(lapland reedgrass)Select an option below for more information on this species
is a tall, loosely tufted perennial grass with narrow panicles, found most commonly in heaths and shrub tundra from uplands into the subalpine zone in Denali (most frequently north of the Alaska Range crest). Plants grow up to 1 m tall from subterranean runners. Leaves are flat, 5-15 cm long, scabrous, and narrow (2-4 mm). Ligules
are membranous, 1.5-4 mm long with entire
margins. The stem typically only has 2 or 3 nodes
. The inflorescence
is a loose panicle, 5-15 cm long, 1.5m wide, and sometimes becomes purplish-brown with age. The spikelets
have one bisexual flower. Glumes
are long (4-5.5 mm) and narrow (at least 3x longer than broad) with an acute tip. Lemmas
are slightly shorter than glumes
(3.5-5 mm) with a short awn
. The characteristic callus
hairs are numerous and of equal length to the lemma
. The fruit is single-seeded, indehiscent and dry. This plant can be distinguished from other local Calamagrostis
species by the long, narrow panicle and the narrow glumes
, more than 3 longer than they are broad.
Calamagrostis lapponica greens up in early summer (late May-June) and produces flowers in mid to late summer (July-August).
, with stamens
in the same florets (bisexual). Flowers are wind pollinated. Seeds are wind and gravity dispersed. It also readily spreads vegetatively through runners.
Calamagrostis lapponica is a circumpolar species with an arctic-alpine distribution that ranges across northern Eurasia, Alaska, across all Canadian provinces and Greenland to Europe. In Alaska this species occurs occasionally statewide except apparently is absent along the southern coastal areas and in the Yukon-Kuskokwim delta region. In Denali, C. lapponica occurs primarily in the mountains north of the Alaska Range with a few localities in the vicinity of Broad Pass to the south.
Details are shown in the Plots & Charts found at right, depicting recent Denali data.
C. lapponica is found in the park at elevations from 314 m to 1227 m with an average site elevation of 824 m. It appears to slightly prefer north-facing slopes. It is found on sites with a wide range of slope angles (1-35 degrees) with an average angle of 9 degrees.
Details are shown in the Plots & Charts found at right. For more on how to interpret these figures, visit Understanding Data Presented.
C. lapponica grows in sandy soils in the mountains. Soil pH of sites where C. lapponica grew ranged from 3.8 to 6.3 with an average value of 4.6.
Occurs in moist to well-drained areas.
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