Flowers are erupting fuzzy seeds. Growing in Baton Rouge, LA at the edge of a sunny meadow, 10/22/08
The fuzzy strands on the seeds are dense and tangled. Looks like foam.
The tangles of fuzz make the seeds look like they are having a bad hair day.
Stems are swollen where they branch. Branches are often directly opposite. A leaf grows beneath each branch. Stems have grooves/ridges.
The leaves feel rougher on the top than on the bottom. Leaf edges are ragged.