Senecio atratus

(Tall Black-tip Ragwort)

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Senecio atratus, Golden Horseshoe, Breckenridge 9220/9232

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Senecio atratus, Golden Horseshoe, Breckenridge 9241

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Senecio atratus, Hoosier Pass, Park Co. 4404

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Senecio atratus, Blue Lakes, Summit Co 1216

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Upper leaf surface, Senecio atratus, Golden Horseshoe, Breckenridge 9238

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Lower leaf surface, Senecio atratus, Golden Horseshoe, Breckenridge 9238

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Senecio atratus, Golden Horseshoe, Breckenridge 9238

Scientific Name Senecio atratus USDA PLANTS Symbol SEAT
Common Name Tall Black-tip Ragwort ITIS Taxonomic Serial No. 36101
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Foothills to alpine (7000 to 13200 ft.); roadsides, along trails, rocky areas.
Plant: Erect perennial 14 to 32 inches tall, single or multiple stout, hairy, ribbed stems, in clumps.
Leaves: Hairy, oblong-ovate to oblanceolate with pointed tips and shallowly dentate edges, 4 to 12 inches long, petiolate; basal leaves angled upward, stem leaves are alternate.
Inflorescence: Small composite flower heads about 1/2-inch across in large clusters of 20 to 60 heads; about 5 thin yellow rays, 10 to 12 orange disk florets; light green phyllaries below with black tips.
Bloom Period: July to September.
References: "Flora of Colorado" by Jennifer Ackerfield, SEINet and American Southwest.
BONAP Distribution Map

Colorado Status:
Native

© Tom Lebsack 2022

Banner photo: Ten Mile Range and Rhodiola integrifolia (King’s Crown) in Summit County