West Highland Flora

Black Bent


Agrostis gigantea

 

Agrostis gigantea

Photo Carl Farmer
26 Jul 2004 Dingwall

Not native; occasional in woods.

Height to c 150 cm.  Spikelets c 2-3 mm long.  Leaves c 3-8 mm wide.

ID: Told as an Agrostis by the spikelets being one-flowered, completely enclosed (when not open) by two more or less equal glumes about 2-3 mm long.  Much larger than other Agrostis sp, which have leaves 5 mm wide at most, usually much less.

Other features: Panicle very open in flower and remaining open in fruit, unlike A stolonifera which closes up again when in fruit and always looks denser than this species.  Spikelets have no awns, or rarely a very short one.  Spreads by underground rhizomes, not above-ground stolons like A stolonifera.  Palea more than half as long as lemma.

 

Agrostis gigantea

Photo Carl Farmer
26 Jul 2004 Dingwall
Max visible width across inflorescence c 3.1 cm

  Agrostis gigantea

Photo Carl Farmer
26 Jul 2004 Dingwall
Visible part of ligule c 5 mm long


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