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30. Plant Diversity II: The Evolution of Seed Plants

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integuments
Layers of sporophyte tissue that envelop and protect the megasporangium
progymnosperms
Transitional species of gymnosperms
filament
Stalk of the stamen, connected to the anther
style
Stalk of the carpel, connected to the stigma
receptacle
Part where the flower is attached to the stem
pistil
A single or group of carpel(s)
pericarp
The thickened wall of fruit, stemming from the wall of the ovary