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Wahlenberg's wood rush

Rhizomes

short.

Culms

cespitose, 15–30(–35) 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.

apex generally not callous.

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.

paniculate or dichasial.

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.

in pairs, rarely in clusters of 3–4 or solitary.

Capsules

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

beak absent.

Seeds

dark reddish brown, cylindric, 1.2–1.6 mm;

caruncle essentially absent.

micropylar end with tuft of hairs;

caruncle barely visible or absent.

2n

= 24.

Luzula wahlenbergii

Luzula subg. Anthelaea

Phenology Flowering and fruiting late summer.
Habitat Wet mossy arctic and alpine tundra, lake shores, alluvial rivers, shores of alpine creeks, gneissic seashores
Elevation 40–600 m (100–2000 ft)
Distribution
from FNA
AK; BC; MB; NT; NU; QC; YT; Greenland; Eurasia
[BONAP county map]
Northern Hemisphere
Discussion

Species 20+ ca. 50 (6 in the flora).

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

Key
1. Tepals whitish to pinkish
subsp. luzuloides
1. Tepals straw-colored to dark brown.
→ 2
2. Apex of tepals long-acuminate, reflexed; inflorescence branches widely spreading to 90°, stiff
L. divaricata
2. Apex of tepals acute, not reflexed; inflorescence branches spreading less than 90°, lax.
→ 3
3. Tepals 2.5–3.5 mm; capsule ± equaling tepal length, ovoid, distinct beak to 1 mm
L. hitchcockii
3. Tepals 2.5 mm or shorter; capsule shorter than 2.5 mm, never ovoid, distinct beak absent.
→ 4
4. Culms commonly (20–)30–100 cm; margins of inflorescence bracts and bracteoles entire to lacerate
L. parviflora
4. Culms commonly less than 30 cm; margins of inflorescence bracts and bracteoles ciliate.
→ 5
5. Proximal inflorescence bract to 1 cm; stigmas 2 times style length; seeds dark reddish brown
L. wahlenbergii
5. Proximal inflorescence bract 0.8–1.5 cm; stigmas 5 times style length; seeds light yellow-brown
L. piperi
Source FNA vol. 22. FNA vol. 22.
Parent taxa Juncaceae > Luzula > subg. Anthelaea Juncaceae > 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
Subordinate taxa
L. divaricata, L. hitchcockii, L. parviflora, L. piperi, L. wahlenbergii, subsp. luzuloides
Synonyms L. section Anthelaea
Name authority Ruprecht: Fl. Samojed. Cisural. 58. (1845) (Grisebach) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 76, 86. (1890)
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