air yam

Dioscorea bulbifera L.

Air yam carries one of its most conspicuous structures above ground: rounded bulbils tucked where leaves meet the stem. These vegetative propagules can produce new vines after falling, helping explain how the plant spreads without relying entirely on seeds. Beneath the foliage, the perennial vine may also form underground storage organs. University of Florida: Dioscorea bulbifera UF/IFAS: Invasive Plants in Natural Areas, Air Potato

Botanical name

Kew accepts Dioscorea bulbifera in Dioscoreaceae. Air yam and air potato refer here to this exact species. Plants of the World Online: Dioscorea bulbifera

Recognizing the plant

The smooth, broad leaves have heart-shaped bases and pointed tips, with several strong veins radiating across the blade. Leaves alternate along a twining stem that can climb into tree canopies. Brown or tan bulbils become conspicuous among them. Male and female flowers occur on separate individuals; University of Florida researchers note that female plants predominate in Florida and sexual reproduction is rarely observed there. University of Florida: Dioscorea bulbifera

Seasonal development

Florida, United States

In Florida, plants become dormant during the short days of winter; surviving bulbils can generate new growth. UF/IFAS: Invasive Plants in Natural Areas, Air Potato

Native range

Kew describes a native range across tropical and subtropical parts of the Old World to Australia. Florida populations are introduced. There, air yam occupies disturbed woodland, floodplains, thickets and urban landscapes, and can also enter undisturbed habitats. Plants of the World Online: Dioscorea bulbifera University of Florida: Dioscorea bulbifera

Botanical sources

Reviewed 2026-10-11. Seasonal development varies with location and growing conditions.