Arrow-leaf Butterweed, Arrowleaf Groundsel, Arrowleaf Ragwort
Senecio triangularis var. triangularis
Synonym: Senecio triangularis var. angustifolius
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The photo at left 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. The photo at right shows arrow-leaf butterweed as seen along the Shorthorn Trail #9 at Shorthorn Creek in the Mt. Adams Wilderness..........August 24, 2008.
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The photo at left 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. The photo at right 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.
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.
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The photo at left shows arrow-leaf butterweed blooming along the Killen Creek Trail #113 at the East Fork Adams Creek crossing, Mount Adams Wilderness......August 4, 2022. Two photos at center and right of arrow-leaf butterweed as seen along Gotchen Creek, about 200 meters south of the Round the Mountain Trail #9, Gifford Pinchot National Forest, southeastern corner of Mt. Adams.........September 5, 2021.
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.
Arrowleaf butterweed still in bloom along streams along the Round the Mountain Trail #9 in Bird Creek Meadows, Mt. Adams..........October 12, 2014.
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Arrowleaf butterweed observed in bloom along the Bird Lake Trail on one of the upper forks of Crooked Creek, about one hundred meters downhill from the Round the Mountain Trail #9, Yakama Nation lands at Bird Creek Meadows, SE side of Mt. Adams......08-18-2023.
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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 in bloom in moist meadows above Killen Creek Meadows, Mt. Adams Wilderness......August 28, 2020.
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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