Erigeron sumatrensis (syn. Conyza sumatrensis) is an annual herb probably native to South America, but widely naturalised in tropical and subtropical regions, and regarded as an invasive weed in many places.[1][2][3]
Conyza bonariensis var. microcephala (Cabrera) Cabrera
Conyza bonariensis f. subleiotheca Cuatrec.
Conyza erigeroides DC.
Conyza floribunda var. subleiotheca (Cuatrec.) J.B.Marshall
Conyza groegeri V.M.Badillo
Conyza naudinii Bonnet
Conyza sumatrensis (Retz.) E.Walker
Dimorphanthes ambigua C.Presl
Dimorphanthes floribunda Cass.
Erigeron albidus (Willd. ex Spreng.) A.Gray
Erigeron ambiguus Sch.Bip.
Erigeron bonariensis var. microcephalus Cabrera
Erigeron crispus subsp. naudinii (Bonnet) Bonnier
Erigeron musashensis Makino
Erigeron naudinii (Bonnet) Humbert
Eschenbachia ambigua Moris
In the British Isles it is known as Guernsey fleabane.[4] Other common names include fleabane, tall fleabane, broad-leaved fleabane, white horseweed, and Sumatran fleabane.[citation needed]
When fully grown (in summer or autumn), Erigeron sumatrensis reaches one to two metres in height. Flowers are white rather than purple-pink. Its leaves are like dandelion leaves, but longer, thinner and more like primrose leaves in colour and texture. Its seeding heads are like dandelions, but straw coloured and smaller.[5] In certain countries the plant has started to exhibit resistance to herbicides.[6]
Distributionedit
It probably originates from South America, but is now naturalised in North America, Europe,[7] Africa,[8] Asia,[9] and Australasia.[10] It poses a significant threat to wildlife conservation areas and other reserves. In Britain, of the non-native former Conyza species, it is the second most abundant (after Erigeron canadensis) and is typically found in London and the South East of England. It was first recorded in London by Brian Wurzell in 1984,[11] and noted in France at Saint-Sozy (Dordogne) in 2006.[12]
Taxonomic noteedit
Older literature such as Flora of Turkey may quote Conyza albida Willd. ex Spreng. intending what is now E. sumatrensis Retz., and should be taken as such; likewise other literature references may do so; the type has subsequently been revised and Conyza albida Willd. ex Spreng. is now viewed as a synonym for Erigeron floribundus (Kunth) Sch.Bip. [13]
Photographic descriptionedit
Tall and tending to end up leaning over
Side phyllaries hairy and green, without red tips, and lacks prominent white petals, which may have a purple tinge
Head from above, ray petals with purple tinge
Individual flower from within head, 5-petalled
Individual flower from within head, 5-petalled
Base leaves quite broad, lobey and hairy, but green-looking not conspicuously grey
Colony of rosettes
Emerging plant, green-looking
Flowering whilst still small
Stem leaf
Stem leaf base
Stem leaf near tip
Stem leaf underside
Stem leaf underside
Stem
Inflorescence prior to heads expanding with pappus
^Flora of China, 苏门白酒草 su men bai jiu cao Erigeron sumatrensis Retzius
^Pruski, J.F. & G. Sancho. 2006. Conyza sumatrensis var. leiotheca (Compositae: Astereae), a new combination for a common neotropical weed. Novon 16(1): 96–101
erigeron, sumatrensis, conyza, sumatrensis, annual, herb, probably, native, south, america, widely, naturalised, tropical, subtropical, regions, regarded, invasive, weed, many, places, scientific, classificationkingdom, plantaeclade, tracheophytesclade, angios. Erigeron sumatrensis syn Conyza sumatrensis is an annual herb probably native to South America but widely naturalised in tropical and subtropical regions and regarded as an invasive weed in many places 1 2 3 Erigeron sumatrensisScientific classificationKingdom PlantaeClade TracheophytesClade AngiospermsClade EudicotsClade AsteridsOrder AsteralesFamily AsteraceaeGenus ErigeronSpecies E sumatrensisBinomial nameErigeron sumatrensisRetz Synonyms 1 List Aster ambiguus E H L KrauseBaccharis ivifolia BlancoConyza albida Willd ex Spreng Conyza altissima Naudin ex DebeauxConyza ambigua DC Conyza bonariensis var microcephala Cabrera CabreraConyza bonariensis f subleiotheca Cuatrec Conyza erigeroides DC Conyza floribunda var subleiotheca Cuatrec J B MarshallConyza groegeri V M BadilloConyza naudinii BonnetConyza sumatrensis Retz E WalkerDimorphanthes ambigua C PreslDimorphanthes floribunda Cass Erigeron albidus Willd ex Spreng A GrayErigeron ambiguus Sch Bip Erigeron bonariensis var microcephalus CabreraErigeron crispus subsp naudinii Bonnet BonnierErigeron musashensis MakinoErigeron naudinii Bonnet HumbertEschenbachia ambigua MorisIn the British Isles it is known as Guernsey fleabane 4 Other common names include fleabane tall fleabane broad leaved fleabane white horseweed and Sumatran fleabane citation needed Contents 1 Description 2 Distribution 3 Taxonomic note 4 Photographic description 5 References 6 External linksDescription editWhen fully grown in summer or autumn Erigeron sumatrensis reaches one to two metres in height Flowers are white rather than purple pink Its leaves are like dandelion leaves but longer thinner and more like primrose leaves in colour and texture Its seeding heads are like dandelions but straw coloured and smaller 5 In certain countries the plant has started to exhibit resistance to herbicides 6 Distribution editIt probably originates from South America but is now naturalised in North America Europe 7 Africa 8 Asia 9 and Australasia 10 It poses a significant threat to wildlife conservation areas and other reserves In Britain of the non native former Conyza species it is the second most abundant after Erigeron canadensis and is typically found in London and the South East of England It was first recorded in London by Brian Wurzell in 1984 11 and noted in France at Saint Sozy Dordogne in 2006 12 Taxonomic note editOlder literature such as Flora of Turkey may quote Conyza albida Willd ex Spreng intending what is now E sumatrensis Retz and should be taken as such likewise other literature references may do so the type has subsequently been revised and Conyza albida Willd ex Spreng is now viewed as a synonym for Erigeron floribundus Kunth Sch Bip 13 Photographic description edit nbsp Tall and tending to end up leaning over nbsp Side phyllaries hairy and green without red tips and lacks prominent white petals which may have a purple tinge nbsp Head from above ray petals with purple tinge nbsp Individual flower from within head 5 petalled nbsp Individual flower from within head 5 petalled nbsp Base leaves quite broad lobey and hairy but green looking not conspicuously grey nbsp Colony of rosettes nbsp Emerging plant green looking nbsp Flowering whilst still small nbsp Stem leaf nbsp Stem leaf base nbsp Stem leaf near tip nbsp Stem leaf underside nbsp Stem leaf underside nbsp Stem nbsp Inflorescence prior to heads expanding with pappus nbsp Seeding nbsp nbsp nbsp References edit a b Erigeron sumatrensis Retz Plants of the World Online Royal Botanic Gardens Kew Retrieved 23 August 2020 dead link Flora of China 苏门白酒草 su men bai jiu cao Erigeron sumatrensis Retzius Pruski J F amp G Sancho 2006 Conyza sumatrensis var leiotheca Compositae Astereae a new combination for a common neotropical weed Novon 16 1 96 101 BSBI List 2007 xls Botanical Society of Britain and Ireland Archived from the original xls on 2015 06 26 Retrieved 2014 10 17 See pictures at International Environmental Weed Foundation Sumatran Fleabane Weedscience org Fleabane in Holland Flora of Zimbabwe Conyza sumatrensis Sumatran Fleabane in Japan Pacific Island Ecosystems at Risk PIER Conyza sumatrensis Fleabane in London Archived from the original on 2011 06 04 Retrieved 2008 03 01 Mark Galliott June 2006 France The Dordogne PDF Tour Report Naturetrek Wildlife Holidays Archived from the original PDF on 2007 09 29 Retrieved 2011 10 18 Erigeron Floribundus and E Sumatrensis Asteraceae In The USA And Mexico 2018 by Guy L Nesom p16 in section on Erigeron floribundusExternal links edit nbsp Media related to Erigeron sumatrensis at Wikimedia Commons Erigeron sumatrensis occurrence data from GBIF Retrieved from https en wikipedia org w index php title Erigeron sumatrensis amp oldid 1200337837, wikipedia, wiki, book, books, library,