Furcraea Roezlii

Agave applanata is a succulent plant that forms a usually solitary rosette of silvery-blue to gray-green leaves with sharp, dark brown to black marginal teeth and a long, dark reddish-brown terminal spine that becomes greyish with age. The rosette can reach up to 6.6 feet (2 m) in diameter and occasionally produces a few offsets. The leaves are marked with bud imprints and can measure up to 3.3 feet (8 m) long and 7 inches (18 cm) wide.

The flowers are bright yellow, shortly tubular, and appear in clusters on a tall spike in spring, usually after 15 to 25 years. The flower spike can grow up to 26.2 feet (8 m) tall.

Source: World of Succulents