Thinpetal Larkspur, Thin-petal Larkspur, Upland Larkspur
Delphinium lineapetalum
Synonyms: Delphinium lineapetalum, Delphinium lineapetalum ssp. klickitatense

Thinpetal larkspur as seen along the Iron Creek Trail #1351 in the Wenatchee National Forest...........July 9, 2010. Note the long, gland-tipped hairs spreading from the pedicel, the black lined markings on the notched petals, and the stamens which are not hidden by the petals.
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Additional photos of thinpetal larkspur as seen along the Iron Creek Trail #1351 in the Wenatchee National Forest...........July 9, 2010.
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Thinpetal larkspur observed on BLM lands along Box Canyon Road about one-quarter of a mile east of the gated trailhead on Simcoe Mountains Unit of the Klickitat Wildlife Area lands.....May 22, 2022.
Paul Slichter