Carex amphibola

Steudel

Syn. Pl. Glumac. 2: 234. 1855.

IllustratedEndemic
Synonyms: Carex grisea var. amphibola (Steudel) Kükenthal
Treatment appears in FNA Volume 23. Mentioned on page 460.

Plants densely cespitose; rhizo1me internodes 1.2–2 mm thick. Culms dark purple-red to 0.3–2.4 (–7.3) cm high or very rarely brown at base, 15–80 cm. Leaves: sheaths glabrous; blades green, widest blades (3.7–) 4.4–7 mm wide, smooth abaxially. Inflorescences 0.48–0.93 of culm height; peduncles of lateral spikes glabrous or barely scaberulous; peduncles of terminal spikes 1.6–21 (–37) mm, usually barely exceeding lateral spikes; proximal bract sheaths loose, glabrous abaxially, sheath front slightly concave to slightly convex, elongated 0.6–2.2 (–5) mm beyond apex; ligules (1.8–) 3.4–7.8 (–12.9) mm; distal bract much exceeding terminal spike. Spike (3–) 4–5, distal 2–4 overlapping; lateral spikes pistillate, with 3–18 perigynia, 5–26 × 4.6–9.8 mm, ratio of spike length (in mm) to flower number = 1.3–1.9; terminal spikes 7–34 × 1.1–2.7 mm. Pistillate scales 3.7–8 × 1.2–2.4 mm, margins whitish and usually with redbrown speckles, entire, apex with awn 1.1–6 mm. Staminate scales 3.6–4.9 × 1.1–1.9 mm. Anthers 2–2.8 mm. Perigynia spirally imbricate, 52–64-veined, unwrinkled to wrinkled, oblong-lanceoloid to narrowly oblong-ovoid, obtusely triangular in cross-section, 4.2–5 (–5.2) × 1.5–1.9 (–2.2) mm, (2.2–) 2.5–3.1 times as long as wide, lustrous, base very gradually tapered, apex gradually tapered; beak absent or straight, 0–0.2 mm. Achenes broadly obovoid to oblong-obovoid, widest at 0.55–0.67 (–0.7) of body length, (2.6–) 2.8–3.4 × (1.3–) 1.5–1.7 (–1.8) mm, loosely enveloped by perigynia; stipe straight, (0.3–) 0.4–0.6 mm; beak straight, 0.3–0.6 mm.


Phenology: Fruiting spring–early summer.
Habitat: Mesic deciduous forests, usually in acidic loams on flood plains, slopes above streams, and uplands
Elevation: 10–1000 m

Distribution

V23 846-distribution-map.jpg

Ont., Ala., Ark., Conn., Del., D.C., Ga., Ill., Ind., Ky., La., Md., Mass., Mich., Miss., Mo., N.J., N.Y., N.C., Ohio, Okla., Pa., S.C., Tenn., Tex., Va., W.Va.

Discussion

The wide-ranging, habitat generalist Carex amphibola is the most common member of Carex sect. Griseae. It grows with many other members of the section, most often C. bulbostylis, C. corrugata, C. glaucodea, C. grisea, C. oligocarpa, and C. planispicata.

Selected References

None.

Lower Taxa

None.
... more about "Carex amphibola"
0.26 cm2.6 mm <br />0.0026 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.34 cm3.4 mm <br />0.0034 m <br />) +
broadly obovoid;oblong-obovoid +
smaller +
1.5mm;1.7mm +
0.2 cm2 mm <br />0.002 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
Robert F. C. Naczi +  and Charles T. Bryson +
Steudel +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
shortened +
tapered +
Griseae +
straight +
excurved +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
m--shaped +
0mm;20mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
brown +  and dark purple-red +
0.3 cm3 mm <br />0.003 m <br /> (?) +  and 2.4 cm24 mm <br />0.024 m <br /> (?) +
round +  and trigonous +
15 cm150 mm <br />0.15 m <br /> (80 cm800 mm <br />0.8 m <br />) +
Ont. +, Ala. +, Ark. +, Conn. +, Del. +, D.C. +, Ga. +, Ill. +, Ind. +, Ky. +, La. +, Md. +, Mass. +, Mich. +, Miss. +, Mo. +, N.J. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, S.C. +, Tenn. +, Tex. +, Va. +  and W.Va. +
10–1000 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Mesic deciduous forests, usually in acidic loams on flood plains, slopes above streams, and uplands +
0.48 +  and 0.93 +
0.12 cm1.2 mm <br />0.0012 m <br /> (?) +  and 0.2 cm2 mm <br />0.002 m <br /> (?) +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
0.34 cm3.4 mm <br />0.0034 m <br /> (0.78 cm7.8 mm <br />0.0078 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
0.5 cm5 mm <br />0.005 m <br /> (0.52 cm5.2 mm <br />0.0052 m <br />) +
0.19 cm1.9 mm <br />0.0019 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
yellowbrown +  and dark-brown +
(2.2-)2.5-3.1 +
0.42 cm4.2 mm <br />0.0042 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
unwrinkled +  and wrinkled +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.19 cm1.9 mm <br />0.0019 m <br />) +
Fruiting spring–early summer. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
Syn. Pl. Glumac. +
adventitious +
staminate +  and pistillate +
0.36 cm3.6 mm <br />0.0036 m <br /> (0.49 cm4.9 mm <br />0.0049 m <br />) +
basal +  and proximal +
2-keeled +
1.1mm;1.9mm +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
slightly concave +  and slightly convex +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
cylindric +
Illustrated +  and Endemic +
2.1 cm21 mm <br />0.021 m <br /> (3.7 cm37 mm <br />0.037 m <br />) +
scaberulous +  and glabrous +
0.16 cm1.6 mm <br />0.0016 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
straight +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (?) +  and 0.06 cm0.6 mm <br />6.0e-4 m <br /> (?) +
deciduous +
2-3(-4)-fid +
Carex grisea var. amphibola +
Carex amphibola +
Carex sect. Griseae +
species +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
plant +  and cespitose +
4.4mm +  and 7mm +