Luzula parviflora
Encyclopedia
Luzula parviflora is a species of flowering plant in the rush family
Juncaceae
Juncaceae, the rush family, are a monocotyledonous family of flowering plants. There are eight genera and about 400 species. Members of the Juncaceae are slow-growing, rhizomatous, herbaceous plants, and they may superficially resemble grasses. They often grow on infertile soils in a wide range...

 known by the common name small-flowered woodrush. It has a circumboreal distribution
Circumboreal Region
The Circumboreal Region is a floristic region within the Holarctic Kingdom in Eurasia and North America, as delineated by such geobotanists as Josias Braun-Blanquet and Armen Takhtajan....

, occurring throughout the northern Northern Hemisphere in Europe, Asia, and North America. It grows in moist areas, often in gravelly soils. It occurs at low elevations in colder regions, such as tundra
Tundra
In physical geography, tundra is a biome where the tree growth is hindered by low temperatures and short growing seasons. The term tundra comes through Russian тундра from the Kildin Sami word tūndâr "uplands," "treeless mountain tract." There are three types of tundra: Arctic tundra, alpine...

; farther south it is restricted mainly to high mountains. It can grow in highly disturbed habitat, as evidenced by its ability to survive volcanic eruption
Plinian eruption
Plinian eruptions, also known as 'Vesuvian eruptions', are volcanic eruptions marked by their similarity to the eruption of Mount Vesuvius in AD 79 ....

 and to thrive in the destroyed ecosystem on the most barren slopes of Mount St. Helens
Mount St. Helens
Mount St. Helens is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States. It is south of Seattle, Washington and northeast of Portland, Oregon. Mount St. Helens takes its English name from the British diplomat Lord St Helens, a...

. It is a perennial herb forming grasslike clumps of several erect stems up to half a meter in maximum height surrounded by many grasslike leaves. The inflorescence
Inflorescence
An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Strictly, it is the part of the shoot of seed plants where flowers are formed and which is accordingly modified...

is an open array of many clusters of brown flowers on long branches.

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