Species Tabernaemontana elegans
Pictures from Observations
Etymology of Tabernaemontana:
After Jakob Theodore Mueller von Bergzaben (Latinized name, Tabernaemontanus,"hut or tavern in the mountain"), died 1590, German botanist.
Etymology of elegans:
From the Latin elegans = 'elegant' or 'neat'
Bull. Misc. Inform. Kew 24 (1894)