Phytologist (a person or biologist who study plants) have sorted and classified plants by similarities and their difference. This is called TAXONOMY. Phytologist have used English and Latin to name the different divisions. The Latin names , or the scientific name are more accurate and specific . Although , more difficult to pronounce and spell. Where as the more common names can be totally different from country to country and area to area . These names are "made up" and sometimes even changes in the same country or area. So this can cause a problem in identifying the same plant.
Phytologist included all the plants in one so called kingdom(group) the Kingdom Platea. They then broke them down into smaller groups. These groups based on similarities and their difference. Phytologist look at 3 things
Plants that circulate fluid are vascular and those that absorb are non-vascular.