Beaucarnea recurvata 

The ponytail is a weird palmlike succulent with a greatly expanded base and a single trunk with a rosette of long, straplike leaves that arch and droop. With age, the trunk eventually develops a few branches. Ponytail can get up to 30 ft (9.1 m) tall and the base up to 12 ft (3.7 m) across, but houseplants generally remain less than 6-8 ft (1.8-2.4 m) tall. The leaves are thin and flat, up to 6 ft (1.8 m) long and only 1 in (2.5 cm) wide. They are clustered in dense tufts at the ends of the branches and arch upward, then droop downward. The plant looks a little like a palm, and a little like a big onion sitting on the ground with a single stalk growing up and sporting a parasol of drooping, straplike leaves. Flowers are produced only on large specimens. They are creamy white and inconspicuous individually but borne in large showy upright clusters that extend above the leaves. B. recurvata var. intermedia with shorter leaves, less than 3 ft (0.9 m) long, is the most commonly cultivated variety.