Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to Montana and Utah.
Habitat: Sagebrush-ponderosa pine woodland to moderate elevations in the mountains.
Flowers: May-June
Origin: Native
Conservation Status: Not of concern
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PNW Herbaria: Specimen records of Lathyrus lanszwertii in the Consortium of Pacific Northwest Herbaria database.
WA Flora Checklist: Lathyrus lanszwertii checklist entry.
E-Flora BC: Lathyrus lanszwertii atlas page.
CalPhotos: Lathyrus lanszwertii photos.
USDA Plants: Lathyrus lanszwertii information.