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Other ShrubHakea decurrens subsp. decurrens

Bushy Needlewood at Mount Ainslie

3 images

Hakea decurrens subsp. decurrens at Mount Ainslie - 13 Oct 2018
Hakea decurrens subsp. decurrens at Mount Ainslie - 13 Oct 2018
Hakea decurrens subsp. decurrens at Mount Ainslie - 13 Oct 2018

Identification history

Other Shrub Hakea decurrens subsp. decurrens 14 Oct 2018 BettyDonWood
Other Shrub Hakea decurrens subsp. decurrens 13 Oct 2018 BettyDonWood

13 comments

   13 Jun 2015
Silke it is pretty hard to tell the invasive decurrens subspecies from that of physocarpa subspecies. This looks like Hakea decurrens subs'. physocarpa. The Flora of NSW identifies the two sub-species by the width of the pod and the width of pale wood when the pod is split in half. decurrens has a 14-19 wide pod and a pale wood zone in the pod of 3-6mm, while physocarpa has a 15-35mm wide pod and pale wood zone of 6-12mm. I leave it to you to confirm
   13 Jun 2015
Sorry Silke actually Hakea decurrens subs decurrens is the native subspecies and physocarpa the weedy one
SilkeSma wrote:
   14 Jun 2015
Thanks Michael, I was indeed wondering how to tell the decurrens apart. I'll go and do some measuring.
SilkeSma wrote:
   17 Jun 2015
Hi Michael, I had a look at some pods today. It's not entirely clear cut but but on average I'll go with the physocarpa subsp. The size of the pods is at the low end of physocarpa.
   27 Mar 2018
Sorry. I reversed the ID before reading the comments. Though three years down the track, with no other sightings of this subspecies, it might be an idea to find an open pod and redo the measurements. The place to do it is beside the seed cavity.
waltraud wrote:
   8 Oct 2018
Given there are large numbers of the local subsp decurrens further north I indeed wonder whether this is physocarpa.
Silke, would you be able to collect the fruits of this specimen? They will open after a couple of days and then you can carry out measurements as suggested by Betty.
SilkeSma wrote:
   8 Oct 2018
No problem, I'll get some when I'm over that way next time.
SilkeSma wrote:
   13 Oct 2018
I've taken a photo of the seed pods with a ruler next to it. I still can't make up my mind. Over to the experts please.
   13 Oct 2018
I cannot remember why I thought it was subsp. physocarpa at the time. Presumably on the diameter of the nuts (follicles according to botanists). Having looked at the pale wood zone of the nuts (usually 6-12 mm wide in physocarpa, usually 3.5-6 mm wide in decurrens) and the outer layer (usually 2.5-5 mm wide in physocarpa, usually 1-2.5 mm wide in subsp. decurrens), and the fact that is extremely unlikely for the coastal subsp, physocarpa to have been planted in the ACT, I have decided it must be subsp. decurrens, the conmon subspecies in the ACT.
   15 Oct 2018
Thanks for being so persistent Silke and helping us come to the right ID
waltraud wrote:
   15 Oct 2018
Great! thanks Silke.
   15 Oct 2018
Everyone. The reason both suggested names are subsp. decurrens now and the dates the same is that I merged subsp. physocarpa into subsp. decurrens over the weekend, not realising that the background maintenance was down. Everything went pear shaped. Rohan has said he will try to fix it.
waltraud wrote:
   15 Oct 2018
Yes, these kind of things happen when working with huge mega data stuff. We all understand and are very grateful to the CNM background scewing team who work hard to get things running as amazingly smooth as possible.

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Nearby Sightings

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Wurmbea dioica subsp. dioica (Early Nancy) at Mount Ainslie - 13 Sep 2015
Astroloma humifusum (Cranberry heath) at Mount Ainslie - 13 Apr 2015

Page 1 

Location

Location information

Species information

  • Not Sensitive
  • Local Native
  • Non-Invasive

Sighting information

  • 4 - 15 Abundance
  • 13 Oct 2018 4:08 PM Recorded on
  • SilkeSma Recorded by
  • Website Reported via
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