Habka dhirtu waa Gnetopsida. Gnetopsida waxaa iska leh madaxa Tracheophyta, iyo boqortooyada dhirta. Amarka Gnetopsida wuxuu daboolayaa 117 nooc, marka loo eego Buugga Nolosha.
Kaladogaram ayaa lagu sheegay Buugga Nolosha:
- Roskov Y., Kunze T., Orrell T., Abucay L., Paglinawan L., Culham A., Bailly N., Kirk P., Bourgoin T., Baillargeon G., Decock W., De Wever A., Didžiulis V. (ed). "Nuqul Archive". Species 2000: Naturalis, Leiden, the Netherlands. ISSN 2405-884X. TaxonID: 54776941. Waxaa laga kaydiyay the original 2019-12-18. Soo qaatay 2019-11-11.