Senecio

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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. Some species produce natural pesticides (especially alkaloids) to deter or even kill animals that would eat them.

Senecio species are used as food plants by the larvae of some Lepidoptera species - see list of Lepidoptera which feed on Senecio.

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 aquaticus Hill -- marsh 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, Bigelow grounsel
• Senecio blochmaniae Greene -- dune ragwort
• ''Senecio brasiliensis
• Senecio californicus DC. -- California ragwort
• Senecio cannabifolius Less. -- Aleutian ragwort
• Senecio cannabinifolius Hook. & Arn. -- hempleaf ragwort
• Senecio cineraria DC. -- Dusty miller
• Senecio citriformis -- Blue Seaweed
• 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 crassissimus Humbert -- vertical leaf
• Senecio crassulus Gray -- meadow groundsel, thickleaf groundsel, thickleaf ragwort
• Senecio cynthiodes Greene
• Senecio doria L. -- golden ragwort
• Senecio eboracensis Abbott & Lowe -- York groundsel
• 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 fluviatilis Wallr. -- broad-leaved ragwort
• Senecio fremontii Torr. & Gray -- dwarf mountain ragwort, Fremont's groundsel
• Senecio glastiflorus L. f. -- purple ragwort
• Senecio hydrophiloides Rydb. -- tall groundsel, tall groundsel
• Senecio hydrophilus Nutt. -- alkali marsh groundsel, water groundsel, water ragwort
• Senecio integerrimus Nutt. -- lamb-tongue ragwort, lambstongue groundsel, lambstongue ragwort
• Senecio inaequidens DC. -- narrow-leaved ragwort
• Senecio jacobaea L. -- ragwort, stinking willie, tansy ragwort
• Senecio lemmonii Gray -- Lemmon groundsel, Lemmon's ragwort, Lemmon's butterweed
• 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

A Senecio species at Longwood Gardens