Cleome houtteana, commonly known as spider flower, spider plant,[2] pink queen,[3] or grandfather's whiskers,[4] is a species of flowering plant in the genus Cleome of the family Cleomaceae, native to southern South America in Argentina, Paraguay, Uruguay, and southeast Brazil.

[3] It has also been introduced to South Asia, including the Haor area of Bangladesh and India.

The plant is sometimes mistakenly identified as cannabis due to its leaves and general growth shape.

[6] Cleome houtteana is commonly cultivated in temperate regions as a half-hardy annual.

The cultivar 'Helen Campbell' has gained the Royal Horticultural Society's Award of Garden Merit[7] (confirmed 2017).