This is a perennial plant 30-120 cm tall, with erect stems branching at whorls.
It is common in low moors, along shorelines, and often in the water, growing in dense colonies. The spores are produced in June-July.
/ * The photos at lake.peipsi.org are cross-posted from commons.wikimedia.org and are used for familiarization purposes only. No commercial use of the photos is allowed. For more information about to use the photos see the originals on commons.wikimedia.org. /
