Parasenecio chenopodiifolius (Compositae–Senecioneae) is a Synotis and conspecific with S. otophylla based on evidence from morphology, cytology and ITS/ETS sequence data

Abstract

Observations on living plants and herbarium specimens have convinced us that Synotis otophylla (Compositae -Senecioneae) from south Xizang (Tibet), China, must be merged with the Himalayan Parasenecio chenopodiifolius . However, is the plant a Synotis or a Parasenecio ? We have examined fl oral micro-morphological and cytological characters of P. chenopodiifolius , and performed molecular phylogenetic analyses based on ITS and ETS sequence data. Th e anther collar of this taxon is balusterform, and the endothecial tissue cell wall thickenings are radial. Th ese conform to the fl oral micro-characters of Synotis but diff er from those of Parasenecio , which has subcylindrical anther collars, and polarized endothecial tissue cell wall thickenings. Chromosome counts indicate the taxon has 2n ϭ 40, a number common in Synotis , whereas Parasenecio has 2n ϭ 60. Our phylogenetic analyses based on ITS/ETS sequences also place P. chenopodiifolius in Synotis . We make the new combination S. chenopodiifolia and synonymize S. otophylla .

Senecio kumaonensis (Asteraceae, Senecioneae) is a Synotis based on evidence from karyology and nuclear ITS/ETS sequence data

“…The cladogram (Fig. 4) supports findings by Pelser et al (2007Pelser et al ( , 2010 and Tang et al (2014) that subtribe Tussilagininae s.l. is split into three clades, one of which is moderately-supported and corresponds to Tussilagininae s.s. (PP = 0.90, BS = 61%) suggested by Pelser et al (2007).…”

“…Abrotanella emarginata (Gaudichaud 1825: 104) Cassini (1825: 27) (subtribe Abrotanellinae) was selected as an outgroup according to Pelser et al (2007Pelser et al ( , 2010 and Tang et al (2014).…”

Morphological and cytological data support the independent specific status of Parasenecio delphiniiphyllus (Asteraceae–Senecioneae) from China

“…4H). It is worth mentioning that the cylindrical or sub-cylindrical anther collars and the polarized anther endothecial cell wall thickenings observed in the two species were expected, as Parasenecio is a member of subtribe Tussilagininae within the tribe Senecioneae and the subtribes Tussilagininae and Senecioninae are usually distinct in these two characters (Nordenstam 1978, Jeffrey and Chen 1984, Nordenstam 2007, Nordenstam et al 2009, Tang et al 2014.…”

Transfer of Senecio karelinioides (Asteraceae−Senecioneae) to Synotis based on evidence from morphology, karyology and ITS/ETS sequence data

“…Karyological and molecular data have proven useful in resolving the controversies of generic affiliation in eastern Asian Senecioneae (Ren and Yuan 2010, Tang et al 2014, Ren et al 2017, Tong et al 2017. Alghouth Synotis and eastern Asian Senecio have the same chromosome number of 2n = 40 (and several annual Senecio species are also reported with 2n = 20 and/or 60), they differ markedly in their karyotype (Liu 1999, Ren andYuan 2010, Tang et al 2013b, c, 2014, Ren et al 2016, Tong et al 2017.…”

“…Based on evidence from macro-and micromorphology, karyology, and molecular phylogeny, Parasenecio chenopodifolius (DC.) Grierson (Tang et al 2014) and Sen. kumaonensis Duthie ex C. Jeffrey & Y. L. Chen (Tong et al 2017) have been shown to be members of Synotis. In this study, we examine the karyotype of Sen. karelinioides and reconstruct its phylogeny using ITS and ETS to further investigate the generic affiliation of the species.…”