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Senecio
Genus of flowering plants From Wikipedia, the free encyclopedia
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Senecio /sɪˈniːʃi.oʊ/[2] is a genus of flowering plants in the daisy family (Asteraceae) that includes ragworts and groundsels.
Variously circumscribed taxonomically, the genus Senecio is one of the largest genera of flowering plants. Plants of the World Online currently accepts 1482 species.[1]
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Description
Morphology
The flower heads are normally rayed with the heads borne in branched clusters, and usually completely yellow, but green, purple, white and blue flowers are known as well.
In its current circumscription, the genus contains species that are annual or perennial herbs, shrubs, small trees, aquatics or climbers.[3]
Chemistry
Pyrrolizidine alkaloids are found in all Senecio species. These alkaloids serve as a natural biocides to deter or even kill animals that would eat them. Livestock generally do not find them palatable.[4] Senecio species are used as food plants by the larvae of some Lepidoptera species that have developed tolerance for these alkaloids.
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Taxonomy
Summarize
Perspective
The traditional circumscription of Senecio is artificial, being polyphyletic, even in its new circumscription which is based on genetic data.[5][6] Despite the separation of many species into other genera, the genus still contains c. 1,250 species and is one of the largest genera of flowering plants.[7]
As no morphological synapomorphies are known to determine which species belong to the genus or not, no exact species number is known. The genus has an almost worldwide distribution[5] and evolved in the mid- to late Miocene.[8]
Phylogeny
As of 2007, many genera and the whole tribe were in need of revision. Many species currently placed in the genus need to be transferred to other or new genera, and others have been retransferred to Senecio. In its new delimitation the genus is still not monophyletic.[5]
The following genera are currently accepted by Plants of the World Online, and contain species that are or have been included within Senecio.[5]
- Aetheolaena Cass.
- Antillanthus B.Nord.
- Barkleyanthus H.Rob. & Brettell
- Bethencourtia Choisy (synonym Canariothamnus B.Nord.)
- Brachyglottis J.R.Forst. & G.Forst.[9]
- Curio P.V.Heath
- Dauresia B.Nord. & Pelser
- Dendrophorbium C.Jeffrey
- Dendrosenecio (Hauman ex Hedberg) B.Nord. - Giant groundsels native to high-elevation areas of East Africa
- Dorobaea Cass.
- Dresslerothamnus H.Rob.
- Elekmania B.Nord.
- Hasteola Raf.
- Herreranthus B.Nord.
- Hubertia Bory
- Iocenes B.Nord.
- Jacobaea Mill.
- Leonis B.Nord.
- Ligularia Cass.
- Lundinia B.Nord.
- Mesogramma DC.
- Monticalia 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
- Robinsonia DC. (synonym Vendredia Baill.)
- 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.[10]
Etymology
The scientific name, Senecio, derives from the latin 'senex' which means "old man".
Selected species
- Senecio ampullaceus Hook. — Texas ragwort, Texas squaw-weed, Texas groundsel, clasping-leaf groundsel[11]
- Senecio angulatus L.f. — creeping groundsel
- Senecio antisanae Benth.
- Senecio arborescens
- Senecio barbertonicus Klatt — succulent bush senecio
- Senecio bigelovii A.Gray — nodding groundsel
- Senecio brasiliensis (Spreng.) Less. — flor-das-almas
- Senecio cambrensis Rosser — Welsh groundsel, Welsh ragwort
- Senecio candicans Wall. ex DC. — angel wings
- Senecio casapaltensis Ball (synonym Senecio sanmarcosensis H.Beltrán)
- Senecio crassissimus Humbert
- Senecio decaryi Humbert — Madagascar senecio
- Senecio elegans L. — purple groundsel
- Senecio falklandicus Hook.f.
- Senecio flaccidus Less. — Douglas senecio, threadleaf groundsel, threadleaf ragwort
- Senecio gallicus Vill. ex Chaix — French groundsel
- Senecio glaucus L. — Jaffa groundsel
- Senecio howeanus Belcher
- Senecio inaequidens DC. — South African ragwort
- Senecio iscoensis Hieron.
- Senecio keniophytum R.E.Fr.
- Senecio lamarckianus Bullock
- Senecio leucanthemifolius Poir. — coastal ragwort
- Senecio macroglossus DC. — Natal ivy, wax ivy
- Senecio madagascariensis Poir. — Madagascar ragwort
- Senecio neowbsteri S.F.Blake – Olympic Mountain groundsel
- Senecio oxyriifolius DC. (synonym Senecio tropaeolifolius) — false nasturtium
- Senecio patagonicus Hook. & Arn.
- Senecio pauciradiatus Belcher
- Senecio pokohinuensis (de Lange & B.G.Murray) de Lange — Mokohinau groundsel
- Senecio pulcher Hook. & Arn.
- Senecio scandens Buch.-Ham. ex D.Don — climbing Senecio
- Senecio squalidus L. — Oxford ragwort
- Senecio triangularis Hook. — arrowleaf groundsel
- Senecio vaginatus Hook. & Arn.
- Senecio vernalis Waldst. & Kit. — eastern groundsel
- Senecio viscosus L. — sticky ragwort
- Senecio vulgaris L. — common groundsel, old-man-in-the-spring
Formerly in Senecio (partial list)
- Brachyglottis greyi (as S. greyi)
- Pericallis × hybrida (as S. cruentus)
- Rugelia nudicaulis — Rugels ragwort
- Telanthophora grandifolia (Less.) H.Rob. & Brettell (as S. grandifolius Less.)
- Tephroseris papposa (Rchb.) Schur (as S. papposus)
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Distribution
The genus Senecio is distributed almost worldwide.[5] It is one of the few genera occurring in all five regions with a Mediterranean climate. Furthermore, species are found in mountainous regions, including tropical alpine-like areas.
See also
References
External links
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