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Chapter 22: Seed Plants I: Seed Plants without Flowers - Coggle Diagram
Chapter 22: Seed Plants I: Seed Plants without Flowers
Division Progymnospermophyta: Progymnosperms
Progymnosperms
vascular cambium is capable of producing both secondary xylem and secondary phloem
Aneurophytales
Archaeopteridales
Division Coniferophyta: Conifers
are diverse, and all are trees of moderate gigantic size
conifers never have vines, herbs, or annuals, and they never have bulbs or rhizomes
conifer leaves are always simple needles or scales
Division Cycadophyta: Cycads
the trunk is covered with bark and persistent leaf bases that remain on the plant even after the lamina and petiole have abscised
cycads produce seed cones and pollen cones, each on separate plants; cycads are always dioecious
most cycads are short plants less than 1 or 2 m tall, but Macrozamia can reach heights of 18 m.
Division Cycadeoidophyta: Cycadeoids
all extinct; had vegetable features almost identical to those of cycads
individual cycadeiods contained both microsporophylls and megasporophylls
Microsporophylls were located below the cluster of megasporophylls and curved upward
