I found a photo of Turnera ulmifolia on a Florida Native Plant site, the centre does have the 'crown' but others don't, maybe they do have both types as I linked to examples with both above. The petals overlap! The icon shown means it's non native to Florida. I guess it's as reliable as any other and variations could be due to self seeding from hybrids derived from the species which could be man made or natural.
http://www.floridanativeplants...
An interesting write up ..
http://keysnews.com/node/22170
The likeness to Elm leaves ..
http://www.uniprot.org/taxonom...
Lin, I would leave your photos where they are, this plant is well established in Florida.
