Eleocharis (sect. Eleocharis) ser. Rostellatae

S. González & P. M. Peterson

Taxon 46: 440. 1997.

Treatment appears in FNA Volume 23.

Plants perennial, stoloniferous, with some culms arching or decumbent and rooting at tips. Rhizomes caudexlike, concealed by crowded culms, ascending or partly horizontal, very short, 3 mm thick, internodes crowded. Culms compressed, 0.3–2 mm thick. Leaves: distal leaf-sheaths persistent, papery, apex obtuse to subacute, tooth absent. Spikelets terete, basal spikelets absent; floral scales spiraled, membranous to cartilaginous; styles 3-fid, or 3-fid and 2-fid. Achenes medium to dark-brown, beak paler, planoconvex to trigonous or biconvex, usually distally narrowed into a distinct beak, rugulose at 10X or smooth or finely reticulate at 10–30X. Tubercles usually obscure or absent, often merging with achene apex in color, texture, and form.

Distribution

North America, Mexico, West Indies, South America

Discussion

Species 2 (1 in the flora).

Selected References

None.

smooth +  and markedly sculptured +
biconvex;trigonous +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
S. Galen Smith* +, Jeremy J. Bruhl* +, M. Socorro González-Elizondo* +  and Francis J. Menapace* +
S. González & P. M. Peterson +
flattened +
0 cm0 mm <br />0 m <br /> (6 cm60 mm <br />0.06 m <br />) +
shortened +
persistent +
enlarged +
reticulate +  and smooth +
distinct +
rugulose +
narrowed +, planoconvex +  and trigonous or biconvex +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
0 cm0 mm <br />0 m <br /> (100 cm1,000 mm <br />1 m <br />) +
decumbent +  and arching +
compressed +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
North America +, Mexico +, West Indies +  and South America +
membranous +  and cartilaginous +
hypogynous +  and subtending +
biconvex +  and trigonous +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
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 +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
stramineous;medium brown or red brown or blackish brown +
horizontal +  and ascending +
caudex-like +
3 cm30 mm <br />0.03 m <br /> (?) +
adventitious +
basal +  and proximal +
2-keeled +
cylindric +
0 cm0 mm <br />0 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
2-fid +  and 3-fid +
Eleocharis +
Eleocharis (sect. Eleocharis) ser. Rostellatae +
Eleocharis sect. Eleocharis +
rooting +  and stoloniferous +