There are approximately 28 species and subspecies in this genus: P. alanbanneri · P. alaskensis · P. aotea · P. atypica · P. aviculata · P. bispinosa · P. california · P. californica · P. collifera · P. crosslandi · P. decorata · P. delicatula · P. egyptiaca · P. elongata · P. erecta · P. jeffreysi · P. livingstonei · P. marsupialis · P. parsevaliformis · P. parsevalii · P. projecta · P. raigiformis · P. serrula · P. signata · P. spathulata · P. trispinosa · P. tropica · P. tubula
Accessed through GBIF Data Portal March 18, 2008:
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