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arctic wood rush

Donner wood rush

Rhizomes

horizontal, stout.

Culms

densely cespitose, 5-20 cm.

15–48 cm.

Leaves

sheaths brown to straw-colored;

basal leaves to 10 cm × 4 mm;

cauline leaves usually 2, reduced.

basal leaf sheaths bluish green;

basal leaves bluish green, abruptly tapered, less than 19 cm × 3–5 mm, apex long.

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.

with glomerules crowded at ends of uneven peduncles;

glomerules each with 3–12 flowers, central glomerules sessile or nearly sessile;

peduncles arching in all directions;

proximal inflorescence bract inconspicuous, 2–3 cm;

bracteoles clear, margins ciliate.

Flowers

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

anthers ± equaling filament length.

tepals pale to dark brown (apex acute), 1.5–2 mm, apex acute;

anthers ± equaling filament length.

Capsules

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

pale to dark brown-purple, shorter than tepals; (beak short).

Seeds

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

brown, oblong-ovoid, 1.1–1.2 mm;

caruncle absent.

2n

= 24.

= 24.

Luzula arctica

Luzula subcongesta

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 to subalpine moist or wet places
Elevation 0-1200 m (0-3900 ft) 2000–3500 m (6600–11500 ft)
Distribution
from FNA
AK; BC; LB; MB; NT; NU; QC; YT; Greenland; Eurasia
from FNA
CA; OR
[BONAP county map]
Discussion

Luzula subcongesta has bluish green basal leaves, tapered abruptly to the long apex.

(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. spicata, L. subcapitata, L. wahlenbergii
Synonyms L. nivalis L. spadicea var. subcongesta
Name authority Blytt: in M. N. Blytt and A. G. Blytt, Norges Flora 1: 299. (1861) (S. Watson) Jepson: Flora of California 1: 258, fig. 45. (1921)
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