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Perideridia erythrorhiza Lois Shoemaker lg

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Campanulids
Ordo: Apiales

Familia: Apiaceae
Subfamilia: Apioideae
Tribus: Oenantheae
Genus: Perideridia
Species: Perideridia erythrorhiza

Perideridia erythrorhiza (Piper) T.I.Chuang & Constance, 1969

Ataenia erythrorrhiza (Piper) H.Wolff
Carum erythrorhizum Piper

Native distribution areas:

Continental: Northern America
USA (Oregon)

References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition

Chuang, T.I. & Constance, L. 1969. University of California Publications in Botany. Berkeley, CA 55: 71.


Hassler, M. 2018. Perideridia erythrorhiza. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2018. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: 2018 Aug. 25. Reference page.
International Plant Names Index. 2018. Perideridia erythrorhiza. Published online. Accessed: Aug. 25 2018.
The Plant List 2013. Perideridia erythrorhiza in The Plant List Version 1.1. Published on the internet. Accessed: 2018 Aug. 25. 2018. Perideridia erythrorhiza. Missouri Botanical Garden. Published on the internet. Accessed: 2018 Aug. 25.
USDA, ARS, Germplasm Resources Information Network. Perideridia erythrorhiza in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 07-Oct-06.

Vernacular names
English: Western yampah

Perideridia erythrorhiza is a rare species of flowering plant in the family Apiaceae known by the common names western yampah and redroot yampah. It is endemic to Oregon in the United States, where there are about 20 occurrences. The populations occur in three regions in southwestern Oregon, which are separated by more than 50 miles (80 km).[1] The three separate groups are in the Klamath Mountains and on either side of the Cascade Range.[2]

This plant is a perennial herb growing up to 1.2 meters (3 ft 11 in) in height. The roots are pink to reddish brown in color. The inflorescence is an umbel of tiny white flowers.[1] Blooming occurs in July through September.[2]

This species grows on valley floors in heavy clay soils. The habitat is prairie, pasture, and the edges of woodlands. Other plants in the habitat may include tufted hairgrass (Deschampsia cespitosa) and California oatgrass (Danthonia californica).[1]

Threats to this rare species include housing development, agriculture and grazing, herbicides, introduced species, and nickel mining.[2]

It has been proposed that one of the three groups of populations may represent a separate species.[3]

Perideridia erythrorhiza. The Nature Conservancy.
Perideridia erythrorhiza. Archived 2011-10-26 at the Wayback Machine Center for Plant Conservation.
Meinke, R. J. (2006). Experimental outplanting of Perideridia erythrorhiza ("Klamathense") on the Fremont-Winema National Forest. Prepared for the Fremont-Winema National Forest under Agreement Number 2003-CS-11060220-020.

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