Carex nigra; The Common Sedge is a very common sedge growing on wet soils and along rivers and streams in all regions of Iceland. It is a rather variable species, plants ranging form 20 to 80 cm. The top spike has the male flowers. After blooming it turns brownish. The female spikes (two to four) are based on short stalks on the upper half of the stem. They are cylindrically shaped and the utricles are light-green with blackish bracts or black all together. The utricles are lens-shaped (characteristic of 2-styled flowers).
It is a member of the sedge family (Cyperaceae). The Icelandic name of this species is Mýrastör.