Nigel P. Barker, H. Peter Linder, Cynthia M. Morton, Mark Lyle, The Paraphyly of Cortaderia (Danthonioideae; Poaceae): Evidence from Morphology and Chloroplast and Nuclear DNA Sequence Data, Annals of the Missouri Botanical Garden, Vol. 90, No. 1 (Winter, 2003), pp. 1-24
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Barker et al. (2003) studied this question.