Plantagoser.SericeaeRahn belongs to subgen.Psyllium(Juss.) Harms sect.GnaphaloidesBarn. It is distributed in the mountains from Mexico along the Andes to Argentina. Seven species are recognized:P. niveaH. B. K.,P. tolucensisPilger,P. linearisH. B. K.,P. lamprophyllaPilger,P. grandifloraMeyen,P. bismarckiiNiederlein, andP. sericeaH. B. K., the last with 7 subspecies and 3 varieties.
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