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arctic wood rush

Greenland wood rush

Culms

densely cespitose, 5-20 cm.

cespitose, straight, 10–30 cm, stiff.

Leaves

sheaths brown to straw-colored;

basal leaves to 10 cm × 4 mm;

cauline leaves usually 2, reduced.

basal leaves (with several outer dead ones usually present), to 9 cm × 3 mm, apex callous, sparingly pilose;

cauline leaves to 5 cm × 2 mm.

Inflorescences

glomerules 1-3, sessile;

proximal inflorescence bract inconspicuous, brown, much shorter to ± equaling inflorescence, apex often clear, dentate;

bracts deep brown, margins dentate;

bracteoles deep brown, margins dentate.

glomerules 1(–3);

peduncles, not exceeding 5 mm;

proximal inflorescence bract conspicuous, leaflike, usually conspicuously exceeding inflorescence;

bracts mostly inconspicuous;

bracteoles clear or light to dark brown, occasionally to 1/2 tepal length.

Flowers

tepals deep brown with narrow clear margins and apex, 1.7-2.1 mm;

anthers ± equaling filament length.

tepals with broad clear margins and apex (apex acute-acuminate), 1.9–2.5 mm, apex acute-acuminate;

outer whorl ± equaling to exceeding inner whorl;

anthers ± equaling filaments.

Capsules

dark reddish to blackish, shining, spheric, 1.8-2.1 mm, usually exceeding tepals.

dark reddish, shining, ovoid, generally shorter than tepals.

Seeds

translucent, clear brown, broadly elliptic, with few entangled hairs, 1-1.2 mm.

translucent, brown, ellipsoid, 0.9–1.1 mm;

caruncle barely visible.

2n

= 24.

= 24.

Luzula arctica

Luzula groenlandica

Phenology Flowering and fruiting summer. Flowering and fruiting summer.
Habitat Wet, stony places on slopes and in dwarf shrub heaths in alpine and arctic tundra; circumpolar. Sandy sea shores with herbaceous vegetation to turfy tundra, often by water, to alpine flats
Elevation 0-1200 m (0-3900 ft) 0–400 m (0–1300 ft)
Distribution
from FNA
AK; BC; LB; MB; NT; NU; QC; YT; Greenland; Eurasia
from FNA
AK; BC; LB; MB; NT; NU; QC; YT; Greenland
[BONAP county map]
Discussion

The culms of Luzula groenlandica are straight and stiff; basal leaves are sparingly pilose.

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

Source FNA vol. 22, p. 263. FNA vol. 22.
Parent taxa Juncaceae > Luzula > subg. Luzula Juncaceae > Luzula > subg. Luzula
Sibling taxa
L. acuminata, L. arcuata, L. bulbosa, L. campestris, L. comosa, L. confusa, L. divaricata, L. echinata, L. groenlandica, L. hitchcockii, L. kjellmaniana, L. luzuloides, L. multiflora, L. orestera, L. pallidula, L. parviflora, L. piperi, L. rufescens, L. spicata, L. subcapitata, L. subcongesta, L. wahlenbergii
L. acuminata, L. arctica, L. arcuata, L. bulbosa, L. campestris, L. comosa, L. confusa, L. divaricata, L. echinata, L. hitchcockii, L. kjellmaniana, L. luzuloides, L. multiflora, L. orestera, L. pallidula, L. parviflora, L. piperi, L. rufescens, L. spicata, L. subcapitata, L. subcongesta, L. wahlenbergii
Synonyms L. nivalis
Name authority Blytt: in M. N. Blytt and A. G. Blytt, Norges Flora 1: 299. (1861) Böcher: Meddelelser om Gronland 147: 18. (1950)
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