Koror, Palau
Identification request
2020-10-13T09:15:58.2664278Z
   3
Unidentified grass

Can anyone identify this grass for me?  it grows about 1/2 to 1 meter tall, and has very vigorous white rhizomes a little less than 1/2 cm in diameter.  It is growing in a poorly drained clay soil. Seeds about 1 mm long.

Responses

   0
2020-10-13T23:49:29.3081898Z

Looks like Axonopus compressus to me. Big cousin of Narrow-leafed carpet grass, Axonopus affinis 

   1    0
2020-10-13T23:58:46.9944058Z
Hi Joel & Grahame,

It looks similar to me, the common Guines grass, Megathyrsus maximus ???? Very common in here in Tonga.

Sione Foliaki     
2020-10-14T09:52:27.4228476Z
Yes, the inflorescence looks a lot like Guinea grass inflorescence, but this is definitely not Guinea grass, which I know well. I have been looking at images of Axonopus affinis on line, and those don't match either. Does anyone else have any suggestions?
   1    0
2020-10-14T23:20:17.7937419Z

We'd be interested to know whether this key is of any help - https://keys.lucidcentral.org/search/ausgrass-grasses-of-australia/


Australia
2020-10-17T04:11:58.3161943Z
How do I open it? Please send me an email: joelmiles52@gmail.com
   0
2020-10-16T04:07:13.8659087Z

Hi Joel and Grahame,

For the benefit of the broader Pestnet audience, my colleague Stephen McKenna provided the following feedback directly to Joel.

Regards

Barbara W.

Hello Joel
Grasses are difficult to identify at the best of times, even with them at hand!!!

NOTE – this is a not a definitive identification - While the images aren’t at a high-enough resolution and the description not detailed enough for a definitive identification, the grass does look a bit like a widespread species called Panicum repens (torpedo grass).

It has been recorded from Palau (Global Biodiversity Information Facility) as an introduced plant. It is widespread globally – see GBIF distribution map below. It grows in impeded drainage areas and can be very vigorous.  For a definitive identification, a specimen should be collected and verified with a grass botanist or a herbarium.


Some references:
https://www.cabi.org/isc/datasheet/38670
https://plants.ifas.ufl.edu/plant-directory/panicum-repens/
https://plants.ifas.ufl.edu/site/assets/files/1137/panrep.pdf
 
Regards, Stephen
Stephen McKenna
Botanist, Northern Australia Quarantine Strategy