Biography:

In the past ILSE BREITWIESER has collaborated on articles with Sven Himmelreich and Bernadette Grosse-Veldmann. One of their most recent publications is Regular ArticleLeaf anatomy ofRaouliaHook.f. (Compositae, Gnaphalieae)☆. Which was published in journal Botanical Journal of the Linnean Society.

More information about ILSE BREITWIESER research including statistics on their citations can be found on their Copernicus Academic profile page.

ILSE BREITWIESER's Articles: (3)

Regular ArticleLeaf anatomy ofRaouliaHook.f. (Compositae, Gnaphalieae)☆

AbstractLeaf anatomy is compared for all species ofRaoulia.The species are tabulated according to their lamina structure. Noteworthy anatomical features are lamina type and grade of differentiation, stomatal position, epidermal and cuticle thickness, shape of mesophyll cells, presence or absence of central clear cells, sclerenchyma caps, abaxial collenchyma and protruding midrib. It is shown that leaf anatomy data provide characters which are taxonomically useful inRaoulia.The main subgenera are supported except that the leaf anatomy ofR. haastiiis anomalous and that ofR. youngiiis typical ofR.subg.Raouliarather thanR.subg.Psychrophyton.The leaf anatomy ofR. petriensisis unique in the genus.

Phylogeny, biogeography, and evolution of sex expression in the southern hemisphere genus Leptinella (Compositae, Anthemideae)

AbstractLeptinella is exceptional in the Anthemideae (Compositae) in its evolution of dimorphic sex expression. A molecular phylogeny including 40 of its 42 described taxa based on nucleotide sequences from two plastid regions (psbA–trnH and trnC–petN spacers) and one nuclear marker (nrDNA ITS) is presented.Phylogenetic reconstruction was hampered by inadequate phylogenetic signal indicating recent radiation of species during the last 5 Ma and high level of reticulate evolution presumably caused by hybridisation and polyploidisation. Nevertheless, Leptinella is nested within a paraphyletic genus Cotula that also engulfs the South American genus Soliva. Within Leptinella, the highly polyploid and sexually polymorphic subgenus Leptinella is monophyletic, while subgenus Oligoleima as well as subgenus Radiata are polyphyletic.We found a basal split between a lineage of Australian and New Guinean taxa and one of largely New Zealand taxa. At least five long-distance dispersal events have to be assumed in order to explain the distribution pattern in Leptinella. Among those, one is from New Zealand to Australia, while the others are dispersals to South America and to several subantarctic islands.The phylogeny presented here indicates that the ancestral sex expression in Leptinella is monoecy and that dioecy and paradioecy are derived conditions. High ploidy is especially common in the dioica-group, where dioecy is also common. However, the occurrence of a dioecious sex expression in tetraploid representatives of this group and of polyploidy in other clades that only exhibit monoecious or paradioecious conditions indicate that there is no consistent correlation between these two characters.

Pulling the sting out of nettle systematics – A comprehensive phylogeny of the genus Urtica L. (Urticaceae)

Highlights•A comprehensive phylogeny for Urtica is provided including 61 of 63 species recognized.•E Asian Zhengyia is sister to Urtica; W Eurasian U. pilulifera and U. neubaueri are sister to all other Urtica.•Both morphology and geographical range are poor predictors of relatedness in Urtica.•Widespread occurrence of island endemics indicates high dispersability of Urtica.

Advertisement
Join Copernicus Academic and get access to over 12 million papers authored by 7+ million academics.
Join for free!

Contact us