Schoenoplectus etuberculatus

(Steudel) Soják

Cas. Nár. Mus., Odd. Prír. 140: 127. 1972.

IllustratedEndemic
Basionym: Rhynchospora etuberculata Steudel Syn. Pl. Glumac. 2: 142. 1855
Synonyms: Scirpus etuberculatus (Steudel) Kuntze
Treatment appears in FNA Volume 23. Treatment on page 53. Mentioned on page 46, 51.

Plants mat-forming; rhizomes 1–3 mm diam. Culms proximally bluntly and distally sharply trigonous, 0.6–2 m × 3–5 mm. Leaves 5–20+, nearly equaling culm; sheath fronts delicately pinnate-fibrillose; blades 2–6+, smooth; distal blade longer than sheath, 2–10 mm wide, smooth; emergent blades stiff, cross-section thickly V-shaped to trigonous near ligule, central region acutely trigonous and laterally flattened, distal region laterally flattened, apex often asymmetric; submerged blades often flaccid, ribbonlike. Inflorescences 2–3 times branched, 2–3 proximal internodes elongated, branches to 16 cm; proximal bract erect, resembling emergent leaf-blade, 7–32 cm. Spikelets 3–20, 10–25 × 5–6 mm; scales straw-colored to orangebrown or flanks red, central region usually greenish, aging brown, ovatelanceolate, 5–7 × 3 mm, smooth, margins sometimes ciliolate at 40X, apex acute, entire, mucro to 0.2 mm. Flowers: perianth bristles 6, medium brown to reddish, equaling achene, sparsely spinulose; anthers 3–3.5 mm; styles 3-fid. Achenes medium brown, ovoid to obovoid, compressedtrigonous, 3–4.5 × 1.7–2 mm; beak 0.7–2 mm.


Phenology: Fruiting late spring–summer.
Habitat: Emergent (to submerged), in fresh to slightly brackish ponds and marshes, spring-fed streams, mainly on coastal plains
Elevation: 10–100 m

Distribution

V23 75-distribution-map.jpg

Ala., Del., Fla., Ga., La., Md., Miss., Mo., N.C., R.I., S.C., Tex., Va.

Discussion

Scirpus etuberculatus was placed in Scirpus sect. Bolboschoenus by T. Koyama (1958) and G. C. Tucker (1987).

Selected References

None.

Lower Taxa

None.

"prolonged" is not a number.

0.3 cm3 mm <br />0.003 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
with transverse wavy ridges +  and rugose +
ovoid;obovoid +
1.7mm;2mm +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
entire +  and asymmetric +
S. Galen Smith +
(Steudel) Soják +
shortened +
deciduous +
enlarged +
Rhynchospora etuberculata +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
submerged +  and emergent +
rudimentary +
2 (?) +  and 6 (?) +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
brown +  and greenish +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
ovatelanceolate +, flattened +  and trigonous +
thickly v-shaped +  and trigonous +
60 cm600 mm <br />0.6 m <br /> (200 cm2,000 mm <br />2 m <br />) +
trigonous +
3mm;5mm +
0.2 cm2 mm <br />0.002 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Ala. +, Del. +, Fla. +, Ga. +, La. +, Md. +, Miss. +, Mo. +, N.C. +, R.I. +, S.C. +, Tex. +  and Va. +
10–100 m +
hypogynous +  and subtending +
biconvex +  and trigonous +
Emergent (to submerged), in fresh to slightly brackish ponds and marshes, spring-fed streams, mainly on coastal plains +
2-3 times branched 2-3 proximal internodes elongated +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
cauline +  and basal +
membranous +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
curved +  and straight +
with (1-)3-6(-30) bristles and/or scales +
Fruiting late spring–summer. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
7 cm70 mm <br />0.07 m <br /> (32 cm320 mm <br />0.32 m <br />) +
Cas. Nár. Mus., Odd. Prír. +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
adventitious +
straw-colored +  and orangebrown +
deciduous +
distinct +
basal +  and proximal +
2-keeled +
pinnate-fibrillose +
Illustrated +  and Endemic +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
3 +  and 20 +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
Scirpus etuberculatus +
Schoenoplectus etuberculatus +
Schoenoplectus sect. Malacogeton +
species +
not +  and rhizomatous +
plant +  and mat-forming +