Seems like there's a few botanica names for it and "spanish needle"
means any of the botanical names.

Is bidens alba at the following sites:
http://www.nbbd.com/godo/ef/plants1/
http://edis.ifas.ufl.edu/BODY_HS150

The second link indicates that there should be hair on the underside of
the leaf. I don't seem to find any hair there. But the plants look very
much the same.

Is bidens pilosa at:
http://www.medicineatyourfeet.com/bidenspilosa.html
But the leaves are slightly different than what is viewed at:
http://www.botany.hawaii.edu/faculty/carr/page3.htm

I'm reading that the soil in Miami is high in phosphorus and
I'm thinking that might be close to what the soil rating of
Saint Petersburg would be. Sometimes I only need to dig
1/2 an inch to get to sand. Is it possible that soil is turned
to sand within a year ? We put about 800 pounds of soil
out front in bare places trying to get some grass to grow
but the soil has all seemed to turn to sand within the year.

--
Jim Carlock
http://www.microcosmotalk.com/
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"prem_s" wrote:
Jim Carlock wrote:

http://www.microcosmotalk.com/images...n/weed3683.jpg

I keep thinking dandelion, but the dandelion pics I see don't
look like that.


It's known as "Spanish Needles" by common name, Bidens bipinnata
botanically. They have these annoying longish black seeds with
prickles on one end that stick to clothing (and animal fur).

---Prem
www.premdesign.com