In article , Paul
wrote:

I am in west Houston.
The lawns here have weeds that look like chickweed
except the flowers are yellow instead of white.

This is the plant but with yellow flowers:
http://urbanfringe.files.wordpress.c.../chickweed.jpg

IT IS NOT OXALIS !!!
It must be a species of chickweed but cannot find any pics
with yellow flowers.

Any ideas what it could be?

Thanks,
Paul

I think that what you are seeing is horseherb
http://www.nativesoftexas.com/horse_herb.htm

Cea