Brown Top Bent Grass at Hackett, ACT
Identification history
| Agrostis capillaris | 9 Apr 2022 | michaelb | ||
| Lachnagrostis filiformis | 19 Feb 2022 | michaelb | ||
| Eragrostis sp. | 18 Feb 2022 | abread111 | ||
| Unidentified | 10 Feb 2022 | abread111 |
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User's notes
Up to about 30 cm high, in a seep area both sides of the track. My USB microscope and dissecting skills are inadequate to identify this grass.
7 comments
abread111
wrote:
11 Feb 2022
michael
I cannot see any sign of awns in any of the photographs...
Could it be https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Lachnagrostis~aequata
which is awnless
I cannot see any sign of awns in any of the photographs...
Could it be https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Lachnagrostis~aequata
which is awnless
abread111
wrote:
17 Feb 2022
Inflorescence branches not strongly deflexed at maturity except some-times for an occasional branch in the lowest 1 or 2 whorls; glume keel without a seta or if seta present then < 1 mm long
Lemma awn well developed and strongly geniculate
Lemma with hairs
Lemma awn inserted 25% or more of lemma length from base
Inflorescence and spikelets not entirely as above
Inflorescence remaining green or sometimes with a purplish cast/flecking but never distinctly purple, sometimes becoming divaricate/spreading in late maturity
Awn column < 0.5 mm wide; plants usually vigorous with thin to broad leaves
Inflorescence drooping to weeping, sometimes developing a purplish cast with maturity; spikelets > 3 mm long, glumes acuminate; anthers mostly 0.3–0.4 mm long
The above is the description of L. filiformis using KeyBase in Flora of Australia for Lachnagrostis.
Some of these criteria definitely do not apply to this sighting.
So what is it?
Lemma awn well developed and strongly geniculate
Lemma with hairs
Lemma awn inserted 25% or more of lemma length from base
Inflorescence and spikelets not entirely as above
Inflorescence remaining green or sometimes with a purplish cast/flecking but never distinctly purple, sometimes becoming divaricate/spreading in late maturity
Awn column < 0.5 mm wide; plants usually vigorous with thin to broad leaves
Inflorescence drooping to weeping, sometimes developing a purplish cast with maturity; spikelets > 3 mm long, glumes acuminate; anthers mostly 0.3–0.4 mm long
The above is the description of L. filiformis using KeyBase in Flora of Australia for Lachnagrostis.
Some of these criteria definitely do not apply to this sighting.
So what is it?
abread111
wrote:
18 Feb 2022
Lachnagrostis has 1 floret per spikelet so this is not a Lachnagrostis. Perhaps an Eragrostis?
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Nearby sightings
Location information
- Coordinates 149.173733-35.250797
- Altitude 669.7m
- Maps Mount Majura
- Places Hackett, ACT
Sighting information
- 101 - 1,000 Abundance
- 5 Feb 2022 11:19 AM Recorded on
- abread111 Recorded by
Additional information
- True In flower
Species information
- Agrostis capillaris Scientific name
- Brown Top Bent Grass Common name
- Not Sensitive
- Exotic
- Noxious or High Risk Weed or Pest
- Up to 1434.75m Recorded at altitude
- Machine learning
-
In flower
- External link More information
Record quality
- Images or audio
- More than one media file
- Confirmed by an expert moderator
- Nearby sighting(s) of same species
- GPS evidence of location
- Description
- Additional attributes
