Floral Structure, Development, and Relationships of Paleoherbs: Saruma, Cabomba, Lactoris, and Selected Piperales
The current strong interest in the group of taxa known as “paleoherbs” (Donoghue and Doyle, 1989) results from their aggregation at the base of the angiosperms based on morphological evidence (Donoghue and Doyle, 1989a, Donoghue and Doyle, 1989b) and molecular evidence (Zimmer et al., 1989; Hamby, 1990; Hamby and Zimmer, 1992; Chase et al., 1993). For most authors the paleoherbs included Aristolochiales, Nymphaeales, Piperales, and Liliopsida (monocotyle-dons) among others. Lactoridaceae are included by most authors mentioned but not by Loconte and Stevenson (1991). Although the paleoherbs are considered monophyletic by Doyle and Donoghue 1989a, Doyle and Donoghue 1989b and Loconte and Stevenson (1991), some phylogenetic analyses suggest that the paleoherbs are not a monophyletic group (Zimmer et al., 1989; Hamby, 1990; Hamby and Zimmer, 1992; Taylor and Hickey, 1992), although the component groups are still viewed by these authors as having been derived early in angiosperm evolution.
KeywordsFloral Organ Parsimonious Tree Floral Development Polar View Floral Structure
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