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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: P. americana – P. bacigalupii – P. bolanderi – P. californica – P. erythrorhizaP. gairdneri – P. howellii – P. kelloggii – P. lemmonii – P. leptocarpa – P. montana – P. oregana – P. parishii – P. pringlei – P. rusbyi


Perideridia Rchb., Handb. Nat. Pfl.-Syst. 219. (1837) nom. cons.
Type species: Perideridia americana (Nutt.) Rchb. ex Steud. Nomencl. Bot. (ed. 2) (1841) ex. syn. Eulophus americanus Nutt. Coll. Mém. 5: 69, pl. 2. (1829)


Eulophus Nutt. ex DC. Coll. Mém. 69. (1829)
Atenia Hook. & Arn. Bot. Beechey Voy. 349. 1841[1839]


Reichenbach, H.G.L. 1837. Handbuch des natürlichen Pflanzensystems nach allen seinen Classen, Ordnungen und Familien. Dresden: Arnold. BHL Reference page. : 219.
Downie, S.R., Sun, F-J., Katz-Downie, D,S. & Colletti, G.J. (2004) A Phylogenetic Study of Perideridia (Apiaceae) Based on Nuclear Ribosomal DNA ITS Sequences, Systematic Botany, 29(3): 737–751. Available on line [1]. Accessed 2014 Apr. 18.
The Plant List 2013. Perideridia in The Plant List Version 1.1. Published on the internet. Accessed: 2014 Apr. 19. 2014. Perideridia. Missouri Botanical Garden. Published on the internet. Accessed: 2014 Apr. 19.
USDA, ARS, Germplasm Resources Information Network. Perideridia in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 09-Oct-10.

Perideridia is a genus of plants in the family Apiaceae. Plants in this genus are known generally as yampah or yampa. They are native to western North America. Similar in appearance to other plants of the family Apiaceae, they have umbels of white flowers.


The plants have a unique appearance for members of the parsley family, and are tall (1–3 feet) and grasslike, with threadlike leaves 1–6 inches long that resemble blades of grass. The plants effectively mimic tall grass and are virtually invisible until they flower, since they tend to grow in grassy meadows, and prefer full sunlight. Like most members of the parsley family, yampah produces umbels of white flowers. The small roots of yampah are about the size of a large unshelled peanut.
Distribution and habitat

The plants are widely distributed in moist open meadows and hillsides up to 7,500 feet (2,300 m) across Western North America and Northern Mexico.[1]

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Perideridia gairdneri was an important staple crop of Native Americans in Western North America. The nutlike roots of the plant are crunchy and mildly sweet, and resemble water chestnuts in texture and flavor.

Yampah roots were either baked or steamed, and were reported to have excellent flavor and nutritional qualities. The seeds of yampah were used as a seasoning and resemble caraway seeds in flavor. Yampah roots contain rapidly assimilatable carbohydrates, and were used by hunters and runners as a high energy food to enhance physical endurance.

Uncooked yampah roots are a gentle laxative if consumed in excess and were used medicinally for this purpose.[1]

It resembles the highly toxic poison hemlock and water hemlock.

Image Name Common name Distribution Cytology[2]
Wild dill (Perideridia americana).jpg Perideridia americana eastern yampah Midwestern United States n=20
Perideridia bacigalupii Mother Lode yampah, Bacigalupi's yampah Sierra Nevada foothills, California
Perideridia bolanderi (34489290904).jpg Perideridia bolanderi Bolander's yampah] western United States n=19
Perideridia californica California yampah Central Coast Ranges and a section of the Sierra Nevada foothills, California n=22
Perideridia erythrorhiza Lois Shoemaker lg.jpg Perideridia erythrorhiza redroot yampah, western yampah Oregon in the United States
Perideridia gairdneri 1.jpg Perideridia gairdneri Gardner's yampah, common yampah, Indian caraway western North America from southwestern Canada to California to New Mexico n=40,60
Perideridia howellii Howell's yampah Oregon and northern California n=20
J20160721-0005—Perideridia kelloggii—RPBG (28442798402).jpg Perideridia kelloggii Kellogg's yampah San Francisco Bay Area, and the Sierra Nevada foothills, California n=20
Perideridia lemmonii Lemmon's yampah from southeastern Oregon, western Nevada, and the mountains of eastern California
Perideridia leptocarpa narrowseed yampah California, Oregon n=17
Perideridia montana Gairdner's Yampah Montana
Perideridiaoregana.jpg Perideridia oregana Oregon yampah, squaw potato Oregon and California in the western United States n=8, 9, 10
Perideridia parishii yampah umbel top.jpg Perideridia parishii Parish's yampah, Sierra Queen Anne's lace southwestern United States n=19
Perideridia pringlei adobe yampah California n=20


Gregory L. Tilford (1997). Edible and Medicinal Plants of the West. Mountain Press Publishing. ISBN 978-0-87842-359-0.
STEPHEN R. DOWNIE; FENG-JIE SUN; DEBORAH S. KATZ-DOWNIE & GINA J.COLLETT (2004). "A Phylogenetic Study of Perideridia (Apiaceae) Based on Nuclear Ribosomal DNA ITS Sequences" (PDF). Systematic Botany. doi:10.1600/0363644041744437. Archived from the original (PDF) on 2019-01-22.

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