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Wahlenberg's wood rush

Greenland wood rush

Rhizomes

short.

Culms

cespitose, 15–30(–35) cm.

cespitose, straight, 10–30 cm, stiff.

Leaves

sheath throat acutely angled, pilose;

basal leaf blade 5–10 cm × 3–8 mm, apex short acuminate, mostly glabrous;

cauline leaves (1–)2–4, 3–5 cm × 2–4 mm.

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

anthelate, few flowered;

main branches generally 2–4, spreading less than 90°, lax, usually arching;

proximal inflorescence bract 1 cm or less;

bracts and bracteoles brown;

margins with long curly 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 on short pedicels;

tepals dark purplish brown (margins finely lacerate toward apex), 2–2.5 mm, margins finely lacerate toward apex, apex acute, not reflexed;

anthers ± equaling filament length;

stigmas 2 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

dark brown, less than 2.5 mm, slightly longer than tepals;

beak absent.

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

Seeds

dark reddish brown, cylindric, 1.2–1.6 mm;

caruncle essentially absent.

translucent, brown, ellipsoid, 0.9–1.1 mm;

caruncle barely visible.

2n

= 24.

= 24.

Luzula wahlenbergii

Luzula groenlandica

Phenology Flowering and fruiting late summer. Flowering and fruiting summer.
Habitat Wet mossy arctic and alpine tundra, lake shores, alluvial rivers, shores of alpine creeks, gneissic seashores Sandy sea shores with herbaceous vegetation to turfy tundra, often by water, to alpine flats
Elevation 40–600 m (100–2000 ft) 0–400 m (0–1300 ft)
Distribution
from FNA
AK; BC; MB; NT; NU; QC; YT; Greenland; Eurasia
[BONAP county map]
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. 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. 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. 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 Ruprecht: Fl. Samojed. Cisural. 58. (1845) Böcher: Meddelelser om Gronland 147: 18. (1950)
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