Gnetophyta

Gnetophyta edo gnetophytes gimnospermoren dibisio bat da

Taxonomia 

Gaur egun Gnetophytak hiru genero ditu:
 Gnetum
 Welwitschia
 Ephedra

Gnetum adibidez: Gnetum gnemon (haziak jangarriak).

Welwitschia espezie bat: Welwitschia mirabilis. basamortuan bizi da, Namibian eta Angolan.

Ephedra (batzuk sandabelarra dira, efedrina).

Erreferentziak 

 Burleigh, J. G., and S. Mathews. 2004. Phylogenetic signal in nucleotide data from seed plants: implications for resolving the seed plant tree of life. American Journal of Botany 91: 1599-1613 (abstract)
 Gifford, Ernest M., Adriance S. Foster. 1989. Morphology and Evolution of Vascular Plants. Third edition. WH Freeman and Company, New York.
 Hilton, Jason, and Richard M. Bateman. 2006. Pteridosperms are the backbone of seed-plant phylogeny. Journal of the Torrey Botanical Society 133: 119-168 (abstract)