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Senecio

From Wikipedia, the free encyclopedia
This article is about a genus of flowering plants in the daisy family. For the painting by Paul Klee, see Senecio (Klee).

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[1]

1,482; see text

Synonyms[1]
Synonymy
  • Acleia DC.
  • Adenotrichia Lindl.
  • Anecio Neck.
  • Aspelina Cass.
  • Brachypappus Sch.Bip.
  • Brachyrhynchos Less.
  • Cadiscus E.Mey. ex DC.
  • Carderina Cass.
  • Cladopogon Sch.Bip.
  • Crociseris (Rchb.) Fourr.
  • Cryptochaete Raimondi
  • Erechthites Less.
  • Eudorus Cass.
  • Farobaea Schrank ex Colla
  • Jacobanthus Fourr.
  • Madacarpus Wight
  • Madaractis DC.
  • Melalema Hook.f.
  • Metazanthus Meyen
  • Moerkensteinia Opiz
  • Obaejaca Cass.
  • Pseudojacobaea (Hook.f.) R.Mathur
  • Pterosenecio Sch.Bip. ex Baker
  • Sclerobasis Cass.
  • Seneciunculus Opiz
  • Symphipappus Klatt
  • Synarthrum Cass.

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]

Description

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Morphology

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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

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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

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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

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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]

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.
S. barbertonicus Succulent Bush Senecio

The following genera are currently accepted by Plants of the World Online, and contain species that are or have been included within Senecio.[5]

Etymology

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The scientific name, Senecio, derives from the latin 'senex' which means "old man".

Selected species

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S. haworthii Woolly Senecio
Senecio madagascariensis, Fireweed
Senecio angulatus, Cape Ivy
Main article: List of Senecio species

Formerly in Senecio (partial list)

Distribution

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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

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References

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  1. ^ a b c "Senecio L." Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 18 June 2025.
  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 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. ^ 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.
  11. ^ Sean Claes (2007-04-16). "Proceed With Caution". Kyle, Texas Daily Photo. Retrieved 2008-04-10.
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