Senecio

Summary

Senecio /sɪˈnʃi./[2] is a genus of flowering plants in the daisy family (Asteraceae) that includes ragworts and groundsels.

Senecio
Senecio vulgaris, an illustration from 1885
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Subfamily: Asteroideae
Tribe: Senecioneae
Genus: Senecio
L.
Type species
Senecio vulgaris
Species

Some 1,250; see text

Synonyms[1]

Dendrosenecio
Jacobaea L.
Vendredia Baill.
Culcitium Humb. & Bonpl

Variously circumscribed taxonomically, the genus Senecio is one of the largest genera of flowering plants.

Description edit

Morphology edit

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. The only species which are trees are the species formerly belonging to Robinsonia occurring on the Juan Fernández Islands.[3]

Chemistry edit

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.

Taxonomy edit

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 edit

Many genera and the whole tribe are 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]

Genera that have been included are the following:[5]

Synonyms edit

 
Some of the popular succulent species that were included within Senecio, such as Senecio serpens (pictured) and Senecio rowleyanus, are now placed in the Curio genus.

The following genera contain species that are or have been included within Senecio.[5]

Etymology edit

The scientific name, Senecio, means "old man".

Selected species edit

 
S. barbertonicus Succulent Bush Senecio
 
S. haworthii Woolly Senecio
 
Senecio madagascariensis, Fireweed
 
Senecio angulatus, Cape Ivy
 
Senecio macroglossus (wax ivy)
 
Senecio elegans (redpurple ragwort)

Formerly in Senecio

Distribution edit

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 edit

References edit

  1. ^ a b c Germplasm Resources Information Network (GRIN) (2007-05-04). "Genus: Senecio L." Taxonomy for Plants. USDA, ARS, National Genetic Resources Program, National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved 2008-02-27.
  2. ^ Sunset Western Garden Book, 1995:606–607
  3. ^ Pelser, Pieter B.; Tepe, Eric J.; Kennedy, Aaron H.; Watson, Linda E. (2013-06-10). "The fate of Robinsonia (Asteraceae): sunk in Senecio , but still monophyletic?". Phytotaxa. 5 (1): 31–46. doi:10.11646/phytotaxa.5.1.2. ISSN 1179-3163.
  4. ^ Taylor, Ronald J. (1994) [1992]. Sagebrush Country: A Wildflower Sanctuary (rev. ed.). Missoula, MT: Mountain Press Pub. Co. p. 156. ISBN 0-87842-280-3. OCLC 25708726.
  5. ^ a b c d e f Pelser, Pieter B.; Nordenstam, Bertil; Kadereit, Joachim W.; Watson, Linda E. (2007). "An ITS Phylogeny of Tribe Senecioneae (Asteraceae) and a New Delimitation of Senecio L". Taxon. 56 (4): 1077. doi:10.2307/25065905. JSTOR 25065905.
  6. ^ Passalacqua, Nicodemo G.; Peruzzi, Lorenzo; Pellegrino, Giuseppe (August 2008). "A Biosystematic Study of the Jacobaea maritima Group (Asteraceae, Senecioneae) in the Central Mediterranean Area". Taxon. 57 (3): 893–906. doi:10.1002/tax.573018. JSTOR 27756716.
  7. ^ Frodin, David G. (2004). "History and concepts of big plant genera". Taxon. 53 (3): 753–76. doi:10.2307/4135449. JSTOR 4135449.
  8. ^ Pelser, Pieter B.; Kennedy, Aaron H.; Tepe, Eric J.; Shidler, Jacob B.; Nordenstam, Bertil; Kadereit, Joachim W.; Watson, Linda E. (2010-05-01). "Patterns and causes of incongruence between plastid and nuclear Senecioneae (Asteraceae) phylogenies". American Journal of Botany. 97 (5): 856–873. doi:10.3732/ajb.0900287. ISSN 0002-9122. PMID 21622451.
  9. ^ Norton, D.A. (1986). "Recent changes in the names of New Zealand tree and shrub species" (PDF). New Zealand Journal of Forestry. 31: 39–40. Archived from the original (PDF) on 2010-08-16. Retrieved 2008-04-10.
  10. ^ Sean Claes (2007-04-16). "Proceed With Caution". Kyle, Texas Daily Photo. Retrieved 2008-04-10.

External links edit

  • "Senecio Succulents". Planet Desert. Retrieved 2022-02-18.
  • Germplasm Resources Information Network (GRIN) (2005-10-26). "Genus: Senecio L." Taxonomy for Plants. USDA, ARS, National Genetic Resources Program, National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved 2008-03-06.
  • Integrated Taxonomic Information System Organization (ITIS) (20 December 2007). "Senecio L." Integrated Taxonomic Information System on-line database. Retrieved 2008-02-23.
  • Botanic Garden & Botanical Museum Berlin-Dahlem. "Details for: Senecio". Euro+Med PlantBase. Freie Universität Berlin. Retrieved 2008-03-06.
  • Missouri Botanical Garden (1753). "Seneco L." Tropicos Nomenclatural Data Base. Archived from the original on 2003-07-24. Retrieved 2008-03-27.
  • Flora of Israel Online. "Search Results For 'senecio'". Hebrew University of Jerusalem. Retrieved 2008-03-06.
  • Jerusalem Botanical Gardens. "LIST OF ALL PLANTS NAMES -WITH PHOTO S". Archived from the original on 2007-10-04. Retrieved 2008-03-06.
  • Flora of North America. "Family List: 215. Senecio Linnaeus". 20: 540, 541, 542, 543, 544, 545, 570, 615. Retrieved 2008-03-06. {{cite journal}}: Cite journal requires |journal= (help)
  • Cyrille Chatelain; Laurent Gautier; Raoul Palese. "Senecio L." African Flowering Plants Database. Conservatoire et Jardin botaniques de la Ville de Genève. Retrieved 2008-03-06.
  • Instituto Darwinion. "Asteraceae". Catálogo de las Plantas Vasculares de la República Argentina. II (in Spanish). Universidad de Buenos Aires. p. 255. Archived from the original (PDF) on August 21, 2007. Retrieved 2008-03-06.
  • Helen Coleman, FloraBase: Flora of Western Australia (1997-06-18). "search term: Senecio". Flora Descriptions. Government of Western Australia. Archived from the original on 2010-08-08. Retrieved 2008-03-06.
  • Landcare Research. "Senecio L." Flora of New Zealand: Taxa. Landcare Research Allan Herbarium and New Zealand Plant Names Database. Retrieved 2008-04-01.
  • "Search for:genus:Senecio". Species Information. Calflora — 1700 Shattuck Ave. #198, Berkeley, CA 94709. Retrieved 2008-02-09.
  • Flora of Chile. "Volume 4 Asteraceae Senecio L". 4. Retrieved 2008-03-06. {{cite journal}}: Cite journal requires |journal= (help)
  • Richard Wunderlin or Bruce Hansen (2006). "Search Results For Search String: Senecio". Atlas of Florida Vascular Plants. Institute for Systematic Botany. Retrieved 2008-03-06.
  • PlantNET — The Plant Information Network System of Botanic Gardens Trust. "Search terms: Senecio". Botanic Gardens Trust. Retrieved 2008-03-06.
  • University of Wisconsin–Stevens Point. "Senecio L." Robert W. Freckmann Herbarium. Retrieved 2008-03-06.
  • Manual of Gardening (Second Edition) at Project Gutenberg