Overview

Oregon yampah (Perideridia oregana) is a perennial herb in the carrot family (Apiaceae) native to the western United States. Its edible root has a nutty, slightly sweet flavor reminiscent of chestnuts or parsnips. The plant is also known by the common name Eppaw.

Origin and history

Oregon yampah is native to Oregon and California, where it grows in woodland and other habitats [1]. The plant was used as a food source by several Indigenous groups in the region, who harvested the small, tuberous roots. The genus name Perideridia is derived from Greek, meaning “around the neck,” possibly referring to the arrangement of the root tubers. The species was formally described in the botanical literature in the 19th century.

Varieties and aliases

  • Oregon yampah (common name)
  • Eppaw (common name)
  • Perideridia oregana (scientific name)

No named horticultural varieties are widely recognized.

Culinary uses

The primary edible part of Oregon yampah is the small, clustered root, which can be eaten raw or cooked. When raw, the roots have a crisp texture and a mild, nutty flavor. Cooking intensifies the sweetness and softens the texture, making them suitable for roasting, boiling, or adding to soups and stews. The roots were traditionally harvested in late summer or fall when the plant’s energy was concentrated below ground. The seeds and young shoots are also edible, though less commonly used.

Cross-cuisine context

Oregon yampah has no widely recognized analogue in Mexican cuisine. Its closest functional parallel in the platform’s corpus is the jícama (Pachyrhizus erosus), which is also a root eaten raw for its crisp texture and mild sweetness. However, jícama is a legume, not an Apiaceae, and is much larger and more widely cultivated. Among other LA-relevant cuisines, the root’s nutty, starchy character is comparable to the water chestnut (Eleocharis dulcis) used in Chinese and Vietnamese cooking, though the two plants are botanically unrelated.

Notes for cooks

  • Harvest roots in late summer or fall when the plant’s above-ground parts begin to die back. Roots are small and clustered; dig carefully to avoid breaking them.
  • Store unwashed roots in a cool, dry place for up to a week, or refrigerate in a paper bag for slightly longer.
  • The plant’s leaves and stems resemble poison hemlock (Conium maculatum) and other toxic Apiaceae. Positive identification is essential before foraging.