About Juncus castaneus Sm.
Juncus castaneus Sm. is a rush species with the common name chestnut rush. It has a circumboreal, or circumpolar, distribution across the northern latitudes of the Northern Hemisphere, and occurs in Europe, Asia, and North America. In North America, it grows from Alaska to Greenland; its range covers all of Canada and extends south through the Rocky Mountains into the contiguous United States. It is widespread and common in the Canadian Arctic Archipelago. This is a perennial plant that grows stems up to 50 centimeters tall, produced singly or in pairs from a rhizome. It has a small number of leaves, with the longest basal leaves reaching up to 20 centimeters in length. It produces between one and five flower heads, each of which holds up to 10 to 12 flowers. Each flower has 3 brown tepals and 6 stamens. Its fruit is a dry, dark brown or chestnut-colored capsule. Its seeds are a few millimeters long, including their long tail. The plant reproduces both by seed and by rhizome. This species grows in Arctic habitat types, and farther south it grows on high mountains with alpine climates. It grows in wet habitats such as streambanks, bogs, and seeps.
