Carex distans

Linnaeus

Syst. Nat. ed. 10, 2: 1263. 1759.

IntroducedIllustrated
Treatment appears in FNA Volume 23. Treatment on page 522. Mentioned on page 521.

Culms 40–80 cm. Leaves: basal sheaths brown to orangebrown; blades of flowering-stems mostly basal, gray-green, flat, shorter than stems, widest blades 3–4.6 mm wide, margins scabrous. Inflorescences: longer peduncle of terminal spike 2–5 (–8.5) cm; proximal bract shorter than inflorescence; pistillate spikes 2–4, ascending, widely separated from staminate spike, pedunculate, ovoid to short-cylindric; terminal staminate spike (15–) 20–32 (–40) × 2–2.5 mm. Pistillate scales brown, with green or whitish, 3-veined midrib. Staminate scales brown, ovate-elliptic, margins scarious, apex obtuse or apiculate. Anthers 2.5–3.5 mm. Perigynia grayish green to greenish brown, 3.5–4.6 × 1.1–1.4 mm, apex contracted; beak (0.8–) 1–1.4 mm, scabrous. 2n = 68, 70–72, 74.


Phenology: Fruiting late Jun–Jul.
Habitat: Damp meadows, ballast near coasts
Elevation: 0–50 m

Distribution

V23 976-distribution-map.jpg

Introduced; Md., Pa., Eurasia

Discussion

Carex distans is an extremely rare adventive in North America, known only from two stations, an old one from Philadelphia and a 1948 collection from Charles County, Maryland. The latter site should be searched to determine if the species is still a part of the North American flora.

Carex fuscula d’Urville var. distenda (Kunth) Kükenthal [C. distenda Kunth] has apparently been collected once as a waif more than a century ago near Philadelphia, Pennsylvania. It would key more or less to C. distans, at least with perigynium characters, but differs in having the pistillate spikes aggregated around the base of the staminate spike.

In Europe, Carex distans has 36 or 37 pairs of chromosomes (A. O. Chater 1980; E. W. Davies 1955; M. Luceno et al. 1987; A. Strid and R. Franzen 1981).

Selected References

None.

Lower Taxa

None.

... more about "Carex distans"
74 +, 70 +  and 72 +
trigonous +
smaller +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
William J. Crins +  and A. A. Reznicek +
Linnaeus +
shortened +
brown;orangebrown +
cuneate +
Spirostachyae +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
bidentate +
0.1 cm1 mm <br />0.001 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
v--shaped +  and septate-nodulose +
0mm;20mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
round +  and trigonous +
40 cm400 mm <br />0.4 m <br /> (80 cm800 mm <br />0.8 m <br />) +
Md. +, Pa. +  and Eurasia +
0–50 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Damp meadows, ballast near coasts +
pedunculate +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
5 cm50 mm <br />0.05 m <br /> (8.5 cm85 mm <br />0.085 m <br />) +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
whitish +  and green +
usually not longer +
with (1-)3-6(-30) bristles and/or scales +
grayish green +  and greenish brown +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.46 cm4.6 mm <br />0.0046 m <br />) +
spreading +  and ascending +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
Fruiting late Jun–Jul. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
long-sheathing +  and leaflike +
Syst. Nat. ed. +
adventitious +
staminate +  and pistillate +
basal +  and proximal +
ovate-elliptic +
cylindric +
Introduced +  and Illustrated +
staminate +, pedunculate +  and pistillate +
ovoid;short-cylindric +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
deciduous +
2-3(-4)-fid +
Carex distans +
Carex sect. Spirostachyae +
species +
3.2 cm32 mm <br />0.032 m <br /> (4 cm40 mm <br />0.04 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
plant +  and cespitose +
3mm +  and 4.6mm +