Perideridia montana

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Perideridia gairdneri
Photo Credit Robert Gilbert

Perideridia gairdneri, also called Gairdner's yampah, common yampah, or Gardner's yampah is a flowering plant in the carrot family (Apiaceae).


  • Kingdom - Plantae
  • Subkingdom - Tracheobionta
  • Superdivision - Spermatophyta
  • Division - Magnoliophyta
  • Class -Magnoliopsida
  • Subclass - Rosidae
  • Order - Apiales
  • Family - Apiaceae
  • Genus - Perideridia
  • Species - P. gairdneri


General: Slender, glabrous perennial from a tuberous-thickened, edible, usually solitary root, the solitary stem 4-12 dm. tall. Leaves: Leaves several, well distributed along the stem, the blade once pinnate or ternate; the ultimate segments elongate and narrow. Flowers: Inflorescence of terminal and 1-several lateral compound umbels, the umbels 2.5-7 cm. wide; rays up to 6 cm. long at maturity; involucre of a few, narrow bracts; involucre of bristly bracelets, or wanting; calyx teeth well developed; flowers white. Fruit: Fruit glabrous, sub-orbicular, 2-3 mm. long and wide, with prominent ribs.

-cnlm pages

Bloom Period

July to August



Occurs from British Columbia to Saskatchewan, south across the Rockies and West Coast, down to Southern California.



Dry to vernally moist open forest, meadow, or grassy slope. Low to middle elevation.

Source: Pojar 221


Roots either eaten boiled or dried and pounded to make a flour with an anise seed-like taste (Pojar and MacKinnon, Turner 1995).

Blackfoot Drug (Antidiarrheal) - Infusion of roots taken to counteract cathartic and emetic effects of another infusion.

Blackfoot Drug (Antiemetic) - Infusion of roots taken to counteract cathartic and emetic effects of another infusion.

Blackfoot Drug (Breast Treatment) - Infusion of roots used to massage sore breasts with warm stones

Blackfoot Drug (Cough Medicine) - Infusion of roots or roots chewed for coughs.

Blackfoot Drug (Cough Medicine) - Root smudge smoke inhaled for nagging coughs.

Blackfoot Drug (Dermatological Aid) - Infusion of roots applied to sores and wounds.

Source: Pojar pg 221


Hand collect seeds in August when seeds have turned brown and are easily stripped off inflorescence into paper bags. Store seeds in sealed containers at 5º C. Seed will retain viability for up to five years. Sow seeds in fall and allow natural stratification, or sow stored seeds in the spring after six to eight weeks of cold, moist stratification.

Photo Gallery


The Seed

Perideridia gairdneri
Photo Credit Lisa Hintz

Peridendia gairdneri


Seed sample from 2011


Average Measurement: 2.3 x 1 x 1

Measurement Range: L: 1.5 – 3, W: 0.8 – 1.1, D: 0.75 – 1.3

Latitudinal Cross Section: ovate

Longitudinal Cross Section: elliptical

Shape: Seed schizoid, flat on one plane, and rounded on the opposite plane. Lots of irregularity in shape.

Color: Various shades of green and brown. Hilum usually white. Some seeds have pink from remnant flower structure at apex opposite hilum.

Surface: Seeds have five ridges on outer seed face that run from hilum to opposite apex longitudinally. Inner seed face has one white rib that bisects the seed face.

Basic Explanations and Assumptions:

The dimensions for the seeds are length x width x depth. The location of the hilum is used as the base of the seed, and the length is measured from hilum to the opposite apex. Where a style is present, the length is measured from the hilum to the bottom of the style. Width is measured at a right angle to the length at the widest part. Depth is measured at a right angle to the intersection of height and width lines.

Measurements included are the mean average for each measurement of ten separate seeds.

All measurements in millimeters unless otherwise noted.