[Arnicas of the Cascade Mountains of Oregon and Washington]

Clasping Arnica, Columbia Gorge Arnica, Streambank Arnica, Streambank Leopardbane

Arnica lanceolata ssp. prima

Synonyms: Arnica amplexicaulis, Arnica amplexicaulis ssp. amplexicaulis, Arnica amplexicaulis ssp. genuina, Arnica amplexicaulis ssp. prima, Arnica amplexicaulis var. amplexicaulis, Arnica amplexicaulis var. piperi, Arnica amplexicaulis var. prima, Arnica amplexifolia ssp. prima, Arnica lanceolata, Arnica lanceolata ssp. prima, Arnica mollis var. aspera

Clasping Arnica, Columbia Gorge Arnica, Streambank Arnica, Streambank Leopardbane: Arnica lanceolata ssp. prima (Synonyms: Arnica amplexicaulis, Arnica amplexicaulis ssp. amplexicaulis, Arnica amplexicaulis ssp. genuina, Arnica amplexicaulis ssp. prima, Arnica amplexicaulis var. amplexicaulis, Arnica amplexicaulis var. piperi, Arnica amplexicaulis var. prima, Arnica amplexifolia ssp. prima, Arnica lanceolata, Arnica lanceolata ssp. prima, Arnica mollis var. aspera)

A close-up of the flower head of streambank arnica as seen in moist meadows near Little Crater Lake, Mt. Hood National Forest........August 9, 2007.

Clasping Arnica, Columbia Gorge Arnica, Streambank Arnica, Streambank Leopardbane: Arnica lanceolata ssp. prima (Synonyms: Arnica amplexicaulis, Arnica amplexicaulis ssp. amplexicaulis, Arnica amplexicaulis ssp. genuina, Arnica amplexicaulis ssp. prima, Arnica amplexicaulis var. amplexicaulis, Arnica amplexicaulis var. piperi, Arnica amplexicaulis var. prima, Arnica amplexifolia ssp. prima, Arnica lanceolata, Arnica lanceolata ssp. prima, Arnica mollis var. aspera) - Involucral bracts of Clasping Arnica, Columbia Gorge Arnica, Streambank Arnica, Streambank Leopardbane: Arnica lanceolata ssp. prima (Synonyms: Arnica amplexicaulis, Arnica amplexicaulis ssp. amplexicaulis, Arnica amplexicaulis ssp. genuina, Arnica amplexicaulis ssp. prima, Arnica amplexicaulis var. amplexicaulis, Arnica amplexicaulis var. piperi, Arnica amplexicaulis var. prima, Arnica amplexifolia ssp. prima, Arnica lanceolata, Arnica lanceolata ssp. prima, Arnica mollis var. aspera)

Streambank arnica as seen along a dry watercourse across the Boundary Trail #1 in Dark Meadows, Dark Divide, Gifford Pinchot National Forest..........July 3, 2015. Note the 6 pairs of stem leaves and toothed margins to the leaves. There are no tufts of hairs at the tips of the bracts, so this can't be A. chamissonis.
Paul Slichter