Senecio

# Overview
Senecio (/snii.o/)
is a genus of the daisy family (Asteraceae) that includes ragworts and groundsels. The flower heads are normally rayed, completely yellow, and the heads are borne in branched clusters. Senecio is one of the largest genera of flowering plants, and despite the separation of many species into other genera it still contains Template:Circa species of varied form, including leaf, stem and tuber succulents, annuals, perennials, aquatics, climbers, shrubs and small trees. Some species produce natural biocides (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 that feed on Senecio.
Pyrrolizidine alkaloids have been found in Senecio nemorensis and in Senecio cannabifolius var. integrilifolius
The name means "old man".

# Selected species
- Senecio ampullaceus  Texas ragwort, Texas squaw-weed, Texas groundsel, clasping-leaf groundsel
- Senecio angulatus L.f.  Creeping groundsel
- Senecio antisanae
- Senecio arborescens
- Senecio aureus L.  Golden Ragwort
Packera aurea (L.) A. & D. Love
- Packera aurea (L.) A. & D. Love
- Senecio barbertonicus Klatt  Succulent Bush Senecio
- Senecio battiscombei
Dendrosenecio battiscombei
- Dendrosenecio battiscombei
- Senecio biglovii - Nodding groundsel
- Senecio brasiliensis (Spreng.) Less.  flor-das-almas
Cineraria brasiliensis
- Cineraria brasiliensis
- Senecio cambrensis  Welsh groundsel, Welsh ragwort
- Senecio congestus (R. Br.) DC.  Marsh ragwort, Clustered marsh ragwort, Marsh fleabane
Cineraria palustris
Othonna palustris
Tephroseris palustris
- Cineraria palustris
- Othonna palustris
- Tephroseris palustris
- Senecio douglasii - Threadleaf groundsel
- Senecio eboracensis Abbott & Lowe  York groundsel
- Senecio flaccidus Less.  Douglas senecio, threadleaf groundsel, threadleaf ragwort
- Senecio gallicus Chaix  Southern Ragwort
- Senecio glabellus Poir.  Butterweed
Packera glabella (Poir) C. Jeffrey
- Packera glabella (Poir) C. Jeffrey
- Senecio glaucus L.  Jaffa groundsel
- Senecio haworthii  Woolly senecio
- Senecio iscoensis  Hieron.
- Senecio jacobaea  Now classed as a separate genus with 29 species.
- Senecio keniensis
Dendrosenecio keniensis
- Dendrosenecio keniensis
- Senecio keniodendron  Giant groundsel
Dendrosenecio keniodendron
- Dendrosenecio keniodendron
- Senecio keniophytum
- Senecio kleinia
Kleinia neriifolia
- Kleinia neriifolia
- Senecio lamarckianus
- Senecio leucanthemifolius Poir.  Coastal Ragwort
- Senecio littoralis
- Senecio mikanioides  Cape Ivy, German Ivy
Delairea odorata
- Delairea odorata
- Senecio obovatus Muhl.  Roundleaf Ragwort
Packera obovata (Muhl. ex Willd.)
- Packera obovata (Muhl. ex Willd.)
- Senecio patagonicus
- Senecio pulcher
- Senecio rowleyanus  String of pearls
- Senecio sanmarcosensis
- Senecio scandens  German Ivy
- Senecio squalidus  Oxford ragwort
- Senecio triangularis - Arrowleaf groundsel
- Senecio vaginatus
- Senecio vernalis  Eastern groundsel
- Senecio viscosus  Sticky ragwort
- Senecio vulgaris  Common groundsel, old-man-in-the-spring
Formerly in Senecio
- Brachyglottis greyi (as S. greyi)
- Florist's Cineraria, Pericallis  hybrida (as S. cruentus)
- Rugelia nudicaulis  Rugels ragwort

# Synonyms
The following genera contain species that are or have been included within Senecio.
Probable synonyms:
- Antillanthus B. Nord.
- Barkleyanthus H. Rob. & Brettell
- Brachyglottis J. R. Forst. & G. Forst.
- Canariothamnus B. Nord.
- Dauresia B. Nord. & Pelser
- Dendrophorbium C. Jeffrey
- Dendrosenecio (Hauman ex Hedberg) B. Nord. - Giant groundsels
- Dorobaea Cass.
- Dresslerothamnus H. Rob.
- Elekmania B. Nord.
- Herreranthus B. Nord.
- Hubertia Bory
- Iocenes B. Nord.
- Jacobaea Mill.
- Lasiocephalus Willd. ex Schltdl.
- Leonis B. Nord.
- Lundinia B. Nord.
- Mesogramma DC.
- Monticalia C. Jeffrey
- Nelsonianthus H. Rob. & Brettell
- Nesampelos B. Nord., nom. inval.
- Oldfeltia B. Nord. & Lundin
- Packera A. Love & D. Love
- Pentacalia Cass.
- Pippenalia McVaugh
- Pittocaulon H. Rob. & Brettell
- Pojarkovia Askerova
- Psacaliopsis H. Rob. & Brettell
- Pseudogynoxys (Greenm.) Cabrera
- Pseudojacobaea (Hook. f.) R. Mathur
- Roldana La Llave
- Sinosenecio B. Nord.
- Synotis (C. B. Clarke) C. Jeffrey & Y. L. Chen
- Telanthophora H. Rob. & Brettell
- Tephroseris (Rchb.) Rchb.
- Zemisia B. Nord.