One tree that has white pollen in May is the cherimoya, Annona cherimola, which produces edible fruit with segmented green rinds and pale inner flesh. The flowers bloom in late spring or early summer. The cherimoya tree is from South America but grows in the warmer regions of the United States, such as Hawaii and Southern California , Florida and South Eastern states. Look for droopy, whitish flowers with three long petals that hang downward. The outsides of the petals may be brownish. Leaves are large, up to three-quarters of a foot long, but the tree tends to drop leaves before forming flowers.