recent acquistions, id help please

[plant57va]

Recently, (two weeks ago) I was working down in the Orlando Fl area.
on my way out of town, I travelled a different way home and hit a couple creeks and rivers, and well,,, ditches for another description.

I brought back several pieces of plants that seemed to be quite prolific and would love to get some help with id-ing them (cavan????)

anyhow, I am attaching some pics, ('id#1', #2, etc)
thanks for your help here....
the one plant, seems to have very red stems, and quite attractive to me...
this area had a lot of hydrocotyl, or similar species...

another found in a different area, seems to have roundish leaves...

if you need any other pics or info please advise....

most of these were found during low tide, and in silty black muck...

FYI #1
#2 & #4 same plant
#3, #5, & #6 same plant
#7, #8 & #9 same plant

the one with greenish round leaves, (id#4) was found in a different spot, alonside the water, growing mostly submerged, but this area was not affected by tides,
closer to orlando.

[krisw]

I forwarded to the experts... Their responses:

From Cavan:
#7/8/9 -- Ludwigia sp. -- not sure which one from picture
#3/5/6 - Phyla nodiflora

From Ghazanfar:
#1 - Water cress