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Erigeron floribundus

From Wikipedia, the free encyclopedia

Erigeron floribundus
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Erigeron
Species:
E. floribundus
Binomial name
Erigeron floribundus
(Kunth) Sch.Bip.[1]
Synonym list
    • Conyza floribunda Kunth
    • Conyza sumatrensis var. floribunda (Kunth) J.B.Marshall
    • Conyza albida Willd. ex Spreng.
    • Conyza bilbaoana J.Rémy
    • Conyza bonariensis var. leiotheca (S.F.Blake) Cuatrec.
    • Conyza elata Kunth & C.D.Bouché
    • Conyza floribunda var. laciniata Cabrera ex G.M.Barroso
    • Conyza floribunda var. linearifolia P.D.Sell
    • Conyza myriocephala J.Rémy
    • Conyza sumatrensis var. leiotheca (S.F.Blake) Pruski & G.Sancho
    • Erigeron albidus (Willd. ex Spreng.) A.Gray
    • Erigeron bilbaoanus (J.Rémy) Cabrera
    • Erigeron bonariensis var. leiothecus S.F.Blake
    • Erigeron myriocephalus (J.Rémy) Herter
    • Marsea bonariensis var. leiotheca (S.F.Blake) V.M.Badillo

Erigeron floribundus is an annual/biennial plant native to South America to Mexico and introduced to many parts of the world. Its common names include tall fleabane, Bilbao's fleabane, and many-flowered fleabane.[citation needed]

Description

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Erigeron floribundus is a tall annual/biennial (to 1.5 m) with a rather hairy stems and a multitude of small flower heads (c. 5 mm tall) displayed in a slightly loose branched inflorescence widening above. The flower heads have slight, but not conspicuous, ray petals that are sometimes purple-tinged with sides that are approximately hairless and 5-6(7) inner phyllaries across. Its leaves have some projecting hairs at the base and forward-pointing hairs at the tip that tend to lean into the leaf margin, the surfaces with only sparse hairs.[2][3][4]

Similar globally-spreading species with unhairy flower heads include E. canadensis, which has short ray petals conspicuous (generally a sufficient feature when in flower), always white (not sometimes purpled), the inflorescence rather cylindrical (rather than widening above), leaf margin bases usually with more long projecting hairs, leaf margin tips with forward hairs (not turning in to leaf), flower head side phyllaries more numerous (8-12, not 5–7).[4][2][3]

Taxonomy

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Older literature such as the 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.[5]

Distribution

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South America to Mexico, and introduced to many parts of the world (W. Europe, CW Africa, Madagascar, Australia, SE Asia).[1]

Photographic description

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  • Photographs from Edinburgh (Scotland)

References

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  1. ^ a b Plants of the World Online (with map)
  2. ^ a b Clive Stace. New Flora of the British Isles, ed. 4, 2019.
  3. ^ a b Peter Sell & Gina Murrell. Flora of Great Britain and Ireland, vol. 4.
  4. ^ a b BSBI News No. 135, Apr 2017, pg 9-19, "Common problems with identification in Conyza: Norfolk experience" by Bob Leaney, providing detailed comparisons and diagrams
  5. ^ Erigeron Floribundus and E. Sumatrensis (Asteraceae) In The USA And Mexico, 2018 by Guy L. Nesom, p16 in section on Erigeron floribundus