Senecio flaccidus var. flaccidus
(Threadleaf Ragwort)
Senecio flaccidus, John Martin Reservoir State Park, Bent Co. 0041
Senecio flaccidus, John Martin Reservoir State Park, Bent Co. 0038
Senecio flaccidus, John Martin Reservoir State Park, Bent Co. 0042
Senecio flaccidus, John Martin Reservoir State Park, Bent Co. 0048
Senecio flaccidus, John Martin Reservoir State Park, Bent Co. 0053
| Scientific Name | Senecio flaccidus var. flaccidus | USDA PLANTS Symbol | SEFLF |
| Common Name | Threadleaf Ragwort, Threadleaf Groundsel | ITIS Taxonomic Serial No. | 530313 |
| Family | Asteraceae (Sunflower) | SEINet Reference |
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| Description |
Life zones and habitat: Plains and foothills (3500 to 6500 ft.); dry soils on plains, hillsides, mesas, and along washes.
Plant: Perennial with several arching to erect stems in clumps, 12 to 40 inches tall; stems and leaves covered (sometimes unevenly) with a dense layer of short, matted, woolly hairs (tomentose). Leaves: Alternate stem leaves, sessile or on small petioles; blades are narrowly linear and may be deeply pinnately-divided into linear-filiform segments each up to 1-3/8 inches long; leaf axils may have tufts of several small leaves (fascicles) Inflorescence: Showy clusters of 3 to 20 composite flower heads each about 1-1/2 inches across, with 8 to 21 yellow rays and many yellow disk florets; involucres are cylindrical to hemispherical, about 1/2-inch high with linear phyllaries having green or black tips; sometimes with 3 to 5 short bractlets immediately below the involucre. Bloom Period: May to October. References: "Flora of Colorado" by Jennifer Ackerfield, Flora of North America, American Southwest and SEINet. |
BONAP Distribution Map Map Color Key |
Colorado Status: Native |
© Tom Lebsack 2025
Banner photo: Castilleja rhexifolia and a brewing storm over the San Juan Mountains
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