The Smithsonian Institute has species listed,
http://biogeodb.stri.si.edu/he...
Turnera panamensis shows a 'crown' (enlarge photo), the leaves look narrower ..
http://biogeodb.stri.si.edu/bi...
It looks like a large shrub, and flower petals are pointed ..
http://biogeodb.stri.si.edu/he...
Turnera ulmifolia has very different flowers!
A list of Turnera, and reference to keys ..
http://www.yorku.ca/shore/Turn...
Discover Life references ..
http://www.discoverlife.org/mp...
More on plantillustrations ..
http://www.plantillustrations....
