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The Amborella trichopoda, Ericales, Rosids, Lamiids (euAsterids), and Campanulids (euAsterids) sequences are colored in dark blue, blue, burgundy, green, and red, respectively.
For each random resolution we calculated the pairwise differences between number of colonizations of rosids, asterids, and other seed plants from the ancestral clade Rosid 1B.
Orchidaceae, Arecales, rosids in general with Malpighiales in particular are 'hot' taxa for future morphological studies.
Rosids. The distribution of floral monosymmetry is uneven.
Asymmetry based on modification of elaborate monosymmetry is present in some monocots (among Asparagales, Commelinales, and Zingiberales), some rosids (among Myrtales, and Fabales), and some asterids (among Lamiales, Asterales, and Dipsacales), and asymmetry by different anther height in otherwise polysymmetric, tubular flowers appears restricted to asterids (some Ericales, Gentianales, and Solanales).
Circumscription of Myrtales and their relationships to other rosids: Evidence from rbcL sequence data.
This is probably the reason why most such taxa that have turned out to be asterids in molecular studies, were formerly classified in rosids or dilleniids.
Moreover, the primitive status of aluminum hyperaccumulation is generally supported by molecular phylogenies since aluminum hyperaccumulation is common at the base of major clades such as basal angiosperms (Laurales), rosids (especially Malpighiales, Oxalidales, and Myrtales), the asterids (Cornales, Ericales), euasterids I (Gentianales), and euasterids II (Aquifoliales), but the feature clearly has been lost independently in numerous more-derived branches.
Therefore, staminodes will have different positions and functions in acyclic magnoliids, polysymmetric rosids, or zygomorphic asterids.
Analysis of rbcL data in a broad range of angiosperm taxa (Chase et al., 1993) provided support for division of the eudicots (dicotyledons with triaperturate pollen) into two major groups: (1) tenuinucellate/sympetalous (asterids) and (2) not tenuinucellate/polypetalous (rosids).
First steps towards a floral structural characterization of the major rosid subclades.