Slice bananas and dip in lemon juice to prevent darkening.
Peel pineapple; cut crosswise into 1/4- inch-thick slices, then cut each slice in half.
Peel, seed, and slice papaya.
Cut peel and all white membrane from oranges; slice oranges crosswise.
Arrange fruit equally on 4 salad plates; garnish with raspberries and citrus blossoms, if desired.
Offer dressing to spoon over fruit.