Luzula arctica |
Luzula groenlandica |
|
---|---|---|
arctic wood rush |
Greenland wood rush |
|
Culms | densely cespitose, 5-20 cm. |
cespitose, straight, 10–30 cm, stiff. |
Leaves | sheaths brown to straw-colored; basal leaves to 10 cm × 4 mm; cauline leaves usually 2, reduced. |
basal leaves (with several outer dead ones usually present), to 9 cm × 3 mm, apex callous, sparingly pilose; cauline leaves to 5 cm × 2 mm. |
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. |
glomerules 1(–3); peduncles, not exceeding 5 mm; proximal inflorescence bract conspicuous, leaflike, usually conspicuously exceeding inflorescence; bracts mostly inconspicuous; bracteoles clear or light to dark brown, occasionally to 1/2 tepal length. |
Flowers | tepals deep brown with narrow clear margins and apex, 1.7-2.1 mm; anthers ± equaling filament length. |
tepals with broad clear margins and apex (apex acute-acuminate), 1.9–2.5 mm, apex acute-acuminate; outer whorl ± equaling to exceeding inner whorl; anthers ± equaling filaments. |
Capsules | dark reddish to blackish, shining, spheric, 1.8-2.1 mm, usually exceeding tepals. |
dark reddish, shining, ovoid, generally shorter than tepals. |
Seeds | translucent, clear brown, broadly elliptic, with few entangled hairs, 1-1.2 mm. |
translucent, brown, ellipsoid, 0.9–1.1 mm; caruncle barely visible. |
2n | = 24. |
= 24. |
Luzula arctica |
Luzula groenlandica |
|
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. | Sandy sea shores with herbaceous vegetation to turfy tundra, often by water, to alpine flats |
Elevation | 0-1200 m (0-3900 ft) | 0–400 m (0–1300 ft) |
Distribution |
AK; BC; LB; MB; NT; NU; QC; YT; Greenland; Eurasia |
AK; BC; LB; MB; NT; NU; QC; YT; Greenland |
Discussion | The culms of Luzula groenlandica are straight and stiff; basal leaves are sparingly pilose. (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 | |
Name authority | Blytt: in M. N. Blytt and A. G. Blytt, Norges Flora 1: 299. (1861) | Böcher: Meddelelser om Gronland 147: 18. (1950) |
Web links |