Eleocharis (sect. Eleocharis) ser. Melanocarpae

Svenson

Rhodora 31: 129. 1929.

Treatment appears in FNA Volume 23.

Plants perennial, often stoloniferous, with some culms often arching or decumbent and with tips rooting. Rhizomes caudexlike, ascending, concealed by crowded culms, short, (2–) 3–4 mm thick, internodes crowded. Culms compressed, 0.5–1.3 mm wide. Leaves: distal leaf-sheaths persistent, thickly papery, apex subtruncate, tooth always present, to 2 mm. Spikelets terete, basal spikelets absent. Floral scales papery or membranous; styles 3-fid. Achenes dark-brown to often black, seldom yellowbrown, usually widest at apex, trigonous, smooth at 30X. Tubercles distinct from achene apex in color, texture, and form.

Distribution

United States

Discussion

Species 1.

Selected References

None.

yellowbrown +, black +  and dark-brown to often +
smooth +  and markedly sculptured +
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* +
Svenson +
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 +
0 cm0 mm <br />0 m <br /> (100 cm1,000 mm <br />1 m <br />) +
compressed +
0.5mm;1.3mm +
United States +
membranous +  and papery +
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 +
caudex-like +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 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 +
Eleocharis +
Eleocharis (sect. Eleocharis) ser. Melanocarpae +
Eleocharis sect. Eleocharis +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
rooting +  and stoloniferous +