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arctic wood rush

spike wood-rush

Culms

densely cespitose, 5-20 cm.

densely cespitose, reddish, 3–33 cm, base thick, extending 1–8 cm into soil.

Leaves

sheaths brown to straw-colored;

basal leaves to 10 cm × 4 mm;

cauline leaves usually 2, reduced.

sheath throats densely hairy;

basal leaves erect, channeled, linear, 2–15 cm × 1–4 mm, apex not callous;

cauline leaves 2–3.

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.

panicles of dense, nodding, spikelike clusters (each 1–25 mm), often interrupted by 10–70 mm;

proximal inflorescence bract conspicuous, generally exceeding inflorescence;

bracts clear;

bracteoles clear, margins ciliate, apex narrow, extended.

Flowers

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

anthers ± equaling filament length.

tepals brown with clear margins or very pale throughout (outer whorl bristle-pointed), 2–2.5 mm;

outer whorl longer than inner whorl;

anthers ± equaling filaments.

Capsules

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

pale to dark brown or blackish, round (apex ± acute), generally shorter than tepals, apex ± acute.

Seeds

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

brown, cylindric-ovoid, body 1–1.2 mm;

caruncle 0.2 mm.

2n

= 24.

= 24.

Luzula arctica

Luzula spicata

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. Alpine slopes and heaths, dry or damp situations among grasses, herbs, or lichens, and in subalpine forests
Elevation 0-1200 m (0-3900 ft) 0–3700 m (0–12100 ft)
Distribution
from FNA
AK; BC; LB; MB; NT; NU; QC; YT; Greenland; Eurasia
from FNA
AK; CA; CO; ID; ME; MT; NH; NM; NV; NY; OR; UT; VT; WA; WY; AB; BC; MB; NL; NT; NU; QC; YT; SPM; Circumpolar; Greenland; Eurasia
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Discussion

The culms of Luzula spicata are thick and reddish with bases extending 1–8 cm into the soil; sheath throats are densely hairy; basal leaves are erect, linear, and channeled; inflorescence bracts are conspicuous and often exceed glomerules; and bracteoles have narrow and extended apices.

(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. groenlandica, L. hitchcockii, L. kjellmaniana, L. luzuloides, L. multiflora, L. orestera, L. pallidula, L. parviflora, L. piperi, L. rufescens, L. subcapitata, L. subcongesta, L. wahlenbergii
Synonyms L. nivalis Juncus spicatus
Name authority Blytt: in M. N. Blytt and A. G. Blytt, Norges Flora 1: 299. (1861) (Linnaeus) de Candolle: in J. Lamarck and A. P. de Candolle, Fl. France, ed. 3 1: 161. (1805)
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