Green, E.L. 1886. Studies in the botany of California and parts adjacent. IV – 1. On some Cichoriaceous Compositae. Bulletin of the California Academy of Sciences. II (5-8): 41-55.

Green, E.L. 1886. Studies in the botany of California and parts adjacent. IV – 1. On some Cichoriaceous Compositae. Bulletin of the California Academy of Sciences. II (5-8): 41-55.