For other uses, see Plant (disambiguation). Plants Fossil range: 520 Ma Pre  O S D C P T J K Pg N “ Cambrian to recent, but see text Scientific classification Domain: Eukaryota (unranked) Archaeplastida Kingdom: Plantae Haeckel, 1866[1] Divisions Green algae Chlorophyta Charophyta Land plants (embryophytes) Non-vascular land plants (bryophytes) Marchantiophytaliverworts Anthocerotophytahornworts Bryophytamosses Horneophytopsida Vascular plants (tracheophytes) Rhyniophytarhyniophytes Zosterophyllophytazosterophylls Lycopodiophytaclubmosses Trimerophytophytatrimerophytes Pteridophytaferns and horsetails Progymnospermophyta Seed plants (spermatophytes) Pteridospermatophytaseed ferns Pinophytaconifers Cycadophytacycads Ginkgophytaginkgo Gnetophytagnetae Magnoliophytaflowering plants Nematophytes Plants are living organisms belonging to the kingdom Plantae. They include familiar organisms such as trees, herbs, bushes, grasses, vines, ferns, mosses, and green algae. About 350,000 species of plants, defined as seed plants, bryophytes, ferns and fern allies, are estimated to exist currently. As of 2004, some 287,655 species had been identified, of which 258,650 are flowering and 18,000 bryophytes (see table below). Green plants, sometimes called metaphytes or viridiplantae, obtain most of their energy from sunlight via a process called photosynthesis.