Calflora, a 501c3 non-profit
Distribution by County   11041    
Porophyllum ruderale  (Jacq.) Cass.  var. macrocephalum  (DC.) Cronquist
Yerba porosa
Porophyllum ruderale var. macrocephalum is an annual herb that is not native to California.
Record Count by County

Los Angeles: 1 Riverside: 2

Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria. [web application]. 2022. Berkeley, California: The Calflora Database [a non-profit organization]. Available:   (Accessed: 12/02/2022).