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Wahlenberg's wood rush

bulbous wood rush

Rhizomes

short.

short, slender, bearing few to several white, swollen (storage) leaf bases.

Culms

cespitose, 15–30(–35) cm.

weakly cespitose or solitary, 8–40 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 few;

cauline leaves 2–3, to 17 cm × 7 mm, margins scarcely to densely ciliate.

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 3–20 (each with 6–20 flowers), central glomerules sessile or nearly sessile, cylindric, 5–12 × 5–7 mm;

peduncles straight, erect, 0.5–7 cm;

proximal inflorescence bract leaflike (margins pilose), shorter than inflorescence, margins pilose;

bracts purplish with long clear apex, sheathing, margins sparsely to densely ciliate;

bracteoles white-clear, shining, margins fimbriate.

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 shining chestnut centers and usually wide clear margins and apex, 2–3 mm;

outer whorl usually exceeding inner whorl, at least by awned tip;

anthers 1–2 times filament length;

stigmas 3–4 times length of styles.

Capsules

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

beak absent.

brown, shining, obovoid (apex truncate), equal or longer than tepals, apex truncate.

Seeds

dark reddish brown, cylindric, 1.2–1.6 mm;

caruncle essentially absent.

dark brown, ellipsoid, 0.9–1.3 mm;

caruncle 0.5–0.7 mm.

2n

= 24.

= 12.

Luzula wahlenbergii

Luzula bulbosa

Phenology Flowering and fruiting late summer. Flowering and fruiting spring–early summer.
Habitat Wet mossy arctic and alpine tundra, lake shores, alluvial rivers, shores of alpine creeks, gneissic seashores Dry situations in woods and fields 50–600 m
Elevation 40–600 m (100–2000 ft)
Distribution
from FNA
AK; BC; MB; NT; NU; QC; YT; Greenland; Eurasia
[BONAP county map]
from FNA
AL; AR; CT; DC; DE; FL; GA; IL; IN; KS; KY; LA; MA; MD; MO; MS; NC; NJ; NY; OH; OK; PA; SC; TN; TX; VA; WV
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[BONAP county map]
Discussion

Luzula bulbosa has slender rhizomes that bear few to several white, swollen (storage) leaf bases; cauline leaves (numbering 2–3) have scarcely to densely ciliate margins; flowers have stigmas 3–4 times the length of the styles.

(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. 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. wahlenbergii
Synonyms L. campestris var. bulbosa
Name authority Ruprecht: Fl. Samojed. Cisural. 58. (1845) (A. Wood) B. B. Rydberg: Brittonia 1: 85. 1931Smyth, B. B. & L. C. R. Smyth, Trans. Kansas A
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