Pipewort, Gu Jing Cao?

This is a repost from my main BackForty blog. I'm still investigating any medicinal uses for Pipeworts. TCM utilizes one type of pipewort, known also as Gu-Jing-Cao.  Below is the original post.  I still have yet to specifically identify this particular pipewort  shown in the picture, growing on our Someday Farm.
----------------------------------------------------------------------------------

Whitehead Bog Button variety of Pipewort, maybe??  Lachnocaulon anceps??

If anyone can help me identify this wildflower, I'd love it!  It is very small and seems to grow in clusters here in wetland edges in southwest Florida.  The stem is long and thin and the blossom is a small globe shape, bright white.

Syngonanathus flavidulus?  If so, this is the Yellow Hatpins variety of Pipewort

I believe this is the same kind of flower, a little closer look.

Thanks for any help you might give me in identification.  These are new to me :-D

~ Robbyn

Update!   I believe the second picture is for sure some variety of pipewort in the Eriocaulon species , such as Syngonanthus flavidulus (Yellow Hatpins), and the first is maybe Lachnocaulon anceps (Whitehead Bog Button)?  I think they are all in the Eriocaulacae family.  Still not sure if they're one and the same...so shall keep on looking.  And next time I'll get a better closeup of the foliage.  Even this helpful page isn't much help unless I have a foliage comparison...

-------------------------
August 21, 2012 update....Here is a link for the king of Pipewort used in traditional Chinese medicine (TCM) and its actions:  http://www.yinyanghouse.com/theory/herbalmedicine/gu_jing_cao_tcm_herbal_database

This might be the one closest in ID to what I saw:   Tenangle Pipewort - Eriocaulon decangulare, http://www.floridasnature.com/florida_herbs_8.htm

.