Sofía Albesiano & Teresa Terrazas. 2012. Cladistic analysis of
Trichocereus (Cactaceae: Cactoideae: Trichocereeae) based on
morphological data and chloroplast DNA sequences. Haseltonia 17: 3-23.
http://www.cactusconservation.org/CCI/library/pdf/Albesiano_Terrazas_2012_Haseltonia_17_3-23.pdf
http://www.cactusconservation.org/CCI/library/pdf/Albesiano_Terrazas_2012_Haseltonia_17_3-23.pdf
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