I don't know about that, but Lythrum portula has leaves of a firmer texture
and darker colour, often with a brown tinge, than Montia fontana.
Beside the point, I know, but Anagallis arvensis is one plant which
invariably has square stems. Twice I have acquired through seed exchanges
what purported to be A. monelli, and both times I knew it was wrong as soon
as the seedlings had a shoot beyond the cotyledons. (I now have
blue-flowered A. arvensis as a tolerated garden weed).
From: clarelcoleman [mailto:clare@...
Sent: 01 February 2005 20:09
Subject: [UKBotany] Re: Mystery water plant
It is often said that Lythrum portula has a square stem whereas
Montia fontana has a round stem. Obviously the flowers are different
but this might help with veg id. I have found that this difference
does work but has anyone else tested this character?? I am always a
bit sceptical about stem shape as it is pretty plastic in many
plants (at least the external form is; internal anatomical
structures are a different matter) but several botantists I know do
swear by this difference.
--- In UKBotany@yahoogroups.com
, "Richard Lansdown" <rlansdown@a...>
> The "maybe water purslane" is Montia fontana (blinks), I have found
> (relatively) enormous plants in enriched acidic habitats - water
> has rounded leaf apices.
> I would be almost certain that the mystery is Cardamine pratensis,
> although the leaflet shape is a bit odd.
> Hope this helps.
> Richard Lansdown
> Ardeola Environmental Services
> 45 The Bridle, Stroud, Glos. GL5 4SQ
> Tel: 01453 763348; mobile: 07802 196494
> Aquatic & Wetland Plant Forum: http://www.ardeola.demon.co.uk
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