Air Potato has a winter dormant period when the stems die back to the ground. After dormancy, the underground tubers give rise to stems which quickly grow, often reaching up to 70 feet long by the end of the growing season.
The vine's stem is herbaceous, not woody and round. The large leaves are up to 8 inches long and are heart-shaped (cordate). The leaf blade's basal lobes are rounded. Leaf veins radiate from a single point. The leaves have long stems (petioles), and are alternate on the stem. Air Potato flowers are small, greenish and fragrant, hanging in relatively long clusters (panicles and spikes) up to 4 inches long. The fruit is a capsule of seeds. Air potato plants produce "aerial tubers" that are attached closely to the stems where leaves attach to the stem (axil). These air potatoes are grayish and somewhat irregular. Tubers also grow underground where they may be larger.
(Stone, B. C. 1970. The flora of Guam).
(Wagner, W.L., D.R. Herbst and S.H. Sohmer. 1999. Manual of the flowering plants of Hawai'i).