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fork wood rush

Greenland wood rush

Rhizomes

thick.

Culms

densely cespitose, reddish, 6–30 cm × 2 mm.

cespitose, straight, 10–30 cm, stiff.

Leaves

basal leaves numerous, blade to 20 cm × 4–6 mm, sometimes longer than stem, apex long-pointed to 12 mm, mostly glabrous;

cauline leaves 2–3.

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

5–15 cm, width 1/2 to equaling length;

branches widely spreading to 90°, stiff, not drooping;

proximal bract inconspicuous, less than 2 cm;

bracts and bracteoles clear, margins slightly lacerate, often with a few cilia.

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

solitary;

tepals pale brown with reddish tint, 1.8–2.4 mm, apex reflexed, long-acuminate;

outer whorl slightly longer than inner whorl;

anthers ± equaling filaments;

stigmas 3 times style 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

deep reddish brown, shorter to slightly longer than tepals.

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

Seeds

light brown, 1.2 mm.

translucent, brown, ellipsoid, 0.9–1.1 mm;

caruncle barely visible.

2n

= 24.

Luzula divaricata

Luzula groenlandica

Phenology Flowering and fruiting summer. Flowering and fruiting summer.
Habitat Subalpine forest to alpine granitic slopes Sandy sea shores with herbaceous vegetation to turfy tundra, often by water, to alpine flats
Elevation 2100–3700 m (6900–12100 ft) 0–400 m (0–1300 ft)
Distribution
from FNA
CA; ID; NV; OR; WA
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[BONAP county map]
from FNA
AK; BC; LB; MB; NT; NU; QC; YT; Greenland
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Discussion

The culms of Luzula divaricata are reddish colored.

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

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. FNA vol. 22.
Parent taxa Juncaceae > Luzula > subg. Anthelaea Juncaceae > Luzula > subg. Luzula
Sibling taxa
L. acuminata, L. arctica, L. arcuata, L. bulbosa, L. campestris, L. comosa, L. confusa, 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
Name authority S. Watson: Proc. Amer. Acad. Arts 14:302. (1879) Böcher: Meddelelser om Gronland 147: 18. (1950)
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