Phylogeny based on the work by Novíkov & Barabaš-Krasni 2015[1] and Hao and Xue 2013[2] with plant taxon authors from Anderson, Anderson & Cleal 2007.[3]
^Anderson, Anderson & Cleal (2007). "Brief history of the gymnosperms: classification, biodiversity, phytogeography and ecology". Strelitzia. 20. SANBI: 280. ISBN978-1-919976-39-6.