Eleocharis compressa Sullivant (Q3286)

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Eleocharis compressa is a taxon with the rank species within the series Eleocharis ser. Eleocharis
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English
Eleocharis compressa Sullivant
Eleocharis compressa is a taxon with the rank species within the series Eleocharis ser. Eleocharis

    Statements

    taxon/id/Eleocharis compressa Sullivant
    0 references
    Eleocharis compressa Sullivant
    Eleocharis compressa
    Sullivant
    FNA Editorial Committee. 2002. Flora of North America north of Mexico. Volume 23: Cyperaceae. Oxford University Press, New York.
    accepted
    flat-stemmed spikerush (English)
    compressed spikerush (English)
    éléocharide comprimée (French)
    Plants perennial, mat-forming;
    rhizomes evident, short to rather long, 2–3 mm thick, firm, cortex persistent, internodes very short to 2 mm, scales often decaying to coarse fibers, 5–12 mm, papery.
    Culms subterete to greatly compressed, to 5 times as wide as thick, often with 2–12 ridges, 8–45 cm × (0.2–) 0.5–1.8 mm, firm to hard, spongy.
    Leaves: distal leaf-sheaths persistent, not splitting, proximally red, distally green to stramineous, papery, apex usually redbrown, broadly obtuse to subtruncate, callose, tooth absent.
    Spikelets ovoid, 4–8 × 2–4 mm, apex acute;
    proximal scale clasping 3/4 of culm to amplexicaulous, entire;
    subproximal scale empty or with flower;
    floral scales spreading in fruit, 20–60, 6 per mm of rachilla, medium brown to very dark-brown, sometimes stramineous or colorless, midrib region often paler, ovate, 2–3 (–4) × 1–1.5 mm, apex acute to acuminate, the apical colorless hyaline region mostly longer than wide and 0.6–1.2 mm, in proximal part of spikelet 2-fid to shallowly cut, rarely entire, in distal part often entire, carinate in distal part of spikelet.
    Flowers: perianth bristles 0–5, stramineous, length variable, to equaling achene, obscurely to clearly retrorsely spinulose;
    anthers yellow to orangebrown, 0.7–2 mm;
    styles 3-fid or some 2-fid.
    Achenes falling with scales or some persistent, yellowbrown or dark-brown, obovoid to obpyriform, nearly equilaterally to compressedtrigonous or usually some biconvex, angles evident or obscure, 0.8–1.1 × 0.6–0.8 mm, neck very short, finely rugulose and sometimes finely (or coarsely) cancellate at 10–20X with 14–20 blunt horizontal ridges in a vertical series.
    Tubercles brown (to whitish), pyramidal, usually depressed, often rudimentary, 0.15–0.3 × 0.2–0.35 mm.