Schoenoplectus sect. Actaeogeton

(Reichenbach) J. Raynal

Adansonia, n.s. 16: 130. 1976.

Basionym: Scirpus sect. Actaegeton Reichenbach Fl. Germ. Excurs., 78. 1830
Treatment appears in FNA Volume 23.

Plants annual or rarely perennial, cespitose; rhizomes inconspicuous, very short, firm [perennials, rhizomes long]. Culms 0.5–3 mm diam. Leaves all basal. Inflorescences capitate or of 1 spikelet [sometimes branched]. Spikelets: scales each with 3–11 distinct parallel ribs in proximal part of spikelet, apex entire, mostly mucronate. Flowers: perianth present or absent, segments bristlelike, spinulose; amphicarpic flowers absent. Achenes plane or biconvex, sometimes trigonous, rugulose, without prominent, transverse, wavy ridges.

Distribution

Worldwide, mostly in eastern Asia, the Pacific Islands, and e North America

Discussion

Species ca. 23 (3 in the flora).

Selected References

None.

"prolonged" is not a number.

trigonous;biconvex;plane +
3 cm30 mm <br />0.03 m <br /> (?) +
S. Galen Smith +
(Reichenbach) J. Raynal +
shortened +
deciduous +
enlarged +
Scirpus sect. Actaegeton +
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 +
0.5mm +  and 3mm +
cylindric +  and strongly trigonous +
Worldwide +, mostly in eastern Asia +, the Pacific Islands +  and and e North America +
hypogynous +  and subtending +
biconvex +  and trigonous +
of 1 spikelet +  and capitate +
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 (?) +
Adansonia, n.s. +
inconspicuous +
distinct +
adventitious +
deciduous +
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. Actaeogeton +
Schoenoplectus +
section +
not +  and rhizomatous +
perennial +  and annual +
plant +  and cespitose +