ID - floating/emergent aquatic

 Perhaps a garden escape/throwout, as it's not readily recognisable as a
native species.

     http://www.stewart.hinsley.me.uk/Images/Dicot68a.jpg

Original photo (large)

     http://www.stewart.hinsley.me.uk/Images/IMG_6191.jpg
--
Stewart Robert Hinsley

 On 22/08/2011 23:23, Stewart Robert Hinsley wrote:

Interesting.  Some leaves appear to be orbicular, others obovate.   I
wonder if it is something non-aquatic, which has just been thrown in the
pond and will float until it dies and sinks.

--

Jeff

 
The stems appear to be too tangled in with the waterweed for it to have
been thrown in recently, and the foliage too fresh for it to have been
thrown in any significant time ago.
--
Stewart Robert Hinsley

 "Stewart Robert Hinsley"  wrote

Not something I recognise as a garden pond plant. Could it be, like some
tropical plants, that it has different and quite different immersed and
emerged states.

-- Regards
Bob Hobden
Posting to this Newsgroup
from the W.of London. UK

 
You're sort of right. I've solved the identification myself, by looking
up a list of invasive aquatic plants. It's Ludwigia grandiflora
(water-primrose), which is heterophyllous, that latter leaves being much
narrower.

[The BSBI have 4 taxa of Ludwigia present in Britain, but the alternate
leaves identify this plant as Ludwigia grandiflora.]

Stewart Robert Hinsley