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Senecio triangularis Hook.
Arrowleaf Ragwort, Arrowleaf Groundsel
Asteraceae (Aster Family)
Synonym(s): Senecio gibbsonsii, Senecio triangularis var. angustifolius
USDA Symbol: SETR
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
Plant CharacteristicsDuration: Perennial
Habit: Herb , Subshrub
Size Notes: Up to about 6 feet tall, often much shorter.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.
Bloom InformationBloom Color: Yellow
Bloom Time: Jun , Jul , Aug , Sep
DistributionUSA: 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 ConditionsWater Use: High
Light Requirement: Part Shade
CaCO3 Tolerance: Medium
BenefitConspicuous Flowers: yes
Find Seed or Plants
View propagation protocol from Native Plants Network.
National Wetland Indicator Status
Web ReferenceWebref 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 resourcesUSDA: Find Senecio triangularis in USDA Plants
FNA: Find Senecio triangularis in the Flora of North America (if available)
Google: Search Google for Senecio triangularis
MetadataRecord Modified: 2023-01-16
Research By: TWC Staff