Carex schweinitzii

Dewey ex Schweinitz

Ann. Lyceum Nat. Hist. New York 1: 71. 1824.

Common names: Carex de Schweinitz
IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 509. Mentioned on page 502, 508, 510.

Plants extensively colonial; rhizomes long. Culms trigonous in cross-section, 18–65 cm, smooth distally. Leaves: basal sheaths pale-brown; ligules as wide to wider than long; blades pale to mid green, flat to W-shaped, 4–11 mm wide, glabrous. Inflorescences 8–24 cm; proximal bract 11–37 cm, exceeding inflorescence; proximal 2–4 spikes pistillate, erect or often the proximal ascending to spreading; terminal 1 (–2) spikes staminate. Pistillate scales lanceolate-acuminate, 2.4–6.9 × 0.3–0.9 mm, shorter than or the proximal longer than perigynia, margins serrulate-ciliate, apex with prominent scabrous awn. Staminate scales acute to acuminate, smooth except at tip. Perigynia ascending, 7–11-veined, narrowly elliptic, 4.2–7 × 1.3–1.8 mm, apex tapered; beak 1.4–2.4 mm, bidentulate, smooth, teeth straight, 0.2–0.5 mm. Stigmas 3. Achenes pale-brown, trigonous, smooth.


Phenology: Fruiting Jun–Jul.
Habitat: Shallow cold streams, springheads, seeps, margins of fens, and seepy stream, pond, and lakeshores in open or lightly shaded sites, in highly calcareous soils
Elevation: 100–600 m

Distribution

V23 948-distribution-map.jpg

Ont., Conn., Mass., Mich., Mo., N.Y., Pa., Vt., Va., Wis.

Discussion

Carex schweinitzii is very local and uncommon but often forms large colonies where present. It hybridizes occasionally with C. hystericina. The single, old Missouri collection (G. Yatskievych 1999+) seems so far disjunct as to suggest that there may have been a label mixup.

Selected References

None.

Lower Taxa

None.
... more about "Carex schweinitzii"
trigonous +
awned +  and awnless +
not papillose +
A. A. Reznicek +  and Bruce A. Ford +
Dewey ex Schweinitz +
prominent +
shortened +
not +  and fibrous +
truncate +  and rounded +
Vesicariae +
bidentulate +
emarginate +  and bidentate +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
green +  and pale +
flat +  and w-shaped +
4mm;11mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
Carex de Schweinitz +
brown +, reddish-brown +  and reddish purple +
trigonous +
18 cm180 mm <br />0.18 m <br /> (65 cm650 mm <br />0.65 m <br />) +
Ont. +, Conn. +, Mass. +, Mich. +, Mo. +, N.Y. +, Pa. +, Vt. +, Va. +  and Wis. +
100–600 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Shallow cold streams, springheads, seeps, margins of fens, and seepy stream, pond, and lakeshores in open or lightly shaded sites, in highly calcareous soils +
8 cm80 mm <br />0.08 m <br /> (24 cm240 mm <br />0.24 m <br />) +
prophyllate +, pedunculate +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
wide to wider than long +
with (1-)3-6(-30) bristles and/or scales +
0.42 cm4.2 mm <br />0.0042 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
Fruiting Jun–Jul. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
short-sheathed +, sheathless +  and leaflike +
ascending;spreading +
11 cm110 mm <br />0.11 m <br /> (37 cm370 mm <br />0.37 m <br />) +
Ann. Lyceum Nat. Hist. New York +
adventitious +
staminate +  and pistillate +
green +  and dark-brown +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.69 cm6.9 mm <br />0.0069 m <br />) +
basal +  and proximal +
acute;acuminate +
0.3mm;0.9mm +
septate-nodulose +
Illustrated +  and Endemic +
staminate +  and pistillate +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
persistent +
2-3(-4)-fid +
Carex schweinitzii +
Carex sect. Vesicariae +
species +
straight +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
plant +  and colonial +