Carex rotundata

Wahlenberg

Kongl. Vetensk. Acad. Nya Handl. 24: 153. 1803.

Common names: Carex à fruits ronds
Illustrated
Synonyms: Carex melozitnensis A. E. Porsild
Treatment appears in FNA Volume 23. Treatment on page 504. Mentioned on page 500, 502, 507.

Plants cespitose; rhizomes long. Culms round in cross-section, 17–48 cm, smooth distally. Leaves: basal sheaths brown, rarely red tinged; ligules shorter than wide; blades mid to dark green, wiry, filiform-involute, circular in cross-section, 1.3–3 (–3.2) mm wide, glabrous. Inflorescences 2–14 cm; proximal bract 0.7–10 (–16) cm, shorter than or equaling inflorescence; proximal 1–2 (–3) spikes pistillate, erect; terminal 1–2 (–3) spikes staminate. Pistillate scales ovate, 2.4–4 × 1.3–2.1 mm, as long as or shorter than perigynia, margins entire, apex obtuse or acute, awnless. Perigynia spreading to reflexed, obscurely few-veined, veins not extending to beak, elliptic, 2.5–3.9 (–4.2) × 1.4–2.3 mm, apex abruptly contracted, membranaceous; beak 0.4–0.8 (–0.9) mm, obscurely bidentulate, smooth, teeth straight, to 0.3 mm. Stigmas 3. Achenes yellow, trigonous, smooth. 2n = 80.


Phenology: Fruiting Jul–Aug.
Habitat: Fens, bogs, wet tundra
Elevation: 0–900 m

Distribution

V23 936-distribution-map.jpg

Man., Nfld. and Labr., N.W.T., Que., Yukon, Alaska, Eurasia

Discussion

Hybrids between Carex rotundata and C. utriculata (= C. ×paludivagans Drury) are known from the Kuskokwim River Valley and Kenai Peninsula of Alaska (W. H. Drury Jr. 1956b; B. A. Ford et al. 1993). Althouth the hybrids can produce hardened achenes, the pollen is sterile. Hybrid plants are intermediate morphologically between the putative parents and possess no unique characters that distinguish them as distinct taxonomic entities (B. A. Ford et al. 1993).

Selected References

None.

Lower Taxa

None.

... more about "Carex rotundata"
trigonous +
not papillose +
membranaceous +
A. A. Reznicek +  and Bruce A. Ford +
Wahlenberg +
shortened +
red tinged;brown +
not +  and fibrous +
truncate +  and rounded +
Vesicariae +
bidentulate +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
emarginate +  and bidentate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
round +, w--shaped +  and septate-nodulose +
filiform-involute +
0mm;20mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
scale-like +  and leaflike +
parallel +  and divergent +
terete +, rolled +  and plicate +
Carex à fruits ronds +
1.3mm +  and 3mm +
brown +, reddish-brown +  and reddish purple +
17 cm170 mm <br />0.17 m <br /> (48 cm480 mm <br />0.48 m <br />) +
Man. +, Nfld. and Labr. +, N.W.T. +, Que. +, Yukon +, Alaska +  and Eurasia +
0–900 m +
open +, pistillate +  and staminate +
hypogynous +  and subtending +
biconvex +  and trigonous +
Fens, bogs, wet tundra +
2 cm20 mm <br />0.02 m <br /> (14 cm140 mm <br />0.14 m <br />) +
prophyllate +, pedunculate +  and pistillate +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
basal +  and cauline +
with (1-)3-6(-30) bristles and/or scales +
spreading +  and reflexed +
0.2 cm2 mm <br />0.002 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Fruiting Jul–Aug. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
short-sheathed +, sheathless +  and leaflike +
10 cm100 mm <br />0.1 m <br /> (16 cm160 mm <br />0.16 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Kongl. Vetensk. Acad. Nya Handl. +
adventitious +
green +  and dark-brown +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
basal +  and proximal +
1.3mm;2.1mm +
septate-nodulose +
Illustrated +
staminate +  and pistillate +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
persistent +
2-3(-4)-fid +
Carex melozitnensis +
Carex rotundata +
Carex sect. Vesicariae +
species +
straight +
0 cm0 mm <br />0 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
0.39 cm3.9 mm <br />0.0039 m <br /> (0.42 cm4.2 mm <br />0.0042 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.39 cm3.9 mm <br />0.0039 m <br />) +
1.4mm +  and 2.3mm +
plant +  and cespitose +