West Highland Flora

Sharp-flowered Rush


Juncus acutiflorus

 

Juncus acutiflorus

Photo Carl Farmer
13 Oct 2002 Portree, Skye

Common on wet moorland

Tepals c 1.5-2.6 mm.  Stems c 40-120 cm high, typically as tall as Soft Rush.

ID: Leaves round or elliptical in cross-section, with darker horizontal lines visible against the light at intervals (see last pic below)  Difficult to separate from Jointed Rush, which has similar leaves, but the tepals are never as dark as in Jointed Rush, where they are almost blackish-brown, and the main branches are often almost horizontal (i.e. at right-angles to the stem)

Other features: Forms dense stands.  Inflorescence repeatedly branched, the branches spreading at wide angles.  Hybridises with the smaller Jointed Rush, but tall upright specimens with straight leaves almost round in cross-section can be confidently identified. The ripe fruit protrudes well beyond the tepals, while in the hybrid it hardly protrudes at all.

Hybrids with Jointed Rush occur and some of these photos may be the hybrid.

 

Juncus acutiflorus

Photo Carl Farmer
13 Oct 2002 Portree, Skye

  Juncus acutiflorus

Photo Carl Farmer
13 Oct 2002 Portree, Skye

     

 

Juncus acutiflorus

Photo Carl Farmer
13 Oct 2002 Portree, Skye

  Juncus acutiflorus

Photo Carl Farmer
13 Oct 2002 Portree, Skye

Leaf showing the transverse septa (2 horizontal darker green lines across leaf)

 

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