Erigeron

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Annual or perennial rosetted or subshrubby herbs; indumentum of simple eglandular and/or glandular hairs, or plants glabrous. Leaves alternate, usually toothed to some degree. Capitula terminal, pedunculate, solitary or in corymbose or paniculate inflorescences, radiate or discoid; involucral bracts in 2–4 rows, herbaceous. Ray florets female, in 1–2 rows, white to blue or purple, style branches smooth to papillose; disc florets bisexual, corolla 5(–4)-lobed, yellow, anthers obtuse at base, with a short, acute, membranous terminal appendage, style branches with small conical protuberances. Cypselas uniform, flattened, glabrous or pubescent, marginal ribs thickened (at least in Australian species); pappus bristles free, barbellate, in a single series.

Cosmopolitan genus of c. 200 species, most native to North America; c. 12 (7 introduced) in Australia.

Most non-native members of this genus in Victoria were formerly treated as Conyza but molecular studies have shown that it, and several other (non-Australian) genera are nested within Erigeron (e.g. Noyes 2000). Until a satisfactory treatment of the group has been accepted, a broad but monophyletic Erigeron is employed here. The correct placement of the native Erigeron conyzoides remains uncertain but morphological features suggest that it belongs with 'Conyza-like' species and it is here retained within Erigeron. Other Victorian species previously included in Erigeron have been transferred to Pappochroma Raf. (q.v.).

Source: Walsh, N.G. (1999). Erigeron. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 4, Cornaceae to Asteraceae. Inkata Press, Melbourne.
Updated by: Val Stajsic, 2019-04-11
 
References

Noyes, R.D. (2000). Biogeographical and evolutionary insights on Erigeron and allies (Asteraceae) from ITS sequence data., Plant Systematics and Evolution 220: 93–114.

 
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