Constitutes a small group. Although they are very different from one another, they have certain similar characteristics, which are?
has xylen vessels; although they aren't ancestral to flowering plants, they have these just like flowering plants and are the only gymnosperms to have them
compound strobili: each cone ins a collection of reduced cones
nonmotile sperm: also in conifers and flowering plants
no archegonia in Gnetum and Welwitschia: another characteristic of flowering plants which doont produce archegonia