Aquatic and Wetland Vascular Plants of the Northern Great Plains
Senecio L. -- Ragwort
Erect annuals or perennials; leaves simple, entire to usually variously toothed or lobed, alternate, often petiolate at or near the base, sessile and commonly reduced upward. Heads radiate, few to many in one or more corymbiform to umbelliform clusters; involucral bracts in one series and essentially equal, not imbricate, sometimes with a few highly reduced bracts below, herbaceous throughout or scarious above; receptacle flat to convex, naked; ray florets pistillate, the ligules yellow; disk florets perfect, yellow; style branches flattened, truncate and puberulent at the tip. Achenes subterete, 5- to 10-nerved; pappus of numerous capillary bristles.
| Lead | Characteristic | Go To |
| 1 | Plants annual or biennial, hollow-stemmed; leaves basically all similar in shape. | S. congestus |
| 1 | Plants perennial, solid-stemmed; basal leaves differing in shape from cauline leaves. | S. pseudaureus |
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