[Butterweeds & Groundsels: The Genera Packera and Senecio in Mt. Adams Country]

Arrow-leaf Butterweed, Arrowleaf Ragwort

Senecio triangularis

Synonyms: Senecio triangularis var. angustifolius, Senecio triangularis var. triangularis

Arrow-leaf Butterweed: Senecio triangularis var. triangularis

The photo above shows arrow-leaf butterweed as seen at Island Springs on the east side of Mt. Adams.............August 12, 2006. Note the narrowly triangular leaves with serrate margins.

Arrow-leaf Butterweed: Senecio triangularis var. triangularis

The photo above shows a close-up view from above of the flowerhead of arrow-leaf butterweed. 6-8 narrow ray flowers typically line theee outside of the narrow, central cluster of disk flowers. Photographed in meadows along Crofton Creek, along the Crofton Ridge Trail #73.......July 16, 2006.

Arrow-leaf Butterweed: Senecio triangularis var. triangularis

The photo above shows a close-up of the involucral bracts of arrow-leaf butterweed. Photographed in meadows along Crofton Creek, along the Crofton Ridge Trail #73........July 16, 2006. Note that the narrow bracts are glabrous with only a few of them tipped with a dark spot.

Stem leaf of Arrow-leaf Butterweed: Senecio triangularis var. triangularis

Stem leaf of Arrow-leaf Butterweed: Senecio triangularis var. triangularis

The two photos above show different arrowhead-shaped leaves of arrow-leaf butterweed. Photographed in meadows along Crofton Creek, along the Crofton Ridge Trail #73.......July 16, 2006.

Arrow-leaf Butterweed: Senecio triangularis var. triangularis

The photo above shows arrow-leaf butterweed as seen along the Shorthorn Trail #9 at Shorthorn Creek in the Mt. Adams Wilderness..........August 24, 2008.

Arrow-leaf Butterweed: Senecio triangularis var. triangularis

Arrowleaf butterweed blooming in wetlands along the Round the Mountain Trail #9 in Bird Creek Meadows at the southeast side of Mount Adams...........August 13, 2013.

Arrow-leaf Butterweed, Arrowleaf Ragwort: Senecio triangularis (Synonyms: Senecio triangularis var. angustifolius, Senecio triangularis var. triangularis)

Arrowleaf butterweed still in bloom along streams along the Round the Mountain Trail #9 in Bird Creek Meadows, Mt. Adams..........October 12, 2014.

Arrow-leaf Butterweed: Senecio triangularis var. triangularis - Arrow-leaf Butterweed: Senecio triangularis var. triangularis and Lewis' Monkeyflower: Mimulus lewisii

Arrow-leaf butterweed as seen along the Round the Mt. Trail #9 to the east of its intersection with the Shorthorn Trail #16 on the south side of Mt. Adams.........August 31, 1996. Note the narrowly triangular leaves with serrate margins.

Arrow-leaf Butterweed, Arrowleaf Ragwort: Senecio triangularis (Synonyms: Senecio triangularis var. angustifolius, Senecio triangularis var. triangularis) - Arrow-leaf Butterweed, Arrowleaf Ragwort: Senecio triangularis (Synonyms: Senecio triangularis var. angustifolius, Senecio triangularis var. triangularis) - Arrow-leaf Butterweed, Arrowleaf Ragwort: Senecio triangularis (Synonyms: Senecio triangularis var. angustifolius, Senecio triangularis var. triangularis)

Arrowleaf groundsel blooming at left and center along upper Crooked Creek on the south side of Mt. Adams, Bird Creek Meadows...........September 2, 2017. The photo at right shows arrowleaf groundsel blooming along the Round the Mt. Trail #9 at one of the west forks of Crooked Creek in Bird Creek Meadows, Mt. Adams.........August 13, 2017.

Paul Slichter