 mm <br />0.25 m <br />) +
compressed +, terete +, ridged +, 5-angled +  and 4-angled +
soft;firm +
0.15mm;0.3mm +
colorless +  and red +
10–200 m +
0.1 cm1 mm <br />0.001 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
subtending +
biconvex +  and trigonous +
Wet soil of ponds, marshes, grasslands, ditches +
0.3 cm3 mm <br />0.003 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.17 cm1.7 mm <br />0.0017 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 winter–spring (Feb–Apr). +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
stramineous;medium brown or red brown or blackish brown +
ascending +  and horizontal +
caudex-like +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0.55mm;0.6mm +
prominent +  and obscure to rather +
obovoid +  and obpyriform +
0.3mm;0.4mm +
adventitious +
bright redbrown +
basal +  and proximal +
not evident +
2-keeled +
cylindric +
Illustrated +, Endemic +  and Conservation concern +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
proliferating +
0.2 cm2 mm <br />0.002 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
Eleocharis (sect. Undefined) ser. Aciculares +
Eleocharis reverchonii +
Eleocharis subg. Scirpidium +
species +
brownish;whitish +
0.1mm;0.15mm +
pyramidal +  and depressed +
0.1mm +  and 0.2mm +
0 +  and 10 +
stoloniferous +  and rhizomatous +