Schoenoplectus sect. Malacogeton

(Ohwi) S. G. Smith & Hayasaka

J. Jap. Bot. 76: 340. 2001.

Basionym: Scirpus sect. Malacogeton Ohwi Mem. Coll. Sci. Kyoto Imp. Univ., Ser. B, Biol. 18: 97. 1944
Treatment appears in FNA Volume 23.

Plants perennial; rhizomes spreading, conspicuous, long, weak, soft, flaccid; tuber occasionally present, terminal (and sometimes subterminal). Culms 0.5–2–3 mm wide. Leaves all basal; blades often flaccid. Inflorescences 1–3 times branched or capitate or of 1 spikelet. Spikelets: scales with usually 3–11 distinct or obscure parallel ribs (veins), at least in proximal part of spikelet, apex entire or obscurely emarginate, usually mucronate. Flowers: perianth segments bristlelike, spinulose; amphicarpic flowers absent. Achenes trigonous, 2.5–4.5 mm, smooth.

Distribution

North America, e Asia

Discussion

Species 4 or 5 (3 in the flora).

The North American species are the most aquatic of all North American Schoenoplectus (S. G. Smith and E. Hayasaka 2001).

Selected References

None.

"prolonged" is not a number.

with transverse wavy ridges +  and rugose +
trigonous +
3 cm30 mm <br />0.03 m <br /> (?) +
emarginate +  and entire +
S. Galen Smith +
(Ohwi) S. G. Smith & Hayasaka +
shortened +
deciduous +
enlarged +
Scirpus sect. Malacogeton +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
rudimentary +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
dorsiventrally flat +  and c-shaped or laterally compressed +
cylindric +  and strongly trigonous +
0.5mm;2-3mm +
North America +  and e Asia +
hypogynous +  and subtending +
biconvex +  and trigonous +
1-3 times branched or capitate or of 1 spikelet +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
cauline +  and basal +
membranous +
curved +  and straight +
with (1-)3-6(-30) bristles and/or scales +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
J. Jap. Bot. +
adventitious +
deciduous +
distinct +
basal +  and proximal +
2-keeled +
0.3 cm3 mm <br />0.003 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
2-3-fid +
Schoenoplectus sect. Malacogeton +
Schoenoplectus +
section +
not +  and rhizomatous +