Gardenia Species : Atlanta Botanical Garden : Atlanta : 23JUN20 : AK-37 : 11 posts by 4 authors. Attachments (2)
Seen in the garden during my visit in October, 2018.
These were small shrubs, had seen them in other places too.

Gardenia jasminoides is planted in India
I do not know about Atlanta.
Side view of the flower is missing.

A similar plant I had seen in the Home Depot in Atlanta was Gardenia jasminoides ‘Pinwheel’.
These were dwarf, compact plants.

I hope Gardenia thunbergia.

I guess … is correct !

Did you check for Gardenia jasminoides ‘Pinwheel’ that I had suggested?

I went through the links.  Your suggested id seems correct to me. 

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