Biogeographical and evolutionary insights onErigeron and allies (Asteraceae) from ITS sequence data

Glyphosate-resistant hairy fleabane documented in the Central Valley

“…This weed belongs to the Asteraceae family and is an annual or short-lived perennial native to South America (Noyes 2000). At the seedling stage, hairy fleabane (Conyza bonariensis) looks very similar to horseweed (Conyza canadensis) and can often be found growing in the same locations.…”

Speciation and Biogeography of <I>Erigeron</I> (Asteraceae) in the Juan Fernández Archipelago, Chile, based on AFLPs and SSRs

“…This species is not known from the islands, and the voucher specimen reveals this collection number to be the endemic E. rupicola from Alejandro Selkirk Island. These two island endemics are monophyletic with ITS data (Noyes 2000), but a comprehensive analysis including all island species has not yet been accomplished. Because of morphological cohesiveness, however (Valdebenito et al 1992), it is likely that the group in the islands has resulted from a single introduction.…”

“…Morphological phenetic analyses among 22 species of Erigeron in South America (Valdebenito et al 1992) have revealed all island taxa to form a cluster, but which also includes E. leptorhizon from coastal Peru. Noyes (2000) carried out a molecular phylogenetic study that included many species of Erigeron using sequences from the internal transcribed spacer of nuclear ribosomal DNA (ITS), but sampling in the islands was restricted to only E. fernandezianus and E. rupicola. It should be pointed out that the collection of the latter taxon, Stuessy et al 8508, was mistakenly listed in the ITS study (Noyes 2000) as E. rosulatus.…”

“…Noyes (2000) carried out a molecular phylogenetic study that included many species of Erigeron using sequences from the internal transcribed spacer of nuclear ribosomal DNA (ITS), but sampling in the islands was restricted to only E. fernandezianus and E. rupicola. It should be pointed out that the collection of the latter taxon, Stuessy et al 8508, was mistakenly listed in the ITS study (Noyes 2000) as E. rosulatus. This species is not known from the islands, and the voucher specimen reveals this collection number to be the endemic E. rupicola from Alejandro Selkirk Island.…”

Clonal structure and reduced diversity of the invasive alien plant Erigeron annuus in Lithuania

“…Reduced genetic variability is typically found in such populations of invasive species, due to marked founder effects and reproductive systems limiting the diversity of genotype [7]. The lower genetic diversity of some invasive plant populations has been shown with molecular markers such as ITS [8], RAPD [9][10][11] and ISSR [11][12][13][14]. In contrast, rather high genetic diversity has been shown in populations of the apomictic invaders Taraxacum, as revealed with AFLP markers [15], and Erigeron annuus, as revealed using RAPD and AFLP [16,17] markers.…”