- Senecio actinella, Flagstaff ragwort
- Senecio aegyptius
- Senecio albogilvus, White alpine groundsel
- Senecio amplectens, Showy alpine ragwort
- Senecio ampullaceus, Texas ragwort
- Senecio amygdalifolius
- Senecio andicola
- Senecio anethifolius
- Senecio angulatus
- Senecio angustiradiatus
- Senecio aphanactis, Chaparral ragwort
- Senecio aquaticus, Marsh Ragwort
- Senecio arborescens
- Senecio arenarius
- Senecio arizonicus, Arizona ragwort
- Senecio aronicoides, Rayless ragwort
- Senecio articulatus, Cacalia articulata Lf
- Senecio astephanus, San Gabriel ragwort
- Senecio atratus, Tall blacktip ragwort
- Senecio atropurpureus
- Senecio aureus
- Senecio australis
- Senecio barkhausioides
- Senecio barkleyi
- Senecio bathurstianus, Erechtites bathurstiana Dc
- Senecio behrianus
- Senecio bigelovii, Nodding ragwort
- Senecio bipinnatisectus, Commonwealth Weed
- Senecio biserratus, Jagged fireweed
- Senecio blochmaniae, Dune ragwort
- Senecio bolanderi
- Senecio brasiliensis
- Senecio brenesii
- Senecio brigalowensis
- Senecio burchellii, Molteno Disease Plant
- Senecio californicus, California ragwort
- Senecio cambrensis, Welsh Groundsel
- Senecio campylocarpus, Bulging fireweed
- Senecio candelariae
- Senecio cannabifolius, Aleutian ragwort
- Senecio cedrosensis
- Senecio chenopodioides
- Senecio chirripoensis
- Senecio cineraria, Silver Ragwort
- Senecio clarkianus, Clarks ragwort
- Senecio condylus
- Senecio conferruminatus
- Senecio congestus, Marsh fleabane
- Senecio cooperi
- Senecio copeyensis
- Senecio costaricensis
- Senecio crassiflorus, Cineraria crassiflora Poir
- Senecio crassulus, Thickleaf ragwort
- Senecio crataegifolius
- Senecio cunninghamii
- Senecio daltonii
- Senecio depressicola
- Senecio diaschides, Erect Groundsel
- Senecio dimorphophyllus
- Senecio distalilobatus
- Senecio dolichocephalus
- Senecio doria, Golden Ragwort
- Senecio doronicum, Chamois Ragwort
- Senecio douglasii
- Senecio durandii
- Senecio eboracensis
- Senecio elegans, Purple Groundsel
- Senecio elmeri, Elmers ragwort
- Senecio eremicola
- Senecio eremophilus, Desert ragwort
- Senecio ertterae, Ertters ragwort
- Senecio erucifolius, Hoary Ragwort
- Senecio esleri
- Senecio euclaensis
- Senecio eurycephalus
- Senecio evansianus
- Senecio extensus, Subalpine fireweed
| - Senecio firmipes
- Senecio flaccidus, Threadleaf ragwort
- Senecio formosanus
- Senecio fremontii, Dwarf mountain ragwort
- Senecio gallicus, French Groundsel
- Senecio garlandii
- Senecio gawlerensis
- Senecio georgianus, Grey fireweed
- Senecio gibbonsii
- Senecio gilbertii
- Senecio glabellus
- Senecio glabrescens
- Senecio glastifolius, Woad-leaved Ragwort
- Senecio glomeratus, Purple fireweed
- Senecio glossanthus, Slender Groundsel
- Senecio grandiflorus, Purple Ragwort
- Senecio grandifolius
- Senecio gregorii, Annual Yellow-top
- Senecio gunnii, Mountain fireweed
- Senecio gypsicola
- Senecio halophilus
- Senecio hamersleyensis
- Senecio hansweberi
- Senecio harfordii
- Senecio helichrysoides
- Senecio heterogamus
- Senecio hieracioides
- Senecio hispidissimus, Coarse fireweed
- Senecio hispidulus, Rough fireweed
- Senecio hooglandii
- Senecio howeanus
- Senecio huachucanus
- Senecio hydrophiloides, Tall groundsel
- Senecio hydrophilus, Water ragwort
- Senecio hypoleucus
- Senecio inaequidens, Narrow-leaved Ragwort
- Senecio integerrimus, Lambstongue ragwort
- Senecio integrifolius
- Senecio interpositus
- Senecio jacobaea, Common Ragwort
- Senecio juniperinus
- Senecio kuanshanensis
- Senecio laceratus, Erechtites lacerata FMuell
- Senecio lacustrinus
- Senecio lageniformis
- Senecio lanibracteus
- Senecio laticostatus, Erechtites arguta var microcephala Benth
- Senecio lemmonii, Lemmons ragwort
- Senecio leptocarpus, Western groundsel
- Senecio leucanthemifolius
- Senecio leucoglossus
- Senecio linearifolius, Fireweed Groundsel
- Senecio longicollaris
- Senecio longilobus
- Senecio longipilus
- Senecio lugens, Small blacktip ragwort
- Senecio lyonii, Island senecio
- Senecio macranthus
- Senecio macrocarpus
- Senecio macroglossus
- Senecio madagascariensis, Madagascar ragwort
- Senecio magnificus
- Senecio megacephalus, Rocky ragwort
- Senecio megaglossus
- Senecio megaphyllus
- Senecio microbasis, Narrow fireweed
- Senecio minimus, Shrubby fireweed
- Senecio mohavensis, Mojave ragwort
- Senecio morrisonensis
- Senecio multicaulis
- Senecio multivenius
- Senecio murrayanus
- Senecio musiniensis, Musinea ragwort
- Senecio nemorensis, Broad-leaved Ragwort
- Senecio neomexicanus
- Senecio neowebsteri, Olympic Mountain ragwort
- Senecio nigrapicus
| - Senecio niveoplanus
- Senecio nudiusculus
- Senecio obovatus
- Senecio oederiifolius
- Senecio oerstedianus
- Senecio oldfieldii
- Senecio oreganus
- Senecio ovatus, Wood Ragwort
- Senecio papillosus
- Senecio parasiticus
- Senecio parryi, Mountain ragwort
- Senecio pattersonensis, Mono ragwort
- Senecio pauciradiatus
- Senecio pauperculus
- Senecio pectinatus
- Senecio phanerandrus
- Senecio phelleus
- Senecio picridioides
- Senecio pilosicristus
- Senecio pinnatifolius, Variable Groundsel
- Senecio pinnulatus
- Senecio plattensis
- Senecio platylepis
- Senecio prenanthoides, Common fireweed
- Senecio primulaefolius
- Senecio productus
- Senecio pseudaureus
- Senecio pseudoarnica, Seaside ragwort
- Senecio psilocarpus, Swamp fireweed
- Senecio psilophyllus
- Senecio pterophorus, Rough Senecio
- Senecio pudicus, Bashful ragwort
- Senecio quadridentatus, Cotton fireweed
- Senecio queenslandicus
- Senecio ramosissimus
- Senecio rapifolius, Openwoods ragwort
- Senecio riddellii, Riddells ragwort
- Senecio rowleyanus, String of beads
- Senecio runcinifolius, Tall Groundsel
- Senecio sacramentanus, Sacramento ragwort
- Senecio scabrellus
- Senecio scandens
- Senecio scorzonella, Sierra ragwort
- Senecio serra, Tall ragwort
- Senecio serratiformis
- Senecio sheldonensis, Mt Sheldon ragwort
- Senecio smithii, Magellan Ragwort
- Senecio soldanella, Colorado ragwort
- Senecio spanomerus
- Senecio spartaceus
- Senecio spartioides, Broom-like ragwort
- Senecio spathulatus
- Senecio sphaerocephalus, Ballhead ragwort
- Senecio squalidus, Oxford Ragwort
- Senecio squarrosus, Leafy fireweed
- Senecio streptothamnus
- Senecio sylvaticus, Heath Groundsel
- Senecio taitoensis
- Senecio taitungensis
- Senecio tamoides
- Senecio taraxacoides, Dandelion ragwort
- Senecio tarokoensis
- Senecio tasmanicus
- Senecio tenuiflorus, Erechtites tenuiflora Dc
- Senecio toiyabensis
- Senecio triangularis, Arrowleaf ragwort
- Senecio tuberculatus
- Senecio vagus
- Senecio velleioides
- Senecio vernalis, Eastern Groundsel
- Senecio viscosus, Sticky Groundsel
- Senecio vulgaris, Groundsel
- Senecio warnockii, Warnocks ragwort
- Senecio warrenensis
- Senecio wootonii, Wootons ragwort
- Senecio x orarius
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