"Derek Broughton" wrote ...

... Vallisneria? OK, this probably isn't a very useful example for ITIS,
because I'm pretty sure Water Celery _can't_ be a Vallisneria. afaik,
Vallisneria are submerged plants, and water celery isn't ...

I'm pretty sure this "water celery" is actually water parsley (after doing
some research last year). Water parsley or Oenanthe sarmentosa is often
called water celery; either all green, or a green/white or green/pink
variegated form.

Pic of green plant at
http://www.calflora.net/bloomingplan...coenanthe.html
Pic of variegated plant at http://www.paghat.com/waterparsley.html
--
Zookeeper
Oregon, USDA Zone 7
3500gal pond, 13 pond piggies