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Seed Plants II - Angiosperms - Coggle Diagram
Seed Plants II - Angiosperms
Classification of flowering plants
Two distinct lines of evolution
Eudicots
Vascular bundles one ring in stem
Two Cotyledons
woody
herbaceous
succulent
Flower parts arranged in sets of 5 or 4
rarely in sets of 3
Monocots
not restricted to one ring
Only 1 cotyledon on each embryo
leaves usually parallel veined
Never have ordinary secondary growth
Flower parts arranged in multiples of 3
Three sepals
Three petals
Three Stamens
Three Carpels
Contain greatest number of living species
257,000
Magnoliophyta
Angiospermopyta
Single division
Grow shut
primordia crowd
sometimes visible structure
sometimes no sign of seam
develops into fruit
double fertilization
universal in flowering plants
basal angiosperms
primitively vesselless
having wood w/out vessels
lacked vessels b/c ancestors lacked them
secondary vesselless
had vessles
groups then lost them
other derived features
pistil
fusion of carpels
sympetally
fusion of petals
zygomorphy
bilaterally symmetrical
Changing concepts about early angiosperms
becomes more complete
wind pollinated trees
grouped together
subclass hamamelidae
alders
plane trees
elms
oaks
a relic
living in flowering plants
ranalean flower
c.e. bessey hypothesized
magnolia type flower was relictual
flower generalized
sepals
petals
arranged spirally
carpels
100 years ago
Basal Angiosperms
early angiosperms
diverged into several clads
ancestors became reproductively isolated
extant decedants
amborellaceae
nympaeceae
eater lillies
vascular bundles like monocots
lack any wood
small soft bodied herbs
uniaperaturate
basal angiosperms
monocots
