Senecio aronicoides
Rayless ragwort, Rayless Ragwort
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Family: Asteraceae · Type: Herb · Native
Senecio aronicoides (Rayless ragwort) is a native California herb in the Asteraceae family, recognized by tall stature, typically no rays, and montane forest habitat.
Rayless ragwort is a California native perennial found in northwestern California, the Cascade Range, Sierra Nevada, Sacramento Valley, central western California, and Modoc Plateau in dry or drying sites within open woodland and montane forest at elevations of 800 to 3,020 meters. Flowering from April to July, this plant produces heads of disk flowers without ray flowers, forming clusters 15 to 30 millimeters wide with green or black-tipped involucral bracts. Growing 30 to 100 centimeters tall with a single stem that becomes increasingly glabrous, it develops from a button-like caudex with fleshy, fibrous roots. Its basal leaves are 7 to 20 centimeters long and 2 to 3 centimeters wide, varying from ovate to oblanceolate with minutely toothed edges that become smaller and more sessile toward the stem tip. The fruit is 1.5 to 2.5 millimeters long and glabrous.
Identification and appearance
Key characters: 26 sympatric species; key features are tall stature, typically no rays, and montane forest habitat
Habitat and range
Habitat: Dry or drying sites in open woodland, upper foothill, montane forest
Elevation: 800-3020 m
Outside California: southern Oregon
Bloom period
Senecio aronicoides blooms Apr-Jul.
How to tell it apart
vs Packera: Senecio has larger leaves (over 2.5 inches) and often black-tipped bracts; Packera has tiny leaves (under 1.5 inches) with green or reddish tips.; vs Sonchus: Senecio has yellow daisy flowers with a neat single row of bracts; Sonchus has dandelion-like flowers and milky sap when broken.; vs Dudleya: Senecio is in the sunflower family with daisy flowers; Dudleya is a succulent with thick fleshy leaves and star-shaped flowers.; vs Ericameria: Senecio has one main row of equal bracts around flower heads; Ericameria has 2-4 overlapping rows of unequal bracts.; vs Taraxacum: Senecio has branching stems with multiple flower heads; Taraxacum has leafless hollow stems with single dandelion-like heads.
Frequently asked questions
Is Senecio aronicoides native to California?
Yes. Senecio aronicoides is native to California (recorded as native).
When does Senecio aronicoides bloom?
Senecio aronicoides blooms Apr-Jul.
What plant family does Senecio aronicoides belong to?
Senecio aronicoides is in the Asteraceae family, genus Senecio.
What habitat does Senecio aronicoides grow in?
Senecio aronicoides grows in Dry or drying sites in open woodland, upper foothill, montane forest.
Related species
Other California species in the same genus, family, or bioregion.
Sources: Jepson eFlora · Index of California Plant Names · CalPhotos
Last updated 2026-10-07
Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Cal-IPC, and more.