Ibervillea lindheimerii, diameter 17 cm (No. 1)

Genus Ibervillea is native to Mexico and South West USA, where it grows in well-drained grit.
Produces a large, whitened, subterranean caudex, from which come vines that will tolerate hot sunlight and drought.
Exposed caudex should be shaded. It can grow to 40 centimeters in diameter.
The leafs can become 3 m in length and the flowers are yellow and green.
Member of the Cucurbitaceae family.
Temperature 12 tot 15°C.