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Iris Magnolia does sound gorgeous, but yup, maybe too flowery. From your selections I like Iris Eliza and Iris Olivia best - Iris Adele is nice too.
Some other suggestions that aren't flowers and have 3+ syllables:

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Iris Cecilia / Celia / Cecily
Iris Athena
Iris Francesca
Iris Mariana
Iris Ottilie
Iris Georgina / Georgiana
Iris Leonora
Iris Clementine
Iris Felicity
Iris Miranda
Iris Theodora
Iris Antonia
Iris Victoria
Iris Maia (not enough syllables, but I like it)