I've been to all the weed ID sites but I can't find this one:

Tall and single-stem, about 1' tall right now, if you mow it it branches to multi-stem

Maybe a hundred narrow 1/2" long leaves all along the stem, very bright yellow-green

Forms a single yellow flower at the top of the stem about the size of a dime.

I need to know what to spray it with, throw some weed names out for me to try?