(species Tropaeolum peregrinum), annual climbing herb, of the family Tropaeolaceae, native to northwestern South America and introduced to other regions as a cultivated garden plant. It grows to a height of 1.8–3 m (6–10 feet). The leaves are round and deeply five-lobed. The flowers, about 2.5 cm (1 inch) across, are pale yellow and have a long, green spur.