Carex thornei

Naczi

Novon 12: 516, fig. 4. 2002.

Treatment appears in FNA Volume 23. Treatment on page 455. Mentioned on page 451, 453.

Plants densely cespitose; rhizome internodes 0.8–6.4 mm, 1.2–2.2 mm thick. Culms purple-red to 4.8–8.1 cm at base, 24–53 cm; vegetative shoots 28–49 cm, 0.5–1.3 times as tall as culms. Leaves green, widest blades 2.1–4 mm wide. Inflorescences 13–38 cm, 0.77–0.96 of culm height; internode between proximalmost scales in proximalmost spike 1.7–2.9 mm; internode between distal lateral spikes (1.6–) 3.4–15.2 cm, longest internode between distal lateral spikes (5.3–) 8.8–15.2 cm; longest peduncle per plant of terminal lateral spikes (2.2–) 5.1–10.4 cm; proximal bract sheaths tight, hyaline band of sheath front with apex usually truncate or concave, occasionally convex, elongated to 2.2 (–5) mm beyond apex; ligules 4–4.9 (–9.6) mm; blades uniformly green, bract blade of distalmost lateral spike slightly exceeding or exceeded by terminal spike, longest bract blade of distalmost lateral spike 3.9–11 cm. Spikes 4–5, usually separate or the distal 2 (–3) overlapping; lateral spikes pistillate, with 3–12 perigynia, longest per plant with 6–12, 5–21 × 3.2–4.1 mm, ratio of longest lateral spike (in mm) to flower number = 1.8–2.1; terminal spike 16–32 × 1.9–2.5 mm, longest per plant 17–36 mm, exceeding distalmost lateral spike. Pistillate scales 3–4.6 × 1.6–2 mm, body 1.6–2.6 mm, midrib prolonged as awn 1.1–2.5 mm. Staminate scales 4.3–5 × 1.4–1.8 mm, apex usually acute, occasionally obtuse, awnless. Perigynia distichously imbricate, prominently 53–64-veined, narrowly obovate or narrowly oblong in outline, 3.8–4.9 × 1.4–1.7 mm, (2.4–) 2.5–3.1 times as long as wide, 1.7–2 times as long as achene bodies, base gradually tapered, apex gradually tapered; beak absent or straight, 0–0.4 mm, 0–11% of perigynium length. Achenes 2.6–3.5 × 1.3–1.6 mm, tightly enveloped by perigynia, base abruptly contracted, apex abruptly contracted; stipe 0.2–0.6 mm; body 2.1–2.7 mm; beak straight, 0.1–0.4 (–1.5) mm.


Phenology: Fruiting spring.
Habitat: Mesic deciduous forests, in sandy loams, usually on upper portions of flood plains and adjacent slopes
Elevation: 40–100 m

Discussion

Of conservation concern.

Carex thornei is endemic to the drainage of the lower Chattahoochee, lower Flint, and upper Apalachicola rivers. It frequently occurs with C. abscondita and C. basiantha.

Selected References

None.

Lower Taxa

None.

"prolonged" is not a number."-2timesaslongasachenebodies" is not declared as a valid unit of measurement for this property.

... more about "Carex thornei"
0.26 cm2.6 mm <br />0.0026 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
trigonous +
smaller +
1.3mm;1.6mm +
Robert F. C. Naczi +  and Charles T. Bryson +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
shortened +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
elongated +
0 cm0 mm <br />0 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
tapered +
Griseae +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
straight +
excurved +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
1.6 cm16 mm <br />0.016 m <br /> (3.4 cm34 mm <br />0.034 m <br />) +
3.4 cm34 mm <br />0.034 m <br /> (15.2 cm152 mm <br />0.152 m <br />) +
m--shaped +
0mm;20mm +
0.21 cm2.1 mm <br />0.0021 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
exceeded by terminal spike +  and exceeding +
3.9 cm39 mm <br />0.039 m <br /> (11 cm110 mm <br />0.11 m <br />) +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
purple-red +
round +  and trigonous +
24 cm240 mm <br />0.24 m <br /> (53 cm530 mm <br />0.53 m <br />) +
Ala. +, Fla. +  and Ga. +
40–100 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
1.8 +  and 2.1 +
biconvex +  and trigonous +
Mesic deciduous forests, in sandy loams, usually on upper portions of flood plains and adjacent slopes +
0.77 +  and 0.96 +
13 cm130 mm <br />0.13 m <br /> (38 cm380 mm <br />0.38 m <br />) +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
0.4 cm4 mm <br />0.004 m <br /> (0.49 cm4.9 mm <br />0.0049 m <br />) +
0.38 cm3.8 mm <br />0.0038 m <br /> (0.49 cm4.9 mm <br />0.0049 m <br />) +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
yellowbrown +  and dark-brown +
(2.4-)2.5-3.1 +
Fruiting spring. +
2-3(-4)-carpellate +
2.2 cm22 mm <br />0.022 m <br /> (5.1 cm51 mm <br />0.051 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
1.7 cm17 mm <br />0.017 m <br /> (3.6 cm36 mm <br />0.036 m <br />) +
0.32 cm3.2 mm <br />0.0032 m <br /> (0.41 cm4.1 mm <br />0.0041 m <br />) +
3 (?) +  and 1 (?) +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.29 cm2.9 mm <br />0.0029 m <br />) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
adventitious +
staminate +  and pistillate +
0.43 cm4.3 mm <br />0.0043 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
basal +  and proximal +
2-keeled +
1.4mm;1.8mm +
hispidulous +
cylindric +
0.5-1.3 times as tall as culms +
28 cm280 mm <br />0.28 m <br /> (49 cm490 mm <br />0.49 m <br />) +
5.3 cm53 mm <br />0.053 m <br /> (8.8 cm88 mm <br />0.088 m <br />) +
8.8 cm88 mm <br />0.088 m <br /> (15.2 cm152 mm <br />0.152 m <br />) +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (?) +  and 0.06 cm0.6 mm <br />6.0e-4 m <br /> (?) +
deciduous +
2-3(-4)-fid +
Carex sect. Oligocarpae +
Carex thornei +
Carex sect. Griseae +
species +
longest;16mm;32mm +
0.19 cm1.9 mm <br />0.0019 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
plant +  and cespitose +
2.1mm +  and 4mm +