Schoenoplectus acutus var. acutus

Common names: Hard-stem bulrush scirpe aigu
Treatment appears in FNA Volume 23. Treatment on page 49. Mentioned on page 48.

Culms dark green, 1–3 m × 2–6 mm, very firm, rarely soft, air cavities in distal 1/4 mostly 0.5 mm wide. Leaves: sheath fronts coarsely pinnate-fibrillose. Inflorescences 2 times branched, branches mostly stiffly ascending. Spikelets 3–40, 6–18 × 3–4 mm. Flowers: perianth bristles 6, equaling achene body; styles 2-fid. Achenes planoconvex. 2n = 36, 38.


Phenology: Fruiting summer.
Habitat: Fresh, often calcareous to brackish marshes, fens, lakes, slow streams, often emergent in water to 1.5 m
Elevation: 0–2700 m

Distribution

V23 66-distribution-map.jpg

Alta., B.C., Man., N.B., N.W.T., N.S., Ont., P.E.I., Que., Sask., Yukon, Alaska, Ark., Colo., Conn., Del., Idaho, Ill., Ind., Iowa, Kans., Ky., Maine, Md., Mass., Mich., Minn., Mo., Mont., Nebr., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Okla., Pa., R.I., S.Dak., Tex., Vt., Va., Wash., Wis., Wyo., probably Eurasia

Discussion

Selected References

None.

Lower Taxa

None.

"prolonged" is not a number.

with transverse wavy ridges +  and rugose +
planoconvex +
2 cm20 mm <br />0.02 m <br /> (?) +
S. Galen Smith +
(Muhlenberg ex Bigelow) Á. Löve & D. Löve +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
shortened +
deciduous +
enlarged +
Scirpus acutus +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
usually much shorter +
rudimentary +
1 (?) +  and 2 (?) +
c-shaped +  and dorsiventrally flat +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
Hard-stem bulrush +  and scirpe aigu +
dorsiventrally flat +  and c-shaped or laterally compressed +
dark green +
2mm +  and 10mm +
100 cm1,000 mm <br />1 m <br /> (300 cm3,000 mm <br />3 m <br />) +
cylindric +
2mm;6mm +
0.8 cm8 mm <br />0.008 m <br /> (12 cm120 mm <br />0.12 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Alta. +, B.C. +, Man. +, N.B. +, N.W.T. +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Alaska +, Ark. +, Colo. +, Conn. +, Del. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mo. +, Mont. +, Nebr. +, N.H. +, N.J. +, N.Y. +, N.C. +, N.Dak. +, Ohio +, Okla. +, Pa. +, R.I. +, S.Dak. +, Tex. +, Vt. +, Va. +, Wash. +, Wis. +, Wyo. +  and probably Eurasia +
0–2700 m +
hypogynous +  and subtending +
membranous-translucent +
biconvex +  and trigonous +
Fresh, often calcareous to brackish marshes, fens, lakes, slow streams, often emergent in water to 1.5 m +
2 times branched branches mostly stiffly ascending +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
cauline +  and basal +
membranous +
scabridulous +
v--shaped +
curved +  and straight +
with (1-)3-6(-30) bristles and/or scales +
Fruiting summer. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
1 cm10 mm <br />0.01 m <br /> (9 cm90 mm <br />0.09 m <br />) +
Bull. Torrey Bot. Club +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
adventitious +
sparsely +  and often densely reddish or straw-colored +
deciduous +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
basal +  and proximal +
spinulose-papillose +
2mm;3mm +
pinnate-fibrillose +
W2 +, W1 +  and Illustrated +
0.6 cm6 mm <br />0.006 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
3 +  and 40 +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
Schoenoplectus acutus var. acutus +
Schoenoplectus acutus +
variety +
not +  and rhizomatous +