Observations regarding the frequency of hybrids in the subtribe are also given.
Mauricio Diazgranados 2012, 'A nomenclator for the frailejones (Espeletiinae Cuatrec., Asteraceae)', PhytoKeyshttp://phytokeys.pensoft.net/lib/ajax_srv/article_elements_srv.php?action=download_pdf&item_id=1436. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The genera belonging to this subtribe are commonly very rich in number of species and their systematics envolves huge difficulties.
Marcos Kogan 1963, 'Contribuição ao conhecimento da sistemática e biologia de buprestídeos minadores dogênero Pachyschelus Solier, 1833: (Coleoptera, Buprestidae)', Memórias do Instituto Oswaldo Cruz.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02761963000300003. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)