The Ancient Greek word gumnós means naked and spérma means seed, forming the term gymnosperm to describe plants with exposed seeds. These species lack an ovary to enclose their reproductive cells unlike flowering plants.
Fossil evidence dates back to the late Devonian period around 383 million years ago. Early characteristics appear in progymnosperm fossils from that era while newer phylogenetic data suggests divergence occurred during the Early Carboniferous instead.
Over 1,000 living species exist across four main divisions today including conifers which dominate with 65 genera and roughly 630 accepted names. Cycads follow with approximately 338 species found near the equator and only 95 to 100 species remain within the gnetophyte group.
The first published sequenced genome appeared in 2013 for Picea abies which is a spruce species marking a major milestone in genomic research. Most gymnosperms spend their life cycle as diploid sporophytes while the gametophyte phase remains reduced and dependent on the larger plant.
Pine fir spruce and cedar provide lumber for construction projects globally while paper production relies heavily on conifer wood pulp sources. Resin extraction generates industrial chemicals used in varnishes soaps nail polish ingredients and perfumes spanning centuries of human industry and trade.