Schoenoplectus hallii

(A. Gray) S. G. Smith

Novon 5: 101. 1995.

Common names: Hall’s bulrush
IllustratedEndemic
Basionym: Scirpus hallii A. Gray Manual ed. 3, 97. 1862
Synonyms: Scirpus supinus var. hallii (A. Gray) A. Gray
Treatment appears in FNA Volume 23. Treatment on page 59. Mentioned on page 47, 55, 60.

Plants annual; rhizomes 1 mm diam. Culms often arching to decumbent, cylindric, ridged when dry, 0.05–0.8 m × 0.5–1 mm. Leaves 3–4, 1 cauline; sheaths straw-colored to brown and disintegrating to fibers, front translucent and splitting; blades 1–2, proximally thickly C-shaped in cross-section, distally flat, from much shorter to longer than sheath, 1–200+ × 0.2–1 mm, smooth or margins distally spinulose. Inflorescences capitate or 1 spikelet or rarely with 1 or 2 branches to 12 mm; proximal bract erect, resembling leaf-blades, 5–150 mm. Spikelets 1–5, 5–20 × 2–3 mm; scales straw-colored to pale orangebrown to nearly colorless, midrib region usually greenish or pale, ovate, 2.5–3 (–5) × 1.5 mm, smooth or awn sparsely spinulose, margins ciliolate, midrib keeled distally, apex entire, rounded, awn 0.2–0.3 mm or to 3 mm on proximal scale. Flowers: perianth absent; anthers 0.4 mm; styles 2-fid. Spikelet achenes blackish brown, planoconvex or usually the adaxial surface longitudinally concave, ovoid to obovoid, 1.3–1.7 × 1.2–1.3 mm, with 15–18 mostly sharp ridges; beak 0.1 mm. Amphicarpic achenes thickly trigonous with convex abaxial face, 1.7–2.5 × 1.1–1.6 mm, rugose with rounded ridges; beak 0.3 mm. 2n = 22.


Phenology: Fruiting summer–fall.
Habitat: Terrestrial to emergent, freshwater shores, temporary ponds, wet places in cultivated fields, pastures, ditches, sinkholes, prairie
Elevation: 70–700 m

Distribution

V23 89-distribution-map.jpg

Ga., Ill., Ind., Kans., Ky., Mass., Mich., Mo., Nebr., Okla., Wis.

Discussion

Many reports of Schoenoplectus hallii are based on misidentified specimens of S. saximontanus or S. erectus. The Iowa specimen was probably collected in 1890. The species is probably extirpated from Massachusetts. I have identified a specimen from the Georgia coastal plain, where S. hallii and S. erectus are sympatric, as intermediate between the two.

Selected References

None.

Lower Taxa

None.

No values specified."prolonged" is not a number.

... more about "Schoenoplectus hallii"
0.17 cm1.7 mm <br />0.0017 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
trigonous +
1.1mm;1.6mm +
ovoid +  and obovoid +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (?) +
S. Galen Smith +
(A. Gray) S. G. Smith +
shortened +
deciduous +
enlarged +
Scirpus hallii +
0.3 cm3 mm <br />0.003 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (20 cm200 mm <br />0.2 m <br />) +
rudimentary +
1 (?) +  and 2 (?) +
c--shaped +
0.2mm;1mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
Hall’s bulrush +
dorsiventrally flat +  and c-shaped or laterally compressed +
5 cm50 mm <br />0.05 m <br /> (80 cm800 mm <br />0.8 m <br />) +
arching +  and decumbent +
ridged +  and cylindric +
0.5mm;1mm +
Ga. +, Ill. +, Ind. +, Kans. +, Ky. +, Mass. +, Mich. +, Mo. +, Nebr. +, Okla. +  and Wis. +
70–700 m +
hypogynous +  and subtending +
biconvex +  and trigonous +
Terrestrial to emergent, freshwater shores, temporary ponds, wet places in cultivated fields, pastures, ditches, sinkholes, prairie +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
cauline +  and basal +
membranous +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (?) +
curved +  and straight +
with (1-)3-6(-30) bristles and/or scales +
Fruiting summer–fall. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
0.5 cm5 mm <br />0.005 m <br /> (15 cm150 mm <br />0.15 m <br />) +
1 cm10 mm <br />0.01 m <br /> (?) +
inconspicuous +
rounded +  and sharp +
adventitious +
straw-colored +  and pale orangebrown +
deciduous +
basal +  and proximal +
2-keeled +
disintegrating +
shorter to longer +
Illustrated +  and Endemic +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0 cm0 mm <br />0 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
Scirpus supinus var. hallii +
Schoenoplectus hallii +
Schoenoplectus sect. Supini +
species +
not +  and rhizomatous +