Compilation
Carex rotundata

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Name

Identification
Carex compacta (R.Br.) Poir. [family CYPERACEAE ] Carex membranacea Hook. [family CYPERACEAE ] (stored under name); Verified by Bruce Austin Ford, Carex rotundata Wahlenb. [family CYPERACEAE ] Verified by Bruce Austin Ford,
Related name
  • Carex saxatilis
  • Carex pulla
  • Carex indet.
  • Carex rotundata
  • Carex membranacea
  • Carex melozitnensis
  • Carex compacta
  • Carex sp.
Common name
  • Carex à fruits ronds, Flora of North America Vol. 23

Flora

Entry for Carex rotundata Wahlenberg [family CYPERACEAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 23,
Names
Carex rotundata Wahlenberg [family CYPERACEAE], Kongl. Vetensk. Acad. Nya Handl., 24: 153. 1803
Carex melozitnensis A. E. Porsild [family CYPERACEAE]
Treatment Author(s)
Peter W. Ball
A. A. Reznicek
Information
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
summer
aug
Altitude range
0–900 m;
Distribution
Eurasia.USA AlaskaCanada Man.Canada Nfld. and Labr.Canada N.W.T.Canada Que.Canada Yukon
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).

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