Markhamia lutea, the Nile tulip, Nile trumpet or siala tree is a tree species of the family Bignoniaceae,[2] native to eastern Africa and cultivated for its large bright yellow flowers.

Native to Africa, Markhamia was named in the honour of Clements Markham (1830-1916), who worked in India.

Leaves, of 20–30 cm in length, normally arranged in groups in the ends of the branches.

They are trumpet shaped, yellow in colour, with orange-reddish spots in the throat.

Fruit is a capsule, of up to 70 cm in length, with abundant winged seeds.