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Seed Plants II: Angiosperms (Basal angiosperms (ancestors became…
Seed Plants II: Angiosperms
Changing concepts about early angiosperms
changed knowledge of existing and fossil plants.
tend to be large trees with dense wood.
flowers are small and simple.
ranalean flower
magnolia type flower was though to be relictual
generalized
original misidentification of these leaves contributed to the erroneous hypothesis
angiosperms must have originated in the jurassic period
oldest wood that seems to be from an angiosperm comes form the aptian epoch
classification of flowering plants
magnoliophyta is such a large group
most widely used monograph of the entire division was
An integrated system of classification of flowering plants by Dr. Arthur
semi informal collaboration of many systematists
reconstruction of glosspteris
monocots or eudicots
all angiosperms are classified of one or the other
Basal angiosperms
contain the living descendants of several groups that originated while angiosperms were still young.
ancestors became reproductively isolated from the other early flowering plants.
before distinctive angiosperm traits had originated
nymphaeaceae are the water lillies
small soft bodied herbs with vascular bundles scattered like those in monocots
lack in wood
austrobaileyales contains woody trees with bisexual flowers
stamens and carpels being similar to those of amborella
carpels are not fused together into a pistil
pollen grains have only a single germination pore
uniaperturate
monocots
commelinoid monocots
differ from the others in several unusual synapomorphies
widely believed to have arisen from early angiosperms
no vascular cambium
several carpels
free or slightly fused
alismatales
contains many aquatic herbs such as sagittaria
found in swamps and marshes
liliales
large group with many. highly derived families.
monocots -- those with large colorful flowers
Eudicots
basal eudicots
ranunculuses and several others are believed to be clades that
diverged at early stages in eudicot evolution
caryophyllales
rosid clade
very large
very diverse
asterid clade
most derived large clade
sunflower, morning glory
