Carex molesta

Mackenzie ex Bright

Trillia 9: 4, 20. 1930.

Common names: Carex dérangeant
IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 373. Mentioned on page 336, 340, 344, 370.

Plants cespitose. Culms 35–110 cm; vegetative culms few, inconspicuous, usually fewer than 15 leaves, not strikingly 3-ranked, leaves clustered at apex. Leaves: sheaths adaxially green, narrow hyaline band near collar, adaxially firm, summits U-shaped, smooth; distal ligules 1.5–3.2 mm; blades 3–6 per fertile culm, 12–38 cm × 1.5–4 mm. Inflorescences erect, ± congested, green to light-brown, 1.3–3 (–3.5) cm × 7–16 mm; proximal internode 1.5–6 mm; 2d internode 2.5–6.5 mm; proximal bracts aristate, with bristle tips shorter than inflorescences. Spikes 2–4 (–5), overlapping, globose to ellipsoid, 6–16 × 5–12 mm, base and apex rounded; terminal spike usually lacking conspicuous staminate base. Pistillate scales hyaline-brown, with green or pale midstripe, ovate, 2.9–3.5 mm, much shorter and narrower than perigynia, margins pale, apex acute. Perigynia (25–) 30–80 per spike, spreading at maturity, ascending-spreading, pale-brown, conspicuously 5-veined or more abaxially, conspicuously 0–6-veined adaxially, elliptic to ± orbiculate, planoconvex, (3–) 3.3–4.8 (–5.7) × 1.8–3 mm, 0.5–0.6 mm thick, 1.2–1.8 times as long as wide, margin flat, including wing 0.4–0.8 mm wide, smooth; beak light-brown at tip, flat, 0.7–1.6 (–1.8) mm, ± ciliate-serrulate, abaxial suture with white or hyaline golden brown margin, distance from beak tip to achene 1.6–2.6 mm. Achenes elliptic to narrowly oblong, 1.3–1.7 × 0.9–1.3 mm, 0.5–0.6 mm thick. 2n = 68, 70.


Phenology: Fruiting early summer.
Habitat: Fields, roadsides, bottomlands, open woods, on dry to wet, often heavy, calcareous soils
Elevation: 100–700 m

Distribution

V23 660-distribution-map.jpg

Ont., Que., Ala., Ark., Calif., Conn., Ill., Ind., Iowa, Kans., Ky., Md., Mass., Mich., Minn., Miss., Mo., Nebr., N.H., N.Y., N.Dak., Ohio, Okla., Pa., Tenn., Vt., Va., W.Va., Wis.

Discussion

Carex molesta, often somewhat weedy, is introduced in California.

Selected References

None.

Lower Taxa

None.

"+timesaslongasinflorescences" is not declared as a valid unit of measurement for this property."not undefined" is not a number.

... more about "Carex molesta"
elliptic;narrowly oblong +
smaller +
0.5mm +  and 0.6mm +
bidentatate +
papillose +
Joy Mastrogiuseppe +, Paul E. Rothrock +, A. C. Dibble +  and A. A. Reznicek +
Mackenzie ex Bright +
shortened +
persistent +
conspicuous +
rounded +
not enlarged +
ciliate-serrulate +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
12 cm120 mm <br />0.12 m <br /> (38 cm380 mm <br />0.38 m <br />) +
3 (?) +  and 6 (?) +
v--shaped +
1.5mm;4mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
Carex dérangeant +
inconspicuous +
fertile +  and vegetative +
round +  and trigonous +
35 cm350 mm <br />0.35 m <br /> (110 cm1,100 mm <br />1.1 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
Ont. +, Que. +, Ala. +, Ark. +, Calif. +, Conn. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, Nebr. +, N.H. +, N.Y. +, N.Dak. +, Ohio +, Okla. +, Pa. +, Tenn. +, Vt. +, Va. +, W.Va. +  and Wis. +
100–700 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Fields, roadsides, bottomlands, open woods, on dry to wet, often heavy, calcareous soils +
3 cm30 mm <br />0.03 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
green +  and light-brown +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
not prophyllate +, sessile +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
brown +, hyaline golden +, white +  and pale +
0.4mm +  and 0.8mm +
pale +  and green +
with (1-)3-6(-30) bristles and/or scales +
0-6-veined +  and 5-veined +
ascending-spreading +  and spreading +
0.5mm +  and 0.6mm +
Fruiting early summer. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
sheathless +  and bristlelike +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
adventitious +
hyaline-brown +
basal +  and proximal +
0.29 cm2.9 mm <br />0.0029 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
much shorter and narrower +
herbaceous +  and membranous +
not differentiated +
cylindric +
Illustrated +  and Endemic +
overlapping +
0.6 cm6 mm <br />0.006 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
globose;ellipsoid +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +  and persistent +
2-3(-4)-fid +
u--shaped +
Carex molesta +
Carex sect. Ovales +
species +
plant +  and cespitose +