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Genus Lachnagrostis Family Poaceae

Description: Tufted perennials or annuals.

Ligule membranous; blade flat or folded with inrolled margins. Culms fragile at maturity; nodes glabrous.

Inflorescence an open, much-branched panicle, often completely detaching at maturity. Spikelets small, mostly 1-flowered, with the rachilla extending beyond the floret and minute to nearly as long as the spikelet; rachilla extension glabrous to long-hairy. Glumes more or less equal, as long as the spikelet, acute, firmer than the lemma, 1(–3)-nerved, keel scabrid. Lemma shorter and thinner than the glumes, usually hairy though sometimes glabrous, (3–)5-nerved, dorsally-awned (rarely sub-apical or even more rarely absent); awn scabrid, geniculate or straight; palea 50–100% lemma length.


Distribution and occurrence: A genus of c. 20 species throughout temperate areas and habitats of Australasia. Aust.: c. 10 native species, all States except N.T. From the Greek lachnos meaning wool; presumably 'hairy Agrostis' as most species of Lachnagrostis have hairy lemmas.

Often included in Agrostis.

Text by Jacobs, S.W.L., Whalley, R.D.B. & Wheeler, D.J.B.
Taxon concept: Grasses of New South Wales, Fourth Edition (2008).

Taxa not yet included in identification key
Lachnagrostis aequata

 Key to the species 
1Lemma awnlessLachnagrostis scabra
Lemma awned2
2Lemma glabrousLachnagrostis billardierei
Lemma pubescent
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3
3Small alpine grass, plants 10–30 cm tall; leaves 1–7 cm long, ligule to 5 mm long; panicle to 10 cm longLachnagrostis meionectes
Plants of lower altitudes, plants 20–70 cm tall; leaves usually >7 cm long, ligule 2–8 mm long; panicle 10–30 cm long
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4
4Pedicels of spikelets usually diverging from the axis, spikelets c. 5 mm long, often purplishLachnagrostis aemula
Pedicels of spikelets usually close to the axis, spikelets 2–4 mm long, usually greenish
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Lachnagrostis filiformis

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