Dichotomous Key/Plantae< Dichotomous Key
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The term is today generally limited to the green plants, which form an unranked clade Viridiplantae (Latin for "green plants"). This includes the flowering plants, conifers and other gymnosperms, ferns, clubmosses, hornworts, liverworts, mosses and the green algae, and excludes the red and brown algae. Historically, plants formed one of two kingdoms covering all living things that were not animals, and both algae and fungi were treated as plants; however all current definitions of "plant" exclude the fungi and some algae, as well as the prokaryotes (the archaea and bacteria).
Green plants have cell walls containing cellulose and obtain most of their energy from sunlight via photosynthesis by primary chloroplasts, derived from endosymbiosis with cyanobacteria. Their chloroplasts contain chlorophyll a and b, which gives them their green color. Some plants are parasitic and have lost the ability to produce normal amounts of chlorophyll or to photosynthesize. Plants are characterized by sexual reproduction and alternation of generations, although asexual reproduction is also common.
There are about 300–315 thousand species of plants, of which the great majority, some 260–290 thousand, are seed plants. Green plants are the basis of most of Earth's ecologies, especially on land. Plants that produce grains, fruits and vegetables form humankind's basic foodstuffs, and have been domesticated for millennia. Plants play many roles in culture. They are used as ornaments and, until recently and in great variety, they have served as the source of most medicines and drugs. The scientific study of plants is known as botany, a branch of biology.
Green algae; mostly aquatic. Chlorophyta and Charales.
Not Green algae; aquatic or terrestrial. Streptophyta / Embryophyta.
Non-vascular land plants. Bryophyta.
Vascular plants. Tracheophyta.
Spore producing plant.
Seed producing and flowering plants.
Trunk absent or branches extend from trunk.
Flowering plant. Angiosperm.
Non-flowering plant. Gnetophyte.
Leaves thin, needle-like.