Eleocharis rostellata

(Torrey) Torrey

Fl. New York 2: 347. 1843.

Common names: Beaked spike-rush walking sedge
Illustrated
Basionym: Scirpus rostellatus Torrey Ann. Lyceum Nat. Hist. New York 3: 318. 1836
Treatment appears in FNA Volume 23. Treatment on page 90. Mentioned on page 62, 67, 91.

Plants densely tufted, mat-forming by means of rooting culm tips. Culms 1.5–3 times as wide as thick, 20–100 cm × 0.35–2 mm, firm to hard, wiry, with to 8 subacute ribs, rarely nearly smooth; some culms arching or decumbent and rooting at tips. Leaves: distal leaf-sheaths not splitting abaxially, proximally dark red to brown, apex usually reddish. Spikelets ovoid, 5–17 × 2.5–5 mm, apex acute; spikelets on stolons rudimentary, nonflowering, proliferous when rooting; proximal scale empty, amplexicaulous, ovate, 2–4 mm; subproximal scale with flower; floral scales 20–40, 2–3 per mm of rachilla, stramineous to medium brown, midrib region paler, ovate, 3.5–6 × 2–3 mm, membranous to cartilaginous, apex entire, rounded to subacute. Flowers: perianth bristles brown, equaling achene or tubercle, densely spinulose; anthers brown, 2–2.4 mm. Achenes often very variable within one plant, ovoid to obovoid or obpyriform, 1.5–2.5 × 1–1.2 mm, beak to 1 × 0.6 mm. Tubercles when present pale to dark-brown, pyramidal, to 0.5 × 0.3 mm.


Phenology: Fruiting late spring in south, summer–fall in north.
Habitat: Very wet calcareous or brackish fens, springs, shores
Elevation: 50–2400 m

Distribution

V23 127-distribution-map.jpg

B.C., N.S., Ont., Ariz., Calif., Conn., Del., Fla., Idaho, Ill., Ind., Kans., La., Maine, Md., Mass., Mich., Minn., Mont., Nebr., Nev., N.J., N.Mex., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., S.Dak., Tex., Utah, Va., Wash., Wis., Wyo., Mexico, West Indies (Cuba), West Indies (Haiti), West Indies (Puerto Rico)

Discussion

Eleocharis rostellata is highly competitive, often forming large monospecific colonies. The South American E. platypus C. B. Clarke is often treated as a synonym of E. rostellata. Eleocharis rostellata superfically closely resembles E. suksdorfiana in its culms, spikelets, and achenes, but differs in the absence of creeping rhizomes, presence of stoloniferous culms, absence of a flower in the proximal scale, and achene surface details. The collection of E. rostellata I have seen from Miami-Dade County, Florida, is from 1877. I have not seen vouchers for Archuleta County, Colorado, by H. D. Harrington (1954), or for the localities in Montana and South Carolina, which are based on the map in H. K. Svenson (1934).

Selected References

None.

Lower Taxa

None.
... more about "Eleocharis rostellata"
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
smooth +  and markedly sculptured +
ovoid;obovoid or obpyriform +
1mm;1.2mm +
0.2 cm2 mm <br />0.002 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
S. Galen Smith* +, Jeremy J. Bruhl* +, M. Socorro González-Elizondo* +  and Francis J. Menapace* +
(Torrey) Torrey +
flattened +
0 cm0 mm <br />0 m <br /> (6 cm60 mm <br />0.06 m <br />) +
shortened +
persistent +
enlarged +
Scirpus rostellatus +
reticulate +  and smooth +
distinct +
0mm;1mm +
rugulose +
narrowed +, planoconvex +  and trigonous or biconvex +
0mm;0.6mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
Beaked spike-rush +  and walking sedge +
rooting +  and wiry +
20 cm200 mm <br />0.2 m <br /> (100 cm1,000 mm <br />1 m <br />) +
decumbent +  and arching +
compressed +
firm;hard +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.35mm;2mm +
1.5-3 times as wide as thick +
proximally dark red +  and brown +
B.C. +, N.S. +, Ont. +, Ariz. +, Calif. +, Conn. +, Del. +, Fla. +, Idaho +, Ill. +, Ind. +, Kans. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mont. +, Nebr. +, Nev. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, R.I. +, S.C. +, S.Dak. +, Tex. +, Utah +, Va. +, Wash. +, Wis. +, Wyo. +, Mexico +, West Indies (Cuba) +, West Indies (Haiti) +  and West Indies (Puerto Rico) +
50–2400 m +
stramineous +  and medium brown +
membranous +  and cartilaginous +
hypogynous +  and subtending +
biconvex +  and trigonous +
Very wet calcareous or brackish fens, springs, shores +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
membranous +  and cartilaginous +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 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 in south, summer–fall in north. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
amplexicaulous +  and empty +
stramineous;medium brown or red brown or blackish brown +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Fl. New York +
horizontal +  and ascending +
caudex-like +
3 cm30 mm <br />0.03 m <br /> (?) +
subacute +
adventitious +
basal +  and proximal +
2-keeled +
cylindric +
W1 +  and Illustrated +
0.5 cm5 mm <br />0.005 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
2.5mm;5mm +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
rudimentary +
2-fid +  and 3-fid +
Eleocharis +
Eleocharis rostellata +
Eleocharis (sect. Eleocharis) ser. Rostellatae +
species +
pyramidal +
0mm +  and 0.3mm +
rooting +  and stoloniferous +
plant +  and mat-forming +