Kingdom Plantae

In general, all plants have chlorophyll, cell walls of cellulose, and tissues and organs. Biologists have theorized that plants evolved from algae since both plants and algae have chloroplasts with chlorophyll, cell walls of cellulose, glucose stored as starch, and alternation of generations.

Plants are classified in the following divisions:

• Division Bryophyta- plants are primitive and lack vascular tissue and true roots. Examples include mosses and liverworts.
  
  
• Super Division Tracheophyta- plants are more advanced and contain vascular tissue.
  
  
• Division Pterophyta- plants reproduce by spores and grow from underground stems. Example include ferns and horsetails.
  
  
• Division Coniferophyta- plants produce naked seeds in cones and soft wood. Many are evergreens. Examples include redwoods, pines, cypress, and junipers.
  
  
• Division Anthophyta- plants are the most advanced and produce flowers. Class monocotyldonae plants have seeds that contain one cotyledon, leaves with parallel veins, flower parts in multiples of three, no cambium, and scattered vascular bundles in the stem. Class dicotyledonae plants have seeds that contain two cotyledons, leaves with netted veins, flower parts in multiples of four and five, cambium, and vascular bundles in a cylinder.