Plantagoser.HispidulaeRahn belongs to subgen.Psyllium(Juss.) Harms sect.GnaphaloidesBarn. 5 species are recognized, they are all narrow–leaved annuals confined to the area west of the Andes.P. limensisPers. occurs in Peru;P. litoreaPhil.,P. hispidulaRuiz&Pav., andP. rancaguaSteud. in those parts of Chile with drought during the summer, andP. lundborgiiSparre on the island of San Ambrosio. Flowers are cleistogamic with small corolla lobes and small anthers, very rarely chasmogamic with larger corolla lobes and anthers. Experiments demonstrated that pollination is necessary for development of seeds in cleistogamic flowers, and that transfer of pollen from one such flower to another is almost impossibl
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