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Senecio
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Senecio 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. 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.
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Encyclopedia
Senecio 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. 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 that feed on Senecio.
Common names
Selected species
Between its own cross species breeding and the horticulturalists, Senecio is perhaps the largest genus in the family Asteraceae.
- 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. Löve
- Senecio barbertonicus Klatt — Succulent Bush Senecio
- Senecio battiscombei
- Dendrosenecio battiscombei
- Senecio brasiliensis (Spreng.) Less. -- flor-das-almas
- Senecio cambrensis — Welsh groundsel, Welsh ragwort
- Senecio cineraria — Dusty miller
- Cineraria maritima
- Jacobaea maritima
- Othonna maritima
- Senecio congestus (R. Br.) DC. — Marsh ragwort, Clustered marsh ragwort, Marsh fleabane
- Cineraria palustris
- Othonna palustris
- Tephroseris palustris
- 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
- Senecio glaucus L. -- Jaffa groundsel
- Senecio haworthii -- woolly senecio
- Senecio iscoensis -- Hieron.
- Senecio jacobaea -- common ragwort, stinking willie, tansy ragwort;
- synonymous with Jacobaea vulgaris
- Senecio keniensis
- Senecio keniodendron -- Giant groundsel
- Dendrosenecio keniodendron
- Senecio keniophytum
- Senecio kleinia
- Senecio lamarckianus
- Senecio leucanthemifolius Poir. -- Coastal Ragwort
- Senecio littoralis
- Senecio mikanioides -- Cape Ivy, German Ivy
- Senecio obovatus Muhl. -- Roundleaf Ragwort
- Packera obovata (Muhl. ex Willd.)
- Senecio patagonicus
- Senecio pulcher
- Senecio rowleyanus -- String of pearls
- Senecio squalidus -- Oxford ragwort
- Senecio vaginatus
- Senecio vernalis -- Eastern groundsel
- Senecio viscosus -- sticky ragwort
- Senecio vulgaris -- common groundsel, old-man-in-the-spring
Formerly in Senecio
Nomina Nova
Senecio is or was, depending on the authority cited, the genus containing the most species within the family (Asteraceae) of flowering plants that contains the most genera. The cataloging of living things started centuries ago as a science of systematic naming based on a unique description of the living thing that was being named. Throughout the centuries since then, the science of naming has had plenty of problems including the lack of enough descriptive words (many species are named after people, for instance), mix-ups in the collected samples, plants and animals which propagate themselves in ways not easily managed by a catalog which assumed such things were stagnant. There has been several attempts to rename and reorganize these things more sensibly according to the new information provided by more modern technology and with the understanding that the plant and animal kingdoms are probably not going to be stable; that is exactly in a year the same way as they are now. Meanwhile, as the science of naming catches up to technology, knowing all of the names a species has had, and has been published as, is a part of finding the information about them; no matter who the authority is. The following genera contain species which used to be considered to be in the genus 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.
- 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.
- MonticaliaMonticalia befarioides...
C. Jeffrey - Nelsonianthus H. Rob. & Brettell
- Nesampelos B. Nord., nom. inval.
- Oldfeltia B. Nord. & Lundin
- Packera Á. Löve & D. Löve
- 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.
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