Carex laxiflora

Lamarck in J. Lamarck et al.

in J. Lamarck et al., Encycl. 3: 392. 1792.

Common names: Carex laxiflore
IllustratedEndemic
Synonyms: Carex laxiflora var. serrulata F. J. Hermann
Treatment appears in FNA Volume 23. Treatment on page 436. Mentioned on page 433, 434, 439.

Culms densely tufted, lateral or central, ascending or lax to decumbent, 39–47 cm × 0.8–2 mm. Leaves: basal sheaths light-brown; sheaths 6–22 mm; blades ascending, midrib and 2 lateral-veins developed, occasionally slightly corrugated, 19–25 cm × 5–26 mm, blades of overwintering leaves smooth or, rarely, sparsely papillose abaxially. Inflorescences: peduncles of proximal spikes erect, 0–3.4 cm, of lateral spikes 1.4–3.3 (–5.3) times as long as spikes they subtend; of terminal spikes 1–2.2 cm. Bracts 7.2–17.5 cm × 2–8 mm, bract blade of distal lateral spikes linear, narrower than spikes, widest bract blade of distalmost lateral spike 0.5–3.4 mm wide. Spikes (3–) 4 per culm; lateral spikes 9–33 × 3.2–4 mm; terminal spike linear to clavate, 23–24 (–34) × 1.5–3 mm. Pistillate scales 2.5–3 × 1.2–1.5 mm, apex acute or apiculate. Staminate scales 3–3.5 × 1–1.5 mm, oblongovate, margins white-hyaline or brownish, apex obtuse or acute. Anthers 2.6–3 mm. Perigynia 3–20 per spike, usually separate, ratio of longer lateral spike length to perigynia number 1.9–3.4, ascending, conspicuously (22–) 25–32-veined, (2.6–) 3.2–4.1 (–4.6) × 1.2–1.6 mm; beak straight, 0.5–1.4 mm. Achenes broadly ellipsoid, 1.8–2.2 (–3.4) × 1–1.4 mm. 2n = 40.


Phenology: Fruiting spring–early summer.
Habitat: Dry or moist, deciduous or mixed deciduous-evergreen forests, higher elevations southward
Elevation: 0–1000 m

Distribution

V23 798-distribution-map.jpg

N.S., Ont., Que., Ala., Ark., Conn., Del., Ga., Ill., Ind., Ky., Maine, Md., Mass., Mich., Miss., Mo., N.H., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Vt., Va., W.Va., Wis.

Discussion

The Carex laxiflora complex contains a wide array of phenotypic variation and deserves further research. F. J. Hermann (1938) proposed the name C. laxiflora var. serrulata; however, among the numerous specimens of C. laxiflora we studied, the key characteristic of ciliate-serrulate bract-sheaths varied greatly.

Selected References

None.

Lower Taxa

None.

"-3.3(-5.3)timesaslongasspikes" is not declared as a valid unit of measurement for this property.

... more about "Carex laxiflora"
0.22 cm2.2 mm <br />0.0022 m <br /> (0.34 cm3.4 mm <br />0.0034 m <br />) +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
ellipsoid +
1mm;1.4mm +
0.26 cm2.6 mm <br />0.0026 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Charles T. Bryson +  and Robert F. C. Naczi +
Lamarck in J. Lamarck et al. +
shortened +
tapering +
Laxiflorae +
straight +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
19 cm190 mm <br />0.19 m <br /> (25 cm250 mm <br />0.25 m <br />) +
papillose +  and corrugated +
m--shaped +
5mm;26mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.34 cm3.4 mm <br />0.0034 m <br />) +
7.2 cm72 mm <br />0.072 m <br /> (17.5 cm175 mm <br />0.175 m <br />) +
ascending +  and appressed +
scale-like +  and leaflike +
0.2 cm2 mm <br />0.002 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
parallel +  and divergent +
terete +, rolled +  and plicate +
Carex laxiflore +
purple +  and brown +
39 cm390 mm <br />0.39 m <br /> (47 cm470 mm <br />0.47 m <br />) +
central +  and lateral +
round +  and trigonous +
0.8mm;2mm +
N.S. +, Ont. +, Que. +, Ala. +, Ark. +, Conn. +, Del. +, Ga. +, Ill. +, Ind. +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Miss. +, Mo. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, R.I. +, S.C. +, Tenn. +, Vt. +, Va. +, W.Va. +  and Wis. +
0–1000 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Dry or moist, deciduous or mixed deciduous-evergreen forests, higher elevations southward +
prophyllate +, pedunculate +  and pistillate +
0.9 cm9 mm <br />0.009 m <br /> (3.3 cm33 mm <br />0.033 m <br />) +
0.32 cm3.2 mm <br />0.0032 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
overwintering +
basal +  and cauline +
brownish +  and white-hyaline +
0 cm0 mm <br />0 m <br /> (3.4 cm34 mm <br />0.034 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
(22-)25-32-veined +
0.41 cm4.1 mm <br />0.0041 m <br /> (0.46 cm4.6 mm <br />0.0046 m <br />) +
not black-mottled +, yellowbrown +  and dark-brown +
0.32 cm3.2 mm <br />0.0032 m <br /> (0.41 cm4.1 mm <br />0.0041 m <br />) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
Fruiting spring–early summer. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
long-sheathing +  and leaflike +
awned +  and acute +
in J. Lamarck et al., Encycl. +
adventitious +
staminate +  and pistillate +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
basal +  and proximal +
2-keeled +
1mm;1.5mm +
cylindric +
0.6 cm6 mm <br />0.006 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
Illustrated +  and Endemic +
1 cm10 mm <br />0.01 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex laxiflora var. serrulata +
Carex laxiflora +
Carex sect. Laxiflorae +
species +
2.4 cm24 mm <br />0.024 m <br /> (3.4 cm34 mm <br />0.034 m <br />) +
linear +  and clavate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
plant +  and cespitose +