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Gardenia jasminoides
http://www.desert-tropicals.com/Plants/Rubiaceae/Gardenia_jasminoides.html
Image and description.
Gardenia taietensis
http://www.botany.hawaii.edu/faculty/carr/images/gar_tai.jpg
image
Gardenia thunbergia
http://www.dipbot.unict.it/orto/0205-1.html
image
Hawaiian Native Plants - Gardenia
http://www.botany.hawaii.edu/faculty/carr/gardenia.htm
Images of the endangered endemic Gardenia brighamii, O'ahu endemic G. mannii, and Moloka'i endemic G. remyi.