Senecioneae

Taxobox

---

image_caption = "Lopholaena coriifolia"
regnum = Plantae
divisio = Magnoliophyta
classis = Magnoliopsida
ordo = Asterales
familia = Asteraceae
tribus = Senecioneae
tribus_authority = Cass.
subdivision_ranks = Genera
subdivision = See text Senecioneae is the largest tribe of the Asteraceae, or the sunflower family, comprising approximately 150 genera and 3,000 species. Almost one-third of the species in this tribe are placed in the genus "Senecio".cite journal
last =Pelser
first =Pieter B
coauthors = Nordenstam, Bertil; Kadereit, Joachim W.; Watson, Linda E.
title = An ITS phylogeny of tribe Senecioneae (Asteraceae) and a new delimitation of "Senecio" L.
journal = Taxon
volume =56
issue =4
pages =pp. 1077–14E(-1062)
publisher = International Association for Plant Taxonomy (IAPT)
date =November 2007
accessdate = 2008-04-14 ] Its members exhibit probably the widest possible range of form to be found anywhere in the entire plant kingdom and include annuals, minute creeping alpines, perennial herbs, shrubs, climbers, succulents, trees and semi-aquatic plants.cite web
url = http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=20544
accessdate = 2008-04-14
author = Flora of North America
authorlink = Flora of North America
format = HTML
volume = 20
work = Family List
pages = 540
title = Senecioneae] .

Plants in this tribe are responsible for more livestock poisonings than all other plants combined.cite journal | url = http://www.amjbot.org/cgi/content/full/89/6/929 | journal = American Journal of Botany | year = 2002 | volume = 89 | pages = 929–939 | title = Tackling speciose genera: species composition and phylogenetic position of Senecio sect. Jacobaea (Asteraceae) based onplastid and nrDNA sequences | author = Pieter B. Pelser, Barbara Gravendeel and Ruud van der Meijden | doi = 10.3732/ajb.89.6.929 ] The poisons are particularly pyrrolizidine alkaloids in "Senecio" and furanoeremophilanes in "Tetradymia"cite web | url = http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=20544 | work = Flora of North America | title = Senecioneae] .

A number of species are well-known in horticulture.

Classification

Since the time days of Bentham, the "premier systematic botanist of the nineteenth century"cite journal
last = Barkley
first = T. M.
authorlink =
coauthors =
title = Generic Boundaries in the Senecioneae
journal = Taxon
volume = 34
issue = 1
pages = 17–21
publisher = International Association for Plant Taxonomy (IAPT)
location =
date = February 1985
url = http://www.jstor.org/pss/1221558
doi =
id =
accessdate = 2008-04-14 ] considerable efforts have been made to classify and understand the striking morphological diversity in Senecioneae.The traditional view of the tribe has been that of one huge genus "Senecio" plus many other genera which exhibit varying degrees of distinctiveness. Circumscription and delimitation of the tribe has experienced expansions and contractions over the decades as genera and groups of genera have been moved in and out,as was the case for "Arnica", "Liabum", "Munnozia", "Schistocarpha", etc. which have since then been excluded.Of the several potential causes for this constant redefinition the greatest is probably that little is known about its intergeneric relationships or a lack of phylogenetic understanding enhanced by the other problems of conflicting clues from morphological characters, the large size of the tribe, the absence of a precise delimitation or circumscription of "Senecio" and the naturalness of these assemblages combined with the imprecise boundaries of the different species themselves.

Many segregate genera have been recognized in recent studies, often with circumscriptions derived from selected representative species. It is yet unclear that the recognition of numerous segregate genera provides a better taxonomy than treating the variation patterns as infrageneric taxa. A respectable case can be made for maintaining "Senecio" as a broad concept, at least until revisionary studies at the species level are carried out and the results subjected to critical analyses.Most genera that have been removed from Senecioneae in its broadest sense have come to rest within Liabeae or within a broadly circumscribed Heliantheae (e.g., allies in Arnicinae, Chaenactidinae, or Madiinae; "Haploësthes" in Flaveriinae; "Raillardella" and allies in Madiinae). Additional information may be found in B. G. Baldwin et al. (2002), H. Robinson (1981), B. Nordenstam (1977-1978) and K. Bremer (1994).

Genera

Selection of genera compiled from several lists:cite web
url = http://ww2.bgbm.org/EuroPlusMed/PTaxonDetail.asp?NameId=131779&PTRefFk=7000000
title = Details for: "Senecioneae"
accessdate = 2008-04-14
author = Botanic Garden and Botanical Museum Berlin-Dahlem
authorlink = Botanical Garden in Berlin
format = HTML
work = Euro+Med PlantBase
publisher = Freie Universität Berlin ]

References

External links