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Wahlenberg's wood rush

alpine woodrush, heath wood rush, Sierra woodrush

Rhizomes

short.

Culms

cespitose, 15–30(–35) cm.

densely cespitose, stiffly erect, reddish brown, 3–26 cm.

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 reddish, 2.5–7 cm × 2–5 mm, firm, apex callous, glabrous.

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.

pyramidal, 5–10 mm wide;

glomerules 1–5, sessile, sometimes with 1–2 smaller glomerules on short peduncles;

proximal inflorescence bract conspicuous, reddish, usually exceeding inflorescence, generally stiff;

bracteoles clear.

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 very dark with clear margins, 2–3 mm;

outer whorl slightly exceeding inner whorl;

anthers ± equaling filaments.

Capsules

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

beak absent.

dark brown to black in distal portion, much shorter than tepals; (beak 0.3 mm).

Seeds

dark reddish brown, cylindric, 1.2–1.6 mm;

caruncle essentially absent.

dark brown, oval, 0.8 mm;

caruncle about 0.2 mm.

2n

= 24.

= 20, 22.

Luzula wahlenbergii

Luzula orestera

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 Alpine and subalpine meadows, fell-fields
Elevation 40–600 m (100–2000 ft) 2700–3600 m (8900–11800 ft)
Distribution
from FNA
AK; BC; MB; NT; NU; QC; YT; Greenland; Eurasia
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

The culms of Luzula orestera are reddish brown and stiffly erect; basal leaves are reddish, firm, and glabrous with an overlapping arrangement.

(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. groenlandica, L. hitchcockii, L. kjellmaniana, L. luzuloides, L. multiflora, L. pallidula, L. parviflora, L. piperi, L. rufescens, L. spicata, L. subcapitata, L. subcongesta, L. wahlenbergii
Synonyms L. campestris var. congesta, L. campestris var. sudetica
Name authority Ruprecht: Fl. Samojed. Cisural. 58. (1845) Sharsmith: Aliso 4: 125. (1958)
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