Saturday, January 21, 2012

Major Plant Divisions

Charophyceans
Charophyceans are the green algae most clearly related to land plants.  They seem to share many characteristic typical of a land plant.
Bryophytes
Bryophytes include the mosses, liverworts, and hornworts.  They live in moist areas because of their lack of vascular tissue.  They reproduce using spores with reproductive structures of gametangia and sporangia.
Pteridophytes
Are vascular plants, which contain xylem and phloem.  Horsetails, ferns, club mosses, and quillworts are pteridophytes.  Instead of producing flowers or seeds, they produce spores, but do have true roots, stems, and leaves.
 








 Gymosperms
Gymnosperms include trees such as conifers, cycads, and ginkgo.  Theses are a group of seed-bearing plants, the seeds of the gymnosperms are unenclosed and are called ovules in their unfertilized state.

Angiosperms
Angiosperms produce seeds, but also produce flowers which contains their reproductive organs.  The seeds are enclosed during pollination and produce fruit. The fruit then produces more seeds.

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