Carex haydenii

Dewey

Amer. J. Sci. Arts, ser. 2, 18: 103. 1854.

Common names: Carex de Hayden
IllustratedEndemic
Synonyms: Carex acuta var. erecta Dewey Carex rousseaui Raymond Carex stricta var. decora L. H. Bailey Carex stricta var. haydenii (Dewey) Kükenthal
Treatment appears in FNA Volume 23. Mentioned on page 395.

Plants cespitose. Culms acutely angled, 30–115 cm, scabrous. Leaves: basal sheaths redbrown, indistinctly ladder-fibrillose; sheaths of proximal leaves glabrous, fronts with redbrown spots, veinless, apex U-shaped; blades 3–5 mm wide. Inflorescences: proximal bract subequal to inflorescence, 2–4 mm wide. Spikes erect; proximal 2–3 spikes pistillate, 1–5 cm × 4–6 mm, base obtuse; terminal 1–2 spikes staminate. Pistillate scales redbrown, longer than perigynia, apex acute or acuminate, awnless. Perigynia divergent, olive-brown with redbrown spots on apical 1/2, veinless, inflated, loosely enclosing achenes, obovoid, 1.5–2.8 × 1.5–2 mm, dull, apex rounded, papillose; beak green, 0.1–0.2 mm. Achenes not constricted, glaucous. 2n = 54.


Phenology: Fruiting Jun–Aug.
Habitat: Wet meadows, moist prairies
Elevation: 0–1,000 m

Distribution

V23 704-distribution-map.jpg

N.B., Ont., Que., Ill., Ind., Iowa, Maine, Mass., Mich., Minn., Mo., Nebr., N.H., N.Y., N.Dak., Ohio, Pa., S.Dak., Vt., Wis.

Discussion

Carex haydenii is a species of seasonally saturated soils in open habitats. It appears to be declining in abundance with changes in land use.

Carex haydenii is often confused with C. stricta; it can be identified by the inflated perigynia that are rounded apically, acute scales, and glabrous leaves and sheaths. Only basal sheaths of C. haydenii are ladder-fibrillose. Although often sympatric with C. stricta and C. nigra, no hybrids appear to be formed.

Selected References

None.

Lower Taxa

None.
... more about "Carex haydenii"
biconvex +
not constricted +
awnless +  and veinless +
redbrown spots +
papillose +
redbrown spots +
Lisa A. Standley +, Jacques Cayouette +  and Leo Bruederle +
shortened +
ladder-fibrillose +
not +  and fibrous +
bidentate +  and emarginate +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
m--shaped +  and v--shaped +
3mm;5mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
Carex de Hayden +
redbrown +  and brown +
30 cm300 mm <br />0.3 m <br /> (115 cm1,150 mm <br />1.15 m <br />) +
prophyllate +, subsessile +, pedunculate +  and staminate +
N.B. +, Ont. +, Que. +, Ill. +, Ind. +, Iowa +, Maine +, Mass. +, Mich. +, Minn. +, Mo. +, Nebr. +, N.H. +, N.Y. +, N.Dak. +, Ohio +, Pa. +, S.Dak. +, Vt. +  and Wis. +
0–1,000 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Wet meadows, moist prairies +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
with (1-)3-6(-30) bristles and/or scales +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
spreading +, ascending +  and erect +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Fruiting Jun–Aug. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
short-sheathing +, sheathless +  and leaflike +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Amer. J. Sci. Arts, ser. +
adventitious +
basal +  and proximal +
2-keeled +
ladder-fibrillose +  and veined +
cylindric +
Illustrated +  and Endemic +
staminate +  and pistillate +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex acuta var. erecta +, Carex rousseaui +, Carex stricta var. decora +  and Carex stricta var. haydenii +
Carex haydenii +
Carex sect. Phacocystis +
species +
, +  and staminate +
plant +  and cespitose +