Rytidosperma duttonianum

Brown-back Wallaby Grass at Mitchell, ACT

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Identification history

Rytidosperma duttonianum	13 Jan 2023	Tapirlord
Rytidosperma duttonianum	11 Jan 2023	Tapirlord
Rytidosperma caespitosum	11 Jan 2023	MattM

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User's notes

Inflorescence provided to me by a colleague. Location is Gungaderra Grasslands Nature Reserve.

5 comments

MattM wrote:

11 Jan 2023

Using the PlantNet key this keys to R. caespitosum as the lemmas are not golden-brown. However the VICFlora key could go to either R. duttonianum or eventually continue to R. caespitosum depending on how couplet 10 is interpreted. Reading the VICFlora descriptions, the descriptions and measurements for the lemma and lateral lobes are a better match for R. duttonianum.

Tapirlord wrote:

11 Jan 2023

I got to R.duttonianum fairly easily in the Vicflora key (didn't even consider using plantnet), my understanding is the lemmas are paler when young maturing to a golden-brown color. I'm not quite sure about the dimensions of the individual seeds, in R.duttonianum they are significantly wider.

Tapirlord wrote:

11 Jan 2023

Also I believe that the lower branch of the flower stem is devoid of spikelets for the lower 1/3 to 1/2 of its length, suggesting R. duttonianum.

https://www.inaturalist.org/observations/145393807
https://www.inaturalist.org/observations/145870151

Grassman wrote:

13 Jan 2023

I'd agree with R. duttonianum. Lemma looks too broad for R. caespitosum and extent of bare lemma is more typical of R. duttonianum. Checking paleas can also help ID - broad lanceolate and mostly hairless in duttonianum and narrow lanceolate and hairy in caespitosum

Tapirlord wrote:

13 Jan 2023

Thank you, the expert confirmation is much appreciated.

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Location information

Sighting information

1 Abundance
9 Jan 2023 12:00 PM Recorded on
MattM Recorded by
Collections
Plants Grasses MattM

Species information

Rytidosperma duttonianum Scientific name
Brown-back Wallaby Grass Common name
Not Sensitive
Local native
Non-invasive or negligible
Up to 772.53m Recorded at altitude
Machine learning
In flower

Record quality

Images or audio
More than one media file
Verified by an expert moderator
Nearby sighting(s) of same species
GPS evidence of location
Description
Additional attributes