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kobrésie simple, simple bog sedge, simple kobresia

Siberian bog sedge, Siberian kobresia

Culms

5–35 cm.

5–40 cm.

Leaves

basal sheaths dull, base of blade usually persistent;

blades ± channeled, 2–20 cm × 0.2–1.5(–2) mm.

basal sheaths somewhat glossy, bladeless;

blades filiform, 2–15 cm × 0.25–0.5 mm.

Inflorescences

usually compound, (8–) 10–35 × (2–)3–8 mm;

bracts brown, margins hyaline, ovate to oblong-ovate;

proximal spikelets 1-flowered and pistillate or 2-flowered and androgynous;

terminal and distal spikelets 1-flowered, staminate.

simple, 10–20 × 4–8 mm;

proximal spikelets usually androgynous with 1–2 staminate flowers, 1 pistillate flower, and 1–3 scales;

distal spikelets staminate, 1-flowered.

Perigynia

brown, 2.5–3.2 mm, margins free to base, smooth.

brown, finely veined, 3.5–5.5 mm, margins connate near base.

Achenes

2–3 mm.

2.6–4 mm.

Scales

brown, ovate, 2–3 mm, margins hyaline, midvein distinct almost to tip, apex obtuse to subacute.

brown, obovate-circular, 3.5–5.5 mm, midvein distinct only near base, margins hyaline, apex obtuse.

Anthers

1–2 mm.

2–3 mm.

2n

= 70–75.

Kobresia simpliciuscula

Kobresia sibirica

Phenology Fruiting summer. Fruiting summer.
Habitat Fens, marshes, mesic to wet tundra, gravels, rocky slopes, usually on calcareous substrates Dry to mesic tundra
Elevation 0–3500 m (0–11500 ft) 0–3600 m (0–11800 ft)
Distribution
from FNA
AK; CO; ID; OR; UT; WY; AB; BC; MB; NL; NT; NU; ON; QC; YT; Greenland; Eurasia
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; CO; WY; NT; NU; YT; c Asia; n Asia
[BONAP county map]
Discussion

Kobresia sibirica, a local and variable species, is not yet fully understood. Some authors consider K. hyperborea and K. macrocarpa to be distinct endemic North American species; other authors include those and K. sibirica in the southwest Asian species K. schoenoides (C. A. Meyer) Steudel. In the Asian plants, the androgynous spikelets are reported as having 3 staminate flowers and no sterile scales.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 23, p. 252. FNA vol. 23, p. 253.
Parent taxa Cyperaceae > Kobresia Cyperaceae > Kobresia
Sibling taxa
K. myosuroides, K. sibirica
K. myosuroides, K. simpliciuscula
Synonyms Carex simpliciuscula Elyna sibirica, K. hyperborea, K. macrocarpa
Name authority (Wahlenberg) Mackenzie: Bull. Torrey Bot. Club 50: 349. (1923) (Turczaninow ex Ledebour) Boeckeler: Linnaea 39: 7. (1875)
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