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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. 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
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Between its own cross species breeding and the horticulturalists, Senecio is perhaps the largest genus in the family Asteraceae.[4]
- Senecio ampullaceus - Texas ragwort, Texas squaw-weed, Texas groundsel, clasping-leaf groundsel[5]
- Senecio angulatus L.f. - Creeping groundsel
- Senecio antisanae
- Senecio arborescens
- Senecio aureus L. - Golden Ragwort[6]
- 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; [7][8]
- 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
I have every day been figuring to myself the occupations of my pupil Solander, now putting his collection in order, having first arranged and numbered his plants, in parcels, according to the places where they were gathered, and then written upon each specimen its native country and appropriate number. I then fancied him throwing the whole into classes, putting aside and naming such as were already known; ranging others under known genera, with specific differences, and distinguishing by new names and definitions such as formed new genera, with their species. Thus, thought I, the world will be delighted and benefited by all these discoveries; and the foundations of true science will be strengthened, so as to endure through all generations!
-Extract from letter written by Linnaeus to John Ellis[9] |
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.[10] 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.[11][9]
Probable synonyms:
References
- ^ Purdue University, School of Veterinary Medicine. "24. GROUNDSEL, RAGWORT" (HTML). Animal Disease Diagnostic Lab, Plants by Type. Purdue University. Retrieved on 2008-02-09.
- ^ Botanic Garden and Botanical Museum Berlin-Dahlem. "Details for: Senecio" (HTML). Euro+Med PlantBase. Freie Universität Berlin. Retrieved on 2008-01-27.
- ^ Flora of North America. "Chinese Plant Names Senecio L." (HTML). Chinese Plant Names. Retrieved on 2008-02-27.
- ^ Bailey, Liberty Hyde (1917). "Senecio" (HTML). The Standard Cyclopedia of Horticulture: A Discussion for the Amateur, and ... (6 ed.). The Macmillan Company. pp. 3639. http://books.google.com/books-id=PpQDAAAAMAAJ&pg=PA3149&lpg=PA3149.
- ^ Sean Claes (2007-04-16). "Proceed With Caution" (HTML). Kyle, Texas Daily Photo. Retrieved on 2008-04-10.
- ^ Connecticut Botanical Society (November 13, 2005). "Golden Ragwort" (HTML). Connecticut Wildflowers. Retrieved on 2008-02-09. "Golden Ragwort is one of three species of ragwort in Connecticut, all with similar flowers."
- ^ M. Grieve (1931). "Ragwort" (HTML). A Modern Herbal. © Copyright Protected 1995-2008 Botanical.com.
- ^ "Tansy Ragwort" (HTML). Written Findings of the State Noxious Weed Control Board. Washington State Department of Agriculture. Retrieved on 2008-02-09.
- ^ a b Edgar, E.; H. E. Connor (1983). "Nomina Nova III, 1977-1982" (PDF). New Zealand Journal of Botany 21: 421-441. 0028-825X/83/2104-0421. http://www.nzjf.org/free_issues/NZJF31_3_1986/8B94A164-BF7A-4A5B-A45B-3ACE982D0C7C.pdf. Retrieved on 10 April 2008.
- ^ Zimmer, Carl (June 2008). "What Is A Species-" (HTML). Scientific American. Retrieved on 2008-06-29.
- ^ Pelser, Pieter B; Nordenstam, Bertil; Kadereit, Joachim W.; Watson, Linda E. (November 2007). "An ITS phylogeny of tribe Senecioneae (Asteraceae) and a new delimitation of Senecio L.". Taxon (International Association for Plant Taxonomy (IAPT)) 56 (4): 1077-14E(-1062). http://www.ingentaconnect.com/content/iapt/tax/2007/00000056/00000004/art00009. Retrieved on 29 June 2008.
- ^ Germplasm Resources Information Network (GRIN) (2007-05-04). "Genus: Senecio L." (HTML). Taxonomy for Plants. USDA, ARS, National Genetic Resources Program, National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved on 2008-02-27.
External links
 Media related to Senecio at Wikimedia Commons- Natural Resources Conservation Service (NRCS). "PLANTS Profile, Senecio L." (HTML). The PLANTS Database. United States Department of Agriculture. Retrieved on 2008-03-06.
- Germplasm Resources Information Network (GRIN) (2005-10-26). "Genus: Senecio L." (HTML). Taxonomy for Plants. USDA, ARS, National Genetic Resources Program, National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved on 2008-03-06.
- Germplasm Resources Information Network (GRIN) (2005-10-26). "GRIN Species Records of Senecio" (HTML). Taxonomy for Plants. USDA, ARS, National Genetic Resources Program, National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved on 2008-03-06.
- Integrated Taxonomic Information System Organization (ITIS) (20 December 2007). "Senecio L." (HTML). Integrated Taxonomic Information System on-line database. Retrieved on 2008-02-23.
- Botanic Garden and Botanical Museum Berlin-Dahlem. "Details for: Senecio" (HTML). Euro+Med PlantBase. Freie Universität Berlin. Retrieved on 2008-03-06.
- Missouri Botanical Garden (1753). "Seneco L." (HTML). Tropicos Nomenclatural Data Base. Retrieved on 2008-03-27.
- Royal Botanic Garden Edinburgh. "Flora Europaea Search Results" (HTML). Retrieved on 2008-03-06.
- Flora of Israel Online. "Search Results For 'senecio'" (HTML). Hebrew University of Jerusalem. Retrieved on 2008-03-06.
- Jerusalem Botanical Gardens. "LIST OF ALL PLANTS NAMES -WITH PHOTO S" (HTML). Retrieved on 2008-03-06.
- Flora of North America. Family List: 215. Senecio Linnaeus. 20. pp. 540,541, 542, 543, 544, 545, 570, 615. http://www.efloras.org/florataxon.aspx-flora_id=1&taxon_id=130085. Retrieved on 6 March 2008.
- Cyrille Chatelain, Laurent Gautier, Raoul Palese. "Senecio L." (HTML). African Flowering Plants Database. Conservatoire et Jardin botaniques de la Ville de Genčve. Retrieved on 2008-03-06.
- Instituto Darwinion. "Asteraceae" (PDF) (in Spanish). Catálogo de las Plantas Vasculares de la República Argentina. II 255. Universidad de Buenos Aires. Retrieved on 2008-03-06.
- Helen Coleman, FloraBase: Flora of Western Australia (1997-06-18). "search term: Senecio" (HTML). Flora Descriptions. Government of Western Australia. Retrieved on 2008-03-06.
- Landcare Research. "Senecio L." (HTML). Flora of New Zealand: Taxa. Landcare Research Allan Herbarium and New Zealand Plant Names Database. Retrieved on 2008-04-01.
- "Search for:genus:Senecio" (HTML). Species Information. Calflora - 1700 Shattuck Ave. #198, Berkeley, CA 94709. Retrieved on 2008-02-09.
- Flora of Chile. Volume 4 Asteraceae Senecio L.. 4. http://www.efloras.org/web_page.aspx-flora_id=60&page_id=1094. Retrieved on 6 March 2008.
- Dr. Richard Wunderlin or Dr. Bruce Hansen (2006). "Search Results For Search String: Senecio" (HTML). Atlas of Florida Vascular Plants. Institute for Systematic Botany. Retrieved on 2008-03-06.
- "Asteraceae" (HTML) (in Spanish). Primera página de la especie. Malezas de México. Retrieved on 2008-03-06.
- PlantNET - The Plant Information Network System of Botanic Gardens Trust. "Search terms: Senecio" (HTML). Botanic Gardens Trust. Retrieved on 2008-03-06.
- University of Wisconsin - Stevens Point. "Senecio L." (HTML). Robert W. Freckmann Herbarium. Retrieved on 2008-03-06.
- Royal Horticultural Society. "RHS PLANT FINDER" (HTML). Retrieved on 2008-03-06.
- Manual of Gardening (Second Edition) at Project Gutenberg
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