BBiosystematic studies on XanthiumBiosystematic studies on Xanthiumde Doris Löve, Pierre DansereauEdiciones (1)Biosystematic studies on Xanthium (1959)inglésMás obras de Doris LöveNNorth Atlantic Biota and Their HistoryNorth Atlantic Biota and Their HistoryAA plant collection from SW YukonA plant collection from SW YukonPPoa AgassizensisPoa Agassizensis
CCirsium flodmani (Rydb.) Arth. f. albiflorum forma novaCirsium flodmani (Rydb.) Arth. f. albiflorum forma nova