The Genus Senecio of the daisy family (Family Asteraceae) includes ragworts and groundsels. The flower heads are normally rayed, completely yellow, and the heads are borne in branched clusters. Though of late the genus has been reviewed and split up, it still contains a vast number of species (about 1,500) of extremely wide form including leaf succulents, stem and tuber succulents, annuals, perennials, aquatic forms, climbers, shrubs and small trees.
Species
- Senecio actinella Greene -- Flagstaff ragwort
- Senecio amplectens Gray -- alpine groundsel, showy alpine groundsel, showy alpine ragwort
- Senecio ampullaceus Hook. -- Texas ragwort
- Senecio aphanactis Greene -- chaparral ragwort
- Senecio arizonicus Greene -- Arizona ragwort
- Senecio aronicoides DC. -- rayless ragwort
- Senecio astephanus Greene -- San Gabriel ragwort
- Senecio atratus Greene -- tall blacktip ragwort
- Senecio bicolor (Willd.) Todaro -- silver ragwort
- Senecio bigelovii Gray -- nodding ragwort
- Senecio blochmaniae Greene -- dune ragwort
- Senecio californicus DC. -- California ragwort
- Senecio cannabifolius Less. -- Aleutian ragwort
- Senecio cannabinifolius Hook. & Arn. -- hempleaf ragwort
- Senecio clarkianus Gray -- Clark's ragwort
- Senecio cleavelandii Greene
- Senecio clivorum Maxim. -- summer ragwort
- Senecio congestus (R. Br.) DC. -- clustered marsh ragwort, marsh leabane
- Senecio crassulus Gray -- meadow groundsel, thickleaf groundsel, thickleaf ragwort
- Senecio cynthiodes Greene
- Senecio elegans L. -- redpurple ragwort
- Senecio elmeri Piper -- Elmer's ragwort
- Senecio eremophilus Richards. -- desert groundsel, desert ragwort
- Senecio ertterae T.M. Barkl. -- Ertter's ragwort
- Senecio erucifolius L. -- hoary ragwort
- Senecio flaccidus Less. -- Douglas senecio, threadleaf groundsel, threadleaf ragwort
- Senecio fremontii Torr. & Gray -- dwarf mountain ragwort, Fremont's groundsel
- Senecio X hybridus (Willd.) Regel -- common ragwort, florist`s cineraria
- Senecio hydrophiloides Rydb. -- tall groundsel, tall groundwel
- Senecio hydrophilus Nutt. -- alkali marsh groundsel, water groundsel, water ragwort
- Senecio integerrimus Nutt. -- lamb-tongue ragwort, lambstongue groundsel, lambstongue ragwort
- Senecio jacobaea L. -- ragwort, stinking willie, tansy ragwort
- Senecio lemmonii Gray -- Lemmon groundsel, Lemmon's ragwort
- Senecio lucidus (Sw.) DC.
- Senecio lugens Richards. -- small blacktip ragwort
- Senecio lyonii Gray -- island senecio
- Senecio madagascariensis Poir. -- fireweed, Madagascar groundsel, Madagascar ragwort
- Senecio megacephalus Nutt. -- rocky ragwort
- Senecio millefolius Torrey and Gray
- Senecio mohavensis Gray -- Mohave groundsel, Mojave ragwort
- Senecio moresbiensis (Calder & Taylor) G.W. Douglas & G. Ruyle-Douglas -- cleftleaf ragwort
- Senecio multidentatus Schultz-Bip. ex Hemsl. -- Huachuca Mountain ragwort
- Senecio musiniensis Welsh -- Musinea ragwort
- Senecio neowebsteri Blake -- Olympic Mountain ragwort
- Senecio newcombei Greene -- Newcombe's ragwort
- Senecio parryi Gray -- mountain ragwort, Parry groundsel
- Senecio pattersonensis Hoover -- Mono groundsel, Patterson's senecio
- Senecio pseudo-arnica Less.
- Senecio pseudoarnica Less. -- seaside ragwort
- Senecio pudicus Greene -- bashful ragwort
- Senecio rapifolius Nutt. -- openwoods ragwort
- Senecio riddellii Torr. & Gray -- riddell groundsel, Riddell groundsel, Riddell ragwort, Riddell's ragwort, Sand groundsel
- Senecio rupestris Waldst. & Kit. -- rock ragwort
- Senecio sacramentanus Woot. & Standl. -- Sacramento ragwort
- Senecio schweinitizianus Nuttall
- Senecio scorzonella Greene -- Sierra groundsel, Sierra ragwort
- Senecio serra Hook. -- butterweed, butterweed groundsel, tall ragwort
- Senecio sheldonensis Porsild -- Mt. Sheldon ragwort
- Senecio silignus De Candolle
- Senecio soldanella Gray -- Colorado ragwort
- Senecio spartioides Torr. & Gray -- broom groundsel, broom-like ragwort, broomlike ragwort
- Senecio sphaerocephalus Greene -- ballhead ragwort, marsh groundsel
- Senecio squalidus L. -- oxford ragwort
- Senecio sylvatica Linnaeus
- Senecio sylvaticus L. -- woodland ragwort
- Senecio taraxacoides (Gray) Greene -- dandelion ragwort
- Senecio triangularis Hook. -- arrowleaf groundsel, arrowleaf ragwort
- Senecio viscosus L. -- sticky ragwort
- Senecio vulgaris L. -- common groundsel, old-man-in-the-Spring
- Senecio warnockii Shinners -- Warnock's ragwort
- Senecio wootonii Greene -- Wooton ragwort, Wooton's ragwort
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