Perideridia gairdneri, also called Gairdner's yampah, common yampah, or Gardner's yampah is a flowering plant in the Apiaceae family.
- Kingdom - Plantae – Plants
- Subkingdom - Tracheobionta – Vascular plants
- Superdivision - Spermatophyta – Seed plants
- Division - Magnoliophyta – Flowering plants
- Class -Magnoliopsida – Dicotyledons
- Subclass - Rosidae
- Order - Apiales
- Family - Apiaceae – Carrot family
- Genus - Perideridia
- Species - P. gairdneri
P. gairdneri is a thick, tuberous rooted perennial herb that is slender and hairless. It has solitary, leafy stems, and grows from 40 - 120 cm tall. It has several, well distributed leaves that are once or two times pinnately divided into long, narrow segments. Flowers are white or pink and small, and are united in groups to form one to several compound umbels. Fruits are nearly spherical and slightly flattened, with distinct ribs. Fruits 2 - 3 mm long.
Source: Pojar pg 221
July to August Source: http://biology.burke.washington.edu/herbarium/imagecollection.php
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 of P. gairdneri were eaten my Straits Salish and other First Peoples groups of the Northwest, and by interior peoples from south central British Columbia, to the great basin. The roots were pounded by native people to make flour.
Source: Pojar pg 221
Peridendia gairdneri – PEGA
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.