Erigeron sumatrensis

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] 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.

Erigeron sumatrensis
Fruiting
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Erigeron
Species:
E. sumatrensis
Binomial name
Erigeron sumatrensis
Synonyms[1]
List
    • Aster ambiguus E.H.L.Krause
    • Baccharis ivifolia Blanco
    • Conyza albida Willd. ex Spreng.
    • Conyza altissima Naudin ex Debeaux
    • Conyza ambigua DC.
    • 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

Description

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]

Distribution

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]

References

Media related to Erigeron sumatrensis at Wikimedia Commons

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