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Senecio triangularis (Arrowleaf ragwort)
Cox, Fran

Senecio triangularis

Senecio triangularis Hook.

Arrowleaf Ragwort, Arrowleaf Groundsel

Asteraceae (Aster Family)

Synonym(s): Senecio gibbsonsii, Senecio triangularis var. angustifolius


USDA Native Status: L48 (N), AK (N), CAN (N)

Broadly or narrowly triangular or arrowhead-shaped leaves, with many sharp teeth on edges, grow on several leafy stems that bear yellow flower heads in a branched, flattish cluster at top.

As indicated by the common and technical names, the triangular leaves are distinctive.


From the Image Gallery

8 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb , Subshrub
Size Notes: Up to about 6 feet tall, often much shorter.
Leaf: Green
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.

Bloom Information

Bloom Color: Yellow
Bloom Time: Jun , Jul , Aug , Sep


USA: AK , CA , CO , ID , MT , NM , NV , OR , UT , WA , WY
Canada: AB , BC , NT
Native Distribution: Alaska and western Canada; south to southern California, Arizona, and New Mexico.
Native Habitat: Stream banks and other moist places in the mountains.

Growing Conditions

Water Use: High
Light Requirement: Part Shade
CaCO3 Tolerance: Medium


Conspicuous Flowers: yes

Find Seed or Plants

View propagation protocol from Native Plants Network.

National Wetland Indicator Status

This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Senecio triangularis in USDA Plants
FNA: Find Senecio triangularis in the Flora of North America (if available)
Google: Search Google for Senecio triangularis


Record Modified: 2023-01-16
Research By: TWC Staff

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