Persicaria lapathifolia

Pale Knotweed at Greenway, ACT

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Identification history

Persicaria lapathifolia	29 Jan 2016	RussellB
Persicaria lapathifolia	28 Jan 2016	MichaelMulvaney
Unidentified	27 Jan 2016	ArcherCallaway

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3 comments

MichaelMulvaney wrote:

29 Jan 2016

Ryu a close -up of the stem and node - where the leaves join the stem would have been good for ID purposes

ArcherCallaway wrote:

29 Jan 2016

I do have another shot, will add it, although I don't know if it will exactly help. Also see butterfly sighting http://canberranaturemap.org/Community/Sightings/Details/2458112 for a few more closeups

ArcherCallaway wrote:

30 Jan 2016

What are the key features that seperate this from Persicaria decipiens? If my assumption that http://canberranaturemap.org/Community/Sightings/Details/2458191 is Persicaria lapathifolia, I am fairly sure that this is a different species as the overall impression I got was fairly different. Subsequently, I have had a look at the plant net and noted a few things: P. decipiens is meant to be up to 30cm high whereas P. lapathifolia is meant to be 50-180cms. Every plant in this large group of this plant was probably about 20-30cms high.

I have also put in a closeup (or there is a better one in the butterfly sighting), so Michael could you have a look at that? What is the difference you were looking for there?

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