Please enable JavaScript.
Coggle requires JavaScript to display documents.
Chapter 22: Seed Plants w/o Flowers (Gymnosperms) (Division Coniferophyta:…
Chapter 22: Seed Plants w/o Flowers (Gymnosperms)
Concepts:
lignophytes
monophyletic group of woody plants
spermatophytes
seed plants
2 classes:
angiosperms
flowering plants
gymnosperms
pine cones
manoxylic wood
large, compound leaves
radially symmetrical seeds
occurs in cycads
pycnoxylic wood
hard, strong wood w/ little parenchyma
bidirectionally symmetrical
Divison Progymnospermophyta: Progymnosperms
extinct
Aneurophytales
relictual progymnosperms
Archaeopteridales
more derived progym
Evolution of Seeds
integument
micropyle
pollen chamber
Division Pteridospermophyta: Seed Ferns
all extinct
Upper Devonian Period
Division Coniferophyta: Conifers
diverse
giant redwoods
pines
two types of shoot:
long shoots
short shoots
never have bulbs or rhizomes
perennial
simple venation
leaves are simple needles or scales
2 cones types:
pollen cones
simple cones
bears microsporophylls
seed cones
more complex
compound cones
shoots w/axillary buds
cone bracts
ovuliferous scale
Division Cycadophyta: Cycads
stout trunks
pinnately compound leaves
short plants
megasporophylls more derived
Division Cycadeoidophyta: Cycadeoids
all extinct
almost identical to cycads
both micro and megasporophylls
Division Ginkgophyta: Maidenhair Tree
one living species
Ginkgo biloba
unusual species
looks like large dicot tree
w/ stout trunk
many branches
wood like conifers
lacks vessels and axial parenchyma
