| Erigeron sumatrensis |
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| Scientific classification |
| Kingdom: |
Plantae |
| Clade: |
Tracheophytes |
| Clade: |
Angiosperms |
| Clade: |
Eudicots |
| Clade: |
Asterids |
| Order: |
Asterales |
| Family: |
Asteraceae |
| Genus: |
Erigeron |
| Species: |
E. sumatrensis |
| Binomial name |
Erigeron sumatrensis
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| Synonyms |
- 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
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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.
In the British Isles it is known as Guernsey fleabane. Other common names include fleabane, tall fleabane, broad-leaved fleabane, white horseweed, and Sumatran fleabane.