Synopsis of the genus Rennera Merxm. (Asteraceae, Anthemideae) with the description of a new species from South Africa

Herman, P. P. J.

doi:10.1111/j.1095-8339.1999.tb00512.x

Cited by 2 publications

(3 citation statements)

References 5 publications

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“…Rennera is traditionally distinguished by its peculiar fruits, which are non‐myxogenic and have radially unequal mesocarpic cells (Källersjö, ; Herman, ). The species were incorrectly treated as annuals by Källersjö () and Bremer & Humphries (), and have since been shown to be perennial herbs or shrublets (Herman, ). All four species occur in calcareous pans or river banks where the non‐myxogenic fruit are probably advantageous.…”

Section: Discussionmentioning

confidence: 99%

“…Transverse sections, about 3 μm thick, were cut using a Porter-Blüm ultramicrotome and stained according to the periodic acid-Schiff/toluidine blue (PAS/TB) method of Feder & O'Brien (1968). Additional anatomical information provided in Källersjö (1988) and Herman (1999) was also used. Important morphological and anatomical characters between and within the genera are summarized in Table 1. MOLECULAR DATA Seventy-two samples representing 46 species (comprising c. 72% of the subtribe) were included in this study.…”

Section: Morphological Datamentioning

confidence: 99%

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Phylogenetic relationships and generic realignments in the early diverging subtribe Pentziinae (Asteraceae, Anthemideae)

et al. 2015

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Pentziinae are a subtribe of tribe Anthemideae (Asteraceae), comprising seven almost exclusively southern African endemic genera and c. 60 species. Generic delimitations and relationships in the subtribe are explored using parsimony and Bayesian analyses of nuclear (internal transcribed spacer, ITS) and plastid (ndhF, psbA‐trnH, trnK‐rps16 and rpl32‐trnL) DNA regions, with morphological and fruit anatomical studies. Phylogenetic analyses for 72 accessions (43 species) representing 72% of the subtribe indicate that several of the genera are not monophyletic as currently circumscribed. Pentzia tortuosa differs from its congeners in its inconspicuously three‐ribbed fruits and in several other distinctive morphological characters. In the phylogenetic trees based on the nuclear dataset, P. tortuosa is recovered in the perennial clade with its congeners, but in the plastid data set, it is strongly placed among the early diverging lineages comprising annual taxa with three‐ribbed fruits. Even with the exclusion of P. tortuosa, Pentzia remains paraphyletic by the inclusion of at least Rennera and possibly also Cymbopappus and Marasmodes. A possible sister relationship between Marasmodes and Pentzia, however, cannot be excluded. The four Rennera specise are therefore here transferred to Pentzia, whereas Marasmodes and Cymbopappus are retained pending further investigation. Among the annual lineages, Foveolina is also found to be polyphyletic, with F. dichotoma (the type species) and F. tenella clearly allied with Oncosiphon, and the anomolous species, F. burchellii, recovered with Myxopappus in the nuclear trees. Both Myxopappus species share the disciform capitula and heteromorphic fruits with Foveolina burchellii (characters previously overlooked in Myxopappus and reported here for the first time). © 2015 The Linnean Society of London, Botanical Journal of the Linnean Society, 2015, 178, 633–647.

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Section: Discussionmentioning

confidence: 99%

Section: Morphological Datamentioning

confidence: 99%

Phylogenetic relationships and generic realignments in the early diverging subtribe Pentziinae (Asteraceae, Anthemideae)

et al. 2015

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“…Morphological features that are taxonomically important at the tribal level in Asteraceae include many floral characters but they also include characteristics such as pappus form, and anatomical and morphological features of the achenes (Spjut, 1994). Studies of the Asteraceae fruits were performed by Pandey and Singh (1980), Pandey et al (1983), Bruhl and Quinn (1990), Puttock (1994), Martins and Oliveira (2007), Herman (2008), Zarembo and Boyko (2008), Julio and Oliveira (2009), Galastri and Oliveira (2010), Marzinek and Oliveira (2010).…”

Section: Introductionmentioning

confidence: 99%

Pappus and cypsela ontogeny in Asteraceae: structural considerations of the tribal category

Frangiote-Pallone

Souza

2014

Revista Mexicana de Biodiversidad

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Crepis japonica (L.) Benth., Porophyllum ruderale (Jacq.) Cass. and Tridax procumbens L. are weedy species that grow in cultivated fields, roadsides, abandoned fields and open, disturbed spaces in Maringa, Parana state, Brazil. The ontogeny of the fruits and seeds of the 3 Asteraceae species was carried out. The flowers and developing fruits were prepared according to resin inclusion techniques for histochemical tests and scanning electron microscopy. During maturation of the pericarp, processes such as trichome differentiation, tissue sclerification, phytomelanin deposition and breakdown of tissues can be observed. The fruit of C. japonica is entirely lacking in phytomelanin. The seed is only exotestal in C. japonica. Comparative analysis of the pappus and cypsela characters demonstrated that they are efficient in separating species and tribes. The seed coat and embryo may also be useful in the characterization of tribes.

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Synopsis of the genus Rennera Merxm. (Asteraceae, Anthemideae) with the description of a new species from South Africa

Cited by 2 publications

References 5 publications

Phylogenetic relationships and generic realignments in the early diverging subtribe Pentziinae (Asteraceae, Anthemideae)

Phylogenetic relationships and generic realignments in the early diverging subtribe Pentziinae (Asteraceae, Anthemideae)

Pappus and cypsela ontogeny in Asteraceae: structural considerations of the tribal category

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