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Key to blown-grass species (Lachnagrostis spp.)

The following dichotomous key can be used as a guide to identifying a particular blown-grass species. The key works by selecting one of the two choices given for each pair of descriptions, which lead to either another pair or the identification of your species.

1.Leaves flat when fresh
1.Leaves inrolled or closely folded
2.Outer glumes of spikelets with a long awn-like bristle, flower-heads somewhat narrow and stiff with lower branches strongly deflexed (pointing backwards)
Lachnagrostis deflexa
(Deflexed Blown-grass)#
2.Outer glumes finely pointed but without a bristle
3.Leaves less than 3 mm wide, flower-heads drooping or weeping
Lachnagrostis filiformis
(Common Blown-grass)
3.Leaves greater than 3 mm wide, flower-heads more or less stiff and erect
Lachnagrostis billardierei
(Coast Blown-grass)
4.Florets awnless or with non-bent or gently bent awns to 5 mm long or less
4.Florets with sharply bent awns, usually at least 5 mm long
5.Florets more or less awnless, floret hairy
Lachnagrostis leviseta
(Awnless Blown-grass)
5.Florets with awns at least 1.5 mm long, floret hairless or sometimes with a few short hairs on the mid-back
6.Straight or slightly curved awn to 3 mm, arising from near floret tip;
Lachnagrostis adamsonii
(Adamson’s Blown-grass
6.Straight or gently bent awn 3-5 mm long, arising from near mid-back of floret
Lachnagrostis sp.##
7.Upper part of florets with a rough surface
Lachnagrostis robusta
(Salt Blown-grass)
7.Upper part of florets smooth
8.Lower parts of florets covered in hairs
Lachnagrostis punicea ssp. punicea
(Purple Blown-grass)
8.Lower parts of florets hairless
Lachnagrostis punicea ssp. filifolia
(Purple Blown-grass)
# Deflexed Blown-grass is an uncommon species found occasionally in association with Common Blown-grass on fresh-water and slightly saline lake margins in the Western Victorian Region.
## This species has yet to be formally described. It has been found on the edges and beds of a few fresh-water Western Victorian Region lakes but appears tolerant of some salinity. Generally found in association with Common Blown-grass and generally treated as such.

Lachnagrostis punicea spp. punicea spikelet
Purple Blown-grass (
L. punicea ssp. punicea)
Lachnagrostis robusta spikelet
Salt Blown-grass (
L. robusta)
Lachnagrostis adamsonii spikelet
Adamson’s Blown-grass (
L. adamsonii)

Lachnagrostis filiformis spikelet
Common Blown-grass (
L. filiformis)

Lachnagrostis leviseta spikelet
Awnless Blown-grass (
L. leviseta)

Lachnagrostis billardierei spikelet
Coast Blown-grass (
L. billardierei)
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