Flowers are grouped in reduced terminal or axillary inflorescences, each cyme consisting of 1, rarely 2, flowers. The flower is funnel-shaped. Its color is white or cream. It has a greenish or cream calyx supporting the spreading white corolla. The stamens are enclosed in its throat. The flower can have either globose or elongated fruit capsule, which is narrowly ovate and contains four dark reddish-brown seeds. Each seed contains a fringe of white or yellow silky hairs. Flowers of I. arborescens are major nectar sources for lesser long nosed bats, hummingbirds, and bees. Deer feed on the fallen flowers.