Luzula arctica |
Luzula subcongesta |
|
---|---|---|
arctic wood rush |
Donner wood rush |
|
Rhizomes | horizontal, stout. |
|
Culms | densely cespitose, 5-20 cm. |
15–48 cm. |
Leaves | sheaths brown to straw-colored; basal leaves to 10 cm × 4 mm; cauline leaves usually 2, reduced. |
basal leaf sheaths bluish green; basal leaves bluish green, abruptly tapered, less than 19 cm × 3–5 mm, apex long. |
Inflorescences | glomerules 1-3, sessile; proximal inflorescence bract inconspicuous, brown, much shorter to ± equaling inflorescence, apex often clear, dentate; bracts deep brown, margins dentate; bracteoles deep brown, margins dentate. |
with glomerules crowded at ends of uneven peduncles; glomerules each with 3–12 flowers, central glomerules sessile or nearly sessile; peduncles arching in all directions; proximal inflorescence bract inconspicuous, 2–3 cm; bracteoles clear, margins ciliate. |
Flowers | tepals deep brown with narrow clear margins and apex, 1.7-2.1 mm; anthers ± equaling filament length. |
tepals pale to dark brown (apex acute), 1.5–2 mm, apex acute; anthers ± equaling filament length. |
Capsules | dark reddish to blackish, shining, spheric, 1.8-2.1 mm, usually exceeding tepals. |
pale to dark brown-purple, shorter than tepals; (beak short). |
Seeds | translucent, clear brown, broadly elliptic, with few entangled hairs, 1-1.2 mm. |
brown, oblong-ovoid, 1.1–1.2 mm; caruncle absent. |
2n | = 24. |
= 24. |
Luzula arctica |
Luzula subcongesta |
|
Phenology | Flowering and fruiting summer. | Flowering and fruiting summer. |
Habitat | Wet, stony places on slopes and in dwarf shrub heaths in alpine and arctic tundra; circumpolar. | Alpine to subalpine moist or wet places |
Elevation | 0-1200 m (0-3900 ft) | 2000–3500 m (6600–11500 ft) |
Distribution |
AK; BC; LB; MB; NT; NU; QC; YT; Greenland; Eurasia |
CA; OR |
Discussion | Luzula subcongesta has bluish green basal leaves, tapered abruptly to the long apex. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 22, p. 263. | FNA vol. 22. |
Parent taxa | Juncaceae > Luzula > subg. Luzula | Juncaceae > Luzula > subg. Luzula |
Sibling taxa | ||
Synonyms | L. nivalis | L. spadicea var. subcongesta |
Name authority | Blytt: in M. N. Blytt and A. G. Blytt, Norges Flora 1: 299. (1861) | (S. Watson) Jepson: Flora of California 1: 258, fig. 45. (1921) |
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