These 350 WOX members were divided into three clades, and the first clade (also called the ancient clade) contained 98 WOXs in 47 species from lower plants to seed plants, including 7 WOXs from green algae, 3 WOXs from bryophyta, 6 WOXs from Lycopodiophyta, 1 WOX from Gnetophyta, 3 WOXs from coniferophyta, 1 WOX from
Ginkgophyta, 1 WOX from Amborella trichopoda, 13 WOXs from Liliopsida, and 63 WOXs from eudicots, which are homologous to Arabidopsis WOX10, WOX13, and WOX14.
Among the living gymnosperms, four phyla could be considered: Cycadophyta (cycads),
Ginkgophyta (Ginkgo biloba L.), Coniferophyta (conifers), and Gnetophyta (gnetophytes) [1].