Ibervillea maxima (Dieterlea)

Ibervillea maxima is a caudiciform perennial vine in the Cucurbitaceae family native to arid regions of Mexico and the southwestern United States. It develops a large, swollen underground caudex that stores water, with slender, twining vines emerging during the growing season. Leaves are variable but often lobed or heart-shaped, while small, yellowish flowers are followed by rounded fruits that resemble miniature gourds. The plant typically enters dormancy in dry or cool periods, shedding its vines and relying on the caudex.

This species prefers full sun to partial shade and very well-drained, mineral soil suited to dry conditions. Watering should be moderate during active growth and minimal during dormancy. Growth rate is moderate when established. Cold tolerance is relatively good for a caudiciform, with the caudex able to withstand brief drops near freezing if kept dry; generally suited to USDA Zones 8 to 10. Ibervillea maxima is well suited to container growing, where its caudex can be displayed above the soil surface.