Perideridia erythrorhiza (Piper) Chuang & Constance
Annotated by Tsan-Iang Chaung & Lincoln Constance, 1965. Remarks: [Verbatim determination date: 1965-1968.] Herbarium of the University of California, Berkeley; A Systematic Study of the Genus Perideridia.

Oregon: Douglas County: [locality and coordinates withheld; status in Oregon: S2 (Imperiled; OBIC)],
Swaley streets. Phenology: Flowers & Fruits. Cotype: Carum erythrorhizum Piper. Published 1916. Proceedings of the Biological Society of Washington 29: 100. 1916.
Cotype: Perideridia erythrorhiza (Piper) Chuang & Constance. Published 1969. University of California Publications in Botany 55: 71. 1969.

Wm. C. Cusick 4466, Aug 19, 1914
WTU, Accession: 139343, Barcode: WTU-V-000742