Ximnospermas: Diferenzas entre revisións
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Liña 12:
==Enlaces externos==
* Stevens, P. F. 2001 en adiante. [http://www.mobot.org/MOBOT/Research/APweb/welcome.html Angiosperm Phylogeny Website] Versión 7,
* Rydin C, Pedersen KR, Crane PR and Friis EM 2006. Former Diversity of Ephedra (Gnetales): Evidence from Early Cretaceous Seeds from Portugal and North America [http://aob.oxfordjournals.org/cgi/content/full/98/1/123 Annals of Botany 98(1):123-140]
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