Senecio inaequidens

Senecio inaequidens, known as narrow-leaved ragwort[4] and South African ragwort,[5] is a species of flowering plant in the daisy family Asteraceae.

Senecio inaequidens
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Senecio
Species:
S. inaequidens
Binomial name
Senecio inaequidens
DC. (1838 )
Synonyms

Senecio madagascarensis, Senecio harveianus
Sources: CABI,[1] IPNI,[2] AFPD[3]

Description

Senecio inaequidens is a perennial chamaephyte up to 1 m in height, often much ramified, with each stem ending in one or a few capitula yellow in colour, forming a loose floral display. A single plant produces 26 to 500 capitula each year, with approximately 90 florets, 74% of them developing a viable achene.[6] The leaves are linear, entire or almost so and without petioles.

S. inaequidens exists as a diploid genotype and a tetraploid cytotype. Initially the diploid S. madagascarensis and S. harveianus were assumed to be different species; however molecular analysis showed that they only differ in cytotype.[7]

Distribution

It is native to Southern Africa, including Lesotho, South Africa, Eswatini, Namibia, Mozambique and Botswana.[8]

Habitat

In its native habitat S.inaequidens occurs at elevations from sea level to 2850 m in a wide range of naturally or anthropogenically disturbed habitats such as river banks, rocky slopes, heavily grazed or recently burned grasslands, and road verges.[9] The tetraploid cytotype was only found in the uKhalhamba and Maloti mountain ranges, and this is the cytotype of S.inaequidens which was inadvertently exported to Europe.

S. inaequidens is mostly found along railways and motorways

Invasive spread

The plant is a widespread neophyte in Europe and an invasive species in Central Europe.[10] It was introduced through wool imports from Southern Africa. In Europe the ports of entry were Bremen, Calais, Mazamet, and Verviers.[11]

S. inaequidens commonly exists in ruderal habitats such as railroads, roads and motorways, vacant or disused land[12][13] Plants can be seen on disused land as pioneer species but so far often disappear in an ecological succession. In Central Europe where it first spread, the plant so far seems to use previously unused ecological niches. There does not seem a clear advantage over native vegetation, except in higher altitude. In the European Alps ecologists and farmers are worried that it has the advantage of invading grazing fields on the alm pastures.[14] The furthest north it was found was Norway[15]

S. inaequidens is also present in Korea and Taiwan.[16]

In South America and Australia the diploid variant S. madagascariensis is highly invasive.[17]

Properties

Senecio inaequidens contains pyrrolizidine alkaloids having hepatotoxic properties that are poisonous to mammals.[18]

References
  1. "Senecio Inaequidens". CAB International. 24 September 2019. Retrieved 24 September 2019.
  2. "Senecio inaequidens". International Plant Names Index (IPNI). Royal Botanic Gardens, Kew. Retrieved 2008-05-25.
  3. "Senecio inaequidens DC. record n° 98173". African Plants Database. South African National Biodiversity Institute, the Conservatoire et Jardin botaniques de la Ville de Genève and Tela Botanica. Retrieved 2008-05-25.
  4. "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
  5. "Senecio inaequidens". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 9 November 2015.
  6. Vanparys, Valérie; Cawoy, Valérie; Mahaux, Olivia; Jacquemart, Anne-Laure (25 March 2011). "Comparative study of the reproductive ecology of two co-occurring related plant species: the invasive Senecio inaequidens and the native Jacobaea vulgaris". Plant Ecology and Evolution. 144 (1): 3–11. doi:10.5091/plecevo.2011.434.
  7. Scott, L. J.; Congdon, B. C.; Playford, J. (1998). "Molecular evidence that fireweed (Senecio madagascariensis, Asteraceae) is of South African origin". Plant Systematics and Evolution. 213 (3–4): 251–257. doi:10.1007/BF00985204. S2CID 39040180.
  8. "Senecio inaequidens". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 2020-04-23.
  9. Lachmuth, Susanne; Durka, Walter; Schurr, Frank M. (October 2011). "Differentiation of reproductive and competitive ability in the invaded range of Senecio inaequidens: the role of genetic Allee effects, adaptive and nonadaptive evolution". New Phytologist. 192 (2): 529–541. doi:10.1111/j.1469-8137.2011.03808.x. PMID 21736567.
  10. "Senecio inaequidens (South African ragwort)". www.cabi.org. Retrieved 24 September 2019.
  11. LACHMUTH, SUSANNE; DURKA, WALTER; SCHURR, FRANK M. (September 2010). "The making of a rapid plant invader: genetic diversity and differentiation in the native and invaded range of Senecio inaequidens". Molecular Ecology. 19 (18): 3952–3967. doi:10.1111/j.1365-294X.2010.04797.x. PMID 20854275. S2CID 205363121.
  12. Lachmuth, Susanne; Durka, Walter; Schurr, Frank M. (October 2011). "Differentiation of reproductive and competitive ability in the invaded range of Senecio inaequidens: the role of genetic Allee effects, adaptive and nonadaptive evolution". New Phytologist. 192 (2): 529–541. doi:10.1111/j.1469-8137.2011.03808.x. PMID 21736567.
  13. Pietr Kocián (2016). "The first records of Senecio inaequidens along motorways in Poland and Slovakia". Acta Musei Silesiae, Scientiae Naturales. 65 (2): 129–133. doi:10.1515/cszma-2016-0016.
  14. Vacchiano, G.; Barni, E.; Lonati, M.; Masante, D.; Curtaz, A.; Tutino, S.; Siniscalco, C. (27 November 2013). "Monitoring and modeling the invasion of the fast spreading alien S.inaequidens DC. in an alpine region". Plant Biosystems. 147 (4): 1139–1147. doi:10.1080/11263504.2013.861535. hdl:2434/564238. S2CID 55444936.
  15. "Boersvineblom funnet på Sjursøya i Oslo" (in Norwegian). County Governor's Office in Oslo and Akershus. 19 October 2010. Retrieved 22 October 2010.
  16. Jang, Jin; Park, Su Hyun; Jung, Su Young; Chang, Kae Sun; Yang, Jong Cheol; Oh, Seung Hwan; Han, Yang Soon; Yun, Seok Min (2013). "Two Newly Naturalized Plants in Korea: Senecio inaequidens DC. and S. scandens Buch.-Ham. ex D.Don". Journal of Asia-Pacific Biodiversity. 6 (4): 449–453. doi:10.7229/jkn.2013.6.4.00449.
  17. LÓPEZ, MARIANA G.; WULFF, ARTURO F.; POGGIO, LIDIA; XIFREDA, CECILIA C. (December 2008). "South African fireweed (Asteraceae) in Argentina: relevance of chromosome studies to its systematics". Botanical Journal of the Linnean Society. 158 (4): 613–620. doi:10.1111/j.1095-8339.2008.00865.x.
  18. Dimande, A.F.P.; Botha, C.J.; Prozesky, L.; Bekker, L.; Rosemann, G.M.; Labuschagne, L.; Retief, E. (2007). "The toxicity of Senecio inaequidens DC". Journal of the South African Veterinary Association. 78 (3): 121–9. doi:10.4102/jsava.v78i3.302. PMID 18237033.
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