Lachnagrostis

1.

Inflorescence branches of
lowest 2-4 whorls strongly deflexed at maturity; keel glume projected to a
seta at least 1 mm long

 L. deflexa (VIC) 

Inflorescence branches not
strongly deflexed at maturity; glume keel without a seta or if present leas
than 1 mm long

2

2.

Lemma awn well developed
and strongly geniculate

3

Lemma muticous or with a
weak awn

15

3.

Lemma glabrous

4

Lemma hairy

6

4.

Lemma strongly scaberulous
in upper half

  L. robusta (VIC TA SA)

Agrostis billardieri var.
robusta

Lemma smooth or finely
scaberulous in upper half

5

5.

Lemma with a geniculate and
dorsal awn

 L. billardieri subsp. billardieri (NSW VIC TAS SA WA)

Agrostis
billardieri var. billardieri

Lemma muticous or with an
apical awn

L. billarieri  subsp. tenuiseta  (TAS)

Agrostis billardieri var. tenuiseta

6.

Lemma awn inserted less
than 20% of lemma length from base

7

Lemma awn inserted more
than 25% of lemma length from base

9

7.

Spikelets 3-4 mm long

L. plebeia (WA)

Agrostis plebeia

Spikelets to 4.5 mm long

8

8.

Lemma densely villous

 L. punicea subsp.  punicea (VIC TAS SA)

Lemma finely papillos

 L. puniceasubsp.  filifolia (VIC TAS SA)

Agrostis billardieri
var. filifolia

9.

Spikelets 6-8 mm long;
inflorescence a loosely contracted and dense panicle

 L. drummondiana (WA)

Agrostis drummondiana

Spikelets to 4.5 mm long;
inflorescence not as above

10

10.

Inflorescence becoming
distinctly purple, soon spreading

11

Inflorescence mostly
remaining green, spreading in late maturity

13

11.

Spikelets < 3 mm long;
lemma with scattered hairs

 L. nesomytica subsp. pseudofiliformis (WA)

Spikelets > 3 mm long;
lemma densely hairy

12

12.

Spikelets mostly ≥ 4 mm
long

 L. aemula(NSW VIC TAS SA WA QLD)

Agrostis aemula var. aemula

Spikelets mostly < 4 mm
long

 L. palustris (VIC SA)

13.

Awn column > 0.5 mm wide

 L. preissii (WA)

Agrostis preissii

Awn column < 0.5 mm wide

14

14.

Habit usually annual;
anthers 0.3-0.4 mm long

 L. filiformis (NSW VIC TAS NT SA WA QLD)

Habit perennial; anthers 0.5-0.6 mm long

 L. perennis (SA)

15.

All spikelet pedicels 4 mm
long or more

16

Some spikelet pedicels less
then 4 mm long

19

16.

Lemma awn arising below 20%
of length from apex

17

Lemma awn arising above 20%
of length from apex

18

17.

Lemma awns to 0.8 mm long,
straight

   L. nesomystica  subsp. nesomystica (WA)

Lemma awns 2-2.5 mm long,
curved to geniculate

 L. nesomystica subsp.  paralia (WA)

18.

Spikelet > 3 mm long;
lemma awn > 1.5 mm long

 L. collica (TAS)

Spikelet ≤ 3 mm long; lemma
awn < 1.5 mm long

 L. morrissii  (TAS)

19.

Lemma hairy

20

Lemma not hairy

22

20.

Inflorescence strongly
purple; culms ≥ 50 cm tall

 L. leviseta (TAS)

Inflorescence green or
purplish; culms < 50 cm tall

21

21.

Anthers 0.6-0.8 mm long

 L. lacunarum (TAS) 

Anthers > 0.8 mm long

 L. meionectes (NSW VIC)

22.

Lemma and palea apices
ciliate

23

Lemma and palea apices not ciliate

24

23.

Lemma awnless or awn
0.1-0.7 mm long

 L. scabra subsp.  scabra (NSW VIC TAS)

Lemma awn 1.0-1.4 mm long

 L.scabra subsp.   scabra (VIC)

24.

Lemma muticous

 L. limitanea (SA)

Lemma awned

25

25.

Spikelets ≥ 2.5 mm long

 L. batesii (SA)

Spikelets  > 3.5
mm long

26

26.

Spikelets ≤ 4 mm long

 L. adamsonii (VIC)

Spikelets > 4 mm long

27

27.

Lemma with a geniculate
dorsal awn

 L. billardieri subsp.  billardieri (NSW VIC TAS SA WA)

Lemma muticous or with a
short apical awn

 L. billardieri subsp.  billardieri (TAS)