Schoenoplectus triqueter

(Linnaeus) Palla

Verh. K. K. Zool.-Bot. Ges. Wien 38(Sitzungsber.): 49. 1888.

Common names: Triangular club-rush
IntroducedIllustrated
Basionym: Scirpus triqueter Linnaeus Mant. Pl. 1: 29. 1767
Treatment appears in FNA Volume 23. Treatment on page 50. Mentioned on page 46, 48.

Rhizomes 1.5–5 mm diam. Culms sharply trigonous, 0.5–1.5 m × 2–4 mm. Leaves 3–4, basal, smooth; sheath fronts not pinnate-fibrillose; blades 1 or 2, thickly V-shaped in cross-section, to equaling sheath length. Inflorescences 1–2 timesbranched or subcapitate or of 1 spikelet, branches to 4 cm; proximal bract usually erect, trigonous, 2–7 cm. Spikelets 1–35, in clusters or solitary, 5–12 × 3–4 mm; scales straw-colored to orangebrown or midrib greenish, usually clearly lineolate-spotted, ovate, 3–3.5 × 2.5 mm, flanks ribless, midrib proximally spinulose, apex acute to rounded, notch 0.3 mm deep, awn 0.3 mm, sparsely spinulose. Flowers: perianth members 4–6, brown, bristlelike, equaling to less than 1/2 of achene body, retrorsely spinulose; anthers 2 mm; crest short, spinulose; styles 2-fid. Achenes brown, biconvex, ovoid to obovoid, 2–2.5 × 1.5–2 mm; beak 0.1–0.2 mm. 2n = 42.


Phenology: Fruiting summer.
Habitat: Freshwater tidal shores, marshes, dredge spoil
Elevation: 0 m

Distribution

V23 69-distribution-map.jpg

Introduced; Oreg., Wash., Eurasia

Discussion

In North America Schoenoplectus triqueter is known only from the tidal Columbia River system (B. W. Lightcap and A. E. Schuyler 1984), where it forms fertile hybrids with S. tabernaemontani [S. ×kuekenthalianus (Junge) D. H. Kent = Scirpus ×scheuchzeri Brugg]. Fertile hybrids between the same species also occur in Europe.

Selected References

None.

Lower Taxa

None.
... more about "Schoenoplectus triqueter"
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
with transverse wavy ridges +  and rugose +
ovoid;obovoid +
1.5mm;2mm +
2 cm20 mm <br />0.02 m <br /> (?) +
S. Galen Smith +
(Linnaeus) Palla +
0.3 cm3 mm <br />0.003 m <br /> (?) +
shortened +
deciduous +
enlarged +
Scirpus triqueter +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
rudimentary +
2 (?) +  and 1 (?) +
v--shaped +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
Triangular club-rush +
dorsiventrally flat +  and c-shaped or laterally compressed +
2mm +  and 10mm +
50 cm500 mm <br />0.5 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
trigonous +
2mm;4mm +
Oreg. +, Wash. +  and Eurasia +
hypogynous +  and subtending +
biconvex +  and trigonous +
Freshwater tidal shores, marshes, dredge spoil +
of 1 spikelet +  and subcapitate +
1-3 times branched or capitate or of 1 spikelet +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
cauline +  and basal +
membranous +
lineolate-spotted +  and greenish +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
curved +  and straight +
with (1-)3-6(-30) bristles and/or scales +
Fruiting summer. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
2 cm20 mm <br />0.02 m <br /> (7 cm70 mm <br />0.07 m <br />) +
Verh. K. K. Zool.-Bot. Ges. Wien +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
adventitious +
straw-colored +  and orangebrown +
deciduous +
basal +  and proximal +
2-keeled +
not pinnate-fibrillose +
Introduced +  and Illustrated +
solitary +  and cluster +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
1 +  and 35 +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
Schoenoplectus triqueter +
Schoenoplectus sect. Schoenoplectus +
species +
not +  and rhizomatous +