Flora of North America species comparison

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Luzula

Luzula subg. Pterodes

hairy wood rush, wood rush
Habit Herbs, perennial, usually cespitose, often with short, mostly vertical to running rhizomes and/or (less commonly) stolons.
Culms

round.

Cataphylls

absent.

Leaves

sheaths closed, without auricles at throat (junction with blade), usually pilose;

blade flat or channeled, never septate, margins with long, soft, multicellular hairs, apex often thickened (callous), veins commonly indistinct.

apex callous.
Inflorescences

terminal;

flowers inserted individually or in dense clusters (glomerules) variously arranged;

bracts subtending inflorescence (proximal inflorescence bracts) 2, mostly leaflike;

bracts subtending inflorescence branches 1–2, reduced;

bracteoles subtending flowers 2–3.

corymbose, simple or sparsely branched.
Flowers

tepals 6, in 2 whorls;

stamens 6.

solitary.
Capsules

1-locular, generally globose;

beak often formed by persistent style base.

Seeds

3, globose to ovoid, base often with tuft of fibrous hairs (vestige of funiculus);

nutritive appendage from outer seed coat (caruncle) often present, white, barely visible to ± equaling seed body.

base without tuft of hairs;

caruncle chalazal, conspicuous.
x

= 6.

Luzula

Luzula subg. Pterodes
Distribution
from USDA
Temperate and arctic regions worldwide; tropical mountains
[BONAP county map]
North America; Eurasia; e Africa
Discussion

The leaves of Luzula are primarily basal; cauline leaves are usually reduced.

Luzula species have diffuse centromeres and small chromosomes. That has resulted in much confusion in interpretation and reporting of chromosome counts. No attempt has been made to include reported counts that could not reasonably be verified by the author.

Excluded species: Luzula sudetica (Willdenow) de Candolle. Although reports of this European species appear frequently in the North American literature, I have seen no specimens that confirm its presence. No chromosome counts are published for North American material. Since this species has a distinct cytotype, 2n = 48 (H. Nordenskiöld 1956), it should not be difficult to verify on this basis.

Species ca. 108 (23 in the flora).

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

Species 8 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Flowers in dense clusters (glomerules); inflorescences spikelike or umbellate; seeds with caruncle conspicuous to barely visible
subg. Luzula
1. Flowers solitary or in small clusters of 2–4; inflorescences mostly unbranched or dichasial; seeds with caruncle conspicuous to absent.
→ 2
2. Flowers solitary; inflorescences corymbose, rarely branching; seeds with caruncle conspicuous
subg. Pterodes
2. Flowers mostly in pairs, rarely in clusters of 3–4, or solitary; inflorescences paniculate or dichasial; seeds with caruncle inconspicuous or absent
subg. Anthelaea
1. Tepals 1.6–2.5 mm; inflorescences rarely branching; pedicels spreading
L. rufescens
1. Tepals 3–4.5 mm; inflorescences not branching or often branching; pedicels mostly erect to spreading.
L. acuminata
Source FNA vol. 22, p. 255. Author: Janice Coffey Swab. FNA vol. 22.
Parent taxa Juncaceae Juncaceae > Luzula
Subordinate taxa
L. subg. Anthelaea, L. subg. Luzula, L. subg. Pterodes
L. acuminata, L. rufescens
Synonyms Juncoides L. section Pterodes
Name authority de Candolle: in J. Lamarck and A. P. de Candolle, Fl. France, ed. 3 1: 198; 3: 158. (1805) (Grisebach) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 12: 76. (1890)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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