Page authors: Don Knoke, David Giblin
Lomatium piperi
Piper's lomatium
WTU specimens
Other herbaria

Distribution: East of the Cascades in Washington; central Washington south to northern California.

Habitat: Sagebrush-bunchgrass steppe up to ponderosa pine forests.

Flowers: April-June

Origin: Native

Conservation Status: Not of concern

Description:
General:

Low, glabrous perennial from a globose-thickened taproot, with each stem bearing at least one cauline leaf, 10-25 cm. tall.

Leaves:

Leaves few, bi-ternately compound and pinnately-ternately dissected; petiole slender, sheathing, green or purplish tinged; leaf blades oblong to ovate in outline, 1.5-5.5 cm. long, glabrous; ultimate leaf segments 10-30, linear, 0.2-4 mm. long. Thickened root 0.5-1 cm. in diameter, brown, smooth.

Flowers:

Umbels usually 2, one terminal, the other borne in the axil of the single leaf; rays 3-10, 1.5-3.5 cm. long; involucre none; involucel bractlets 2-6, narrowly elliptic, 0.5-2 mm. long; calyx obsolete; flowers white, with purple anthers; pedicels 0.5-2.5 mm. long.

Fruits:

Fruit ovate, 4-9 mm. long and 2.5-5 mm. wide, the lateral wings the width of the body.

Identification Notes:

Compared to L. piperi,. L. gormanii has no stem leaves, the globose root is covered with rootlets, and the wing on the fruit is narrow.

Accepted Name:
Lomatium piperi J.M. Coult. & Rose
Publication: Contributions from the United States National Herbarium 7(1): 211. . 1900.

Synonyms & Misapplications:
Cogswellia piperi (Coult. & Rose) M.E. Jones
Additional Resources:

PNW Herbaria: Specimen records of Lomatium piperi in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Lomatium piperi checklist entry.

E-Flora BC: Lomatium piperi atlas page.

CalPhotos: Lomatium piperi photos.

USDA Plants: Lomatium piperi information.

10 photographs:
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