Orthocarpus, or owl's-clover,[1] is a genus of flowering plants in the family Orobanchaceae (broomrapes).

Plants of the genus are generally less than 30 centimetres (1 ft) in height.

[2] Like their close relatives in genus Castilleja, Orthocarpus are root hemiparasites, capable of photosynthesis but extracting water and mineral nutrients through attachment to the roots of host plants.

Some animal species such as the Edith's checkerspot butterfly use these plants as hosts during ovipositing.

[3] As of March 2022[update], Plants of the World Online accepted the following species:[4]