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(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