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Section 1: The Cast of Characters: Life Cycles
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The
cast of characters includes the major groups of the kingdom Plantae.
This outline groups plants by morphological similarities, not by
their phylogenetic (evolutionary) relationships.
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Non-vascular plants (Bryophytes)
Hepaticopsida
(Marchantia: liverworts)
Bryopsida-mosses
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Vascular Plants (Tracheophytes)
Pteridophytes, non-seed vascular plants, ferns and fern allies
Psilopsids
(Psilotum:, whisk fern)
Lycopsids, lycopods
(Lycopodium, Selaginella: clubmoss)
Sphenopsids, horsetails
(Equisetum: horsetail)
Pteropsids, ferns
(Nephrolepis: ruffles; Cyrtonium: holly fern)
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Seed plants, phanerogams, and spermatophytes
Gymnosperms
Cycads
(Zamia or Cycas: sago palm)
Ginkgo (Ginkgo:
maidenhair tree)
Conifers (Pinus:
pine; Thuja: white cedar)
Gnetales (Ephedra:
Mormon tea)
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Angiosperms
Monocots (lilies, orchids, grasses)
Eudicots (oaks, asters, violets)
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Plant Life Cycle- Alternation of Generations
The life cycle of all plants consists of two parts or phases: a sporophytic generation and a gametophytic generation. The sporophytic and gametophytic generations ordinarily alternate with each other, hence the expression "alternation of generations."
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