Parent taxon: Embryophyta according to E. Taylor et al. 2008
See also Shoshani et al. 1989
Sister taxa: Antherocerotophyta, Anthocerotophyta, Cycadophyta, Gigantopteridales, Ginkgophyta, Hermanophytales, Iraniales, Lycophyta, Progymnospermophyta, Pteridospermophyta, Sphenophyta, Zosterophyllophyta
Subtaxa: Abietoxylon Abiocaulis Albertia Alloxylon Anomaloxylon Arctoxylon Benstedtia Borysthenia Callitrites Calloxylon Cedrophloios Ceratostrobus Cheirostrobus Cladocupressoxylon Coniferales Coniferoxylon Cordaitales Cormaraucarioxylon Cormocedroxylon Cormocupressoxylon Cryptomerites Cupressoxylon Cycadocarpidium Dammarophyllum Dictyodendron Eleoxylon Eurysacis Germaria Glyptolepidium Glyptostroboxylon Hiltonia Krauselcladus Lebachia Legnophora Legnophora girardi Libocedrites Lutuginia Macrostachya Metacedroxylon Paleotaxites Paraphyllocladoxylon Parapinuxylon Phleboxylon Phyllocladopitys Phyllostrobus Pityites Pityocladus Planoxylon Platyspiroxylon Protobrachyoxylon Protocedroxylon Protojuniperoxylon Protopiceoxylon Protopinuxylon Protopodocarpoxylon Pseudoaraucarites Pseudotaxodioxylon Retinoxylon Rhizocedroxylon Rhizotaxodioxylon Sboromirskia Spiroxylon Storgaardia Swedenborgia Taxeopsis Taxoxylon Taxoxylum Thylloxylon Trematoxylon Walchia Walchiostrobus Zamioidea