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Chapter 23: Seed Plants II: Angiosperms (Changing Concepts About…
Chapter 23: Seed Plants II: Angiosperms
Changing Concepts About Angiosperms
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Other derived features are the fusion of the carpels into a single structure (a pistil), fusion of petals into one structure (sympetaly), and floral zygomorphy
Were considered the most relictual living flowering plants
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Concepts about the nature of early angiosperms have changed as our knowledge of existing and fossil plants has become more complete
Classification of Flowering Plants
Basal Angiosperms
The early angiosperms diverged into several clades
Nymphaeales (water lilies) have many features of monocots, but classifying them as monocots would create a polyphyletic groups
Monocots and Eudicots
Eudicots are much more diverse and include a greater number of families, genera, and species
Magnoliphyta is such a large group with so many families, genera, and species
Basal Angiosperms
Uniaperturate
Another important feature is that their pollen grains have only a single germination pore
Ancestors of the magnolid clade diverged from early angiosperms a bit later than Amborella and Austrobaileyales
Nymphaeaceae
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Are water lillies
Other magnolids are laurels and avocado (Laurales) and peppers and peperomias (Piperales)
Contains the living descendants of several groups that originated while angiosperms were still a young clade
