Complete list of species
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| scientific name | common name(s) | image gallery |
| Senecio amplectens var. holmii | Holm's Ragwort Holm's Senecio | |
| Senecio ampullaceus | Texas Ragwort Texas Groundsel Texas Butterweed | |
| Senecio aphanactis | California Groundsel Chaparral Ragwort Rayless Ragwort | |
| Senecio arizonicus | Arizona Ragwort | |
| Senecio aronicoides | Rayless Ragwort | |
| Senecio astephanus | San Gabriel Ragwort | |
| Senecio atratus | Tall Blacktip Ragwort | |
| Senecio bigelovii | Nodding Ragwort Nodding Groundsel | |
| Senecio bigelovii var. bigelovii | Nodding Ragwort | |
| Senecio bigelovii var. hallii | Bigelow's Groundsel Nodding Ragwort | |
| scientific name | common name(s) | image gallery |
