Carex willdenowii

Schkuhr ex Willdenow

Sp. Pl. 4(1): 211. 1805.

Common names: Willdenow’s sedge
IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 559. Mentioned on page 560.

Culms erect or spreading, (3.1–) 8.2–29.7 cm, 0.4–0.9 of total plant height. Leaves: basal sheaths pale to medium brown; blades green, exceeding culms, 1.3–3.2 mm wide, herbaceous, margins green, smooth or slightly scabrous. Lateral spikes (0–) 2–4, basal, on widely spreading to nodding peduncles. Terminal spike with staminate portion 3–29-flowered, 3.4–8.6 (–10.3) × 0.7–1.4 mm; pistillate portion 3–9-flowered. Pistillate scales green, margins hyaline, white, often with reddish-brown tinge, 1.6–2.22 mm wide, not more than 1.5 times as wide as and not concealing perigynia, apex attenuate into green awns; distal scales with hyaline margins 0.3–0.8 mm, apex acute, awnless. Staminate scales green or tinged with brown subapically, 1.4–2.8 × 1.8–2.2 mm, margins free but enfolding scales above, hyaline, white, apex obtuse, erose. Anthers 0.9–1.1 mm. Perigynia 3–9 per spike, pale green to olive or pale-brown, unspeckled, narrowly ovoid to lanceovoid, (4.5–) 4.9–5.7 (–6.5) × 1.2–1.7 mm, 1.2–2.2 times as long as wide, tightly enveloping achenes, apex gradually tapering; beak (1.7–) 1.9–2.6 (–2.8) mm, scabrous. Stigmas filiform, flexuous, long, slender, strongly papillose. Achenes brown, oblong, (1.8–) 2.1–2.5 (–2.6) × (1.2–) 1.3–1.5 (–1.6) mm. 2n = 62, 78.


Phenology: Fruiting spring–summer (late Apr–late Jul).
Habitat: Acidic, dry mesic, open, oak-dominated woodlands, often on ridges and slopes
Elevation: 50–900 m

Distribution

V23 1064-distribution-map.jpg

Ont., Ala., Ark., Conn., Del., D.C., Ill., Ind., Ky., Md., Mass., Mo., N.J., N.Y., N.C., Ohio, Pa., S.C., Tenn., Vt., Va., W.Va.

Discussion

The Carex willdenowii group (C. willdenowii, C. basiantha & C. superata) differs from the other members of the section in having asynchronous spike production, resulting in a protracted fruiting season (R. F. C. Naczi et al. 1998).

Selected References

None.

Lower Taxa

None.
... more about "Carex willdenowii"
0.25 cm2.5 mm <br />0.0025 m <br /> (0.26 cm2.6 mm <br />0.0026 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
0.21 cm2.1 mm <br />0.0021 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
1.3mm;1.5mm +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
William J. Crins +, Robert F. C. Naczi +, A. A. Reznicek +  and Bruce A. Ford +
Schkuhr ex Willdenow +
shortened +
pale;medium brown +
tapering +
0.26 cm2.6 mm <br />0.0026 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
flattened-triangular +
0.19 cm1.9 mm <br />0.0019 m <br /> (0.26 cm2.6 mm <br />0.0026 m <br />) +
v--shaped +
1.3mm;3.2mm +
smaller +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
Willdenow’s sedge +
2 +  and widest +
spreading +  and erect +
round +  and trigonous +
8.2 cm82 mm <br />0.082 m <br /> (29.7 cm297 mm <br />0.297 m <br />) +
Ont. +, Ala. +, Ark. +, Conn. +, Del. +, D.C. +, Ill. +, Ind. +, Ky. +, Md. +, Mass. +, Mo. +, N.J. +, N.Y. +, N.C. +, Ohio +, Pa. +, S.C. +, Tenn. +, Vt. +, Va. +  and W.Va. +
50–900 m +
white +  and hyaline +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Acidic, dry mesic, open, oak-dominated woodlands, often on ridges and slopes +
septate-nodulose +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
stipitate +  and 2-veined +
hyaline +, white +  and green +
lanceolate;oblong-lanceolate rounded-trigonous +
1.5+ times as wide as and not concealing perigynia +  and wide +
with (1-)3-6(-30) bristles and/or scales +
veined +  and veinless +
0.57 cm5.7 mm <br />0.0057 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
unspeckled +, pale green +  and olive or pale-brown +
0.49 cm4.9 mm <br />0.0049 m <br /> (0.57 cm5.7 mm <br />0.0057 m <br />) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
Fruiting spring–summer (late Apr–late Jul). +
2-3(-4)-carpellate +
3-9-flowered +, pistillate +, 3-29-flowered +  and staminate +
3 (?) +  and 1 (?) +
adventitious +
staminate +  and pistillate +
tinged with brown +  and green +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
basal +  and proximal +
2-keeled +
1.8mm;2.2mm +
septate-nodulose +
Illustrated +  and Endemic +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillose +
filiform +
slender +
deciduous +
dilated +
Carex willdenowii +
Carex sect. Phyllostachyae +
species +
0.86 cm8.6 mm <br />0.0086 m <br /> (1.03 cm10.3 mm <br />0.0103 m <br />) +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
plant +  and cespitose +