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arctic wood rush

common wood-rush, many-flower wood-rush

Culms

densely cespitose, 5-20 cm.

densely to loosely cespitose, 10–40 cm.

Leaves

sheaths brown to straw-colored;

basal leaves to 10 cm × 4 mm;

cauline leaves usually 2, reduced.

basal leaves 3.5–12 cm × 2–6 mm;

cauline leaves equaling or exceeding inflorescences.

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 3–16 (each with 8–16 flowers), 1–2 nearly sessile with others on evident peduncles, mostly cylindric;

secondary branches sometimes present, usually straight, erect;

proximal inflorescence bract barely as long as to exceeding inflorescence.

Flowers

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

anthers ± equaling filament length.

tepals pale brown to chestnut brown to blackish with clear margins, 2–4 mm;

outer and inner whorl ± equal, or outer whorl slightly longer (outer whorl pointed, inner whorl pointed or truncate-mucronate);

anthers not more than 2 times filament length;

stigmas 0.8–1.5 mm;

styles not persistent in fruit.

Capsules

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

pale to brown to black, globose, shorter than to ± equaling tepals.

Seeds

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

1.1–1.7 mm;

caruncles 0.2–0.6 mm.

2n

= 24.

Luzula arctica

Luzula multiflora

Phenology Flowering and fruiting summer.
Habitat Wet, stony places on slopes and in dwarf shrub heaths in alpine and arctic tundra; circumpolar.
Elevation 0-1200 m (0-3900 ft)
Distribution
from FNA
AK; BC; LB; MB; NT; NU; QC; YT; Greenland; Eurasia
from FNA
AK; CT; DC; DE; GA; IA; ID; IL; IN; KY; MA; MD; ME; MI; MN; MO; MT; NC; NH; NJ; NY; OH; OR; PA; RI; SD; TN; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NL; NS; NT; NU; ON; PE; QC; SK; YT; Eurasia
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[BONAP county map]
Discussion

Many names have been applied to members of this variable complex throughout the range of this flora. No monograph is yet available to enable a satisfactory treatment.

Subspecies 6 (3 in the flora).

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

Key
1. Tepals of outer and inner whorls not similar, outer whorl pointed, inner whorl truncate-mucronate; dark brown to chestnut to blackish
subsp. frigida
1. Tepals of outer and inner whorls similar, pointed, straw-colored to chestnut.
→ 2
2. Tepals straw-colored to brown; cauline leaves not or only barely overlapping; proximal inflorescence bract equal to or barely exceeding inflorescence
subsp. multiflora
2. Tepals chestnut; cauline leaves greatly overlapping; proximal inflorescence bract well exceeding inflorescence
subsp. kobayasii
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. orestera, L. pallidula, L. parviflora, L. piperi, L. rufescens, L. spicata, L. subcapitata, L. subcongesta, L. wahlenbergii
Subordinate taxa
L. multiflora subsp. frigida, L. multiflora subsp. kobayasii, L. multiflora subsp. multiflora
Synonyms L. nivalis Juncus. multiflorus, Juncus. campestris var. multiflorus
Name authority Blytt: in M. N. Blytt and A. G. Blytt, Norges Flora 1: 299. (1861) (Ehrhart) Lejeune: Flore des Environs de Spa 1: 169. (1811)
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