Summary:
- Plants are classified into two groups: nonvascular plants and vascular plants.
- Vascular plants are further divided into those that reproduce without seeds and those that reproduce with seeds.
- Seed plants are divided into those that produce seeds in cones and those that produce seeds in the ovaries of flowers.
- Seed plants are called gymnosperms.
- Seed plants called angiosperms produce seeds in the ovaries of flowers.