References
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Penneckamp et al.
Penneckamp, , D , Chaura, R , Rojas, G. and Stuessy, T. 2020. Taxonomic notes on Plectocephalus (Centaurea) s.l., Centaureinae, Asteraceae) from Chile, including new combinations and synonyms. Phytotaxa 437(4) 227-246