The Treatment of the Monocotyledons in an Evolutionary System of Classification

摘要: The more characters to distinguish monocotyledons and dicotyledons that are taken into consideration, the numerous become families which exhibit both mono- dicotyledonous characters. In particular, ranalean appear intimately related gaps between them do not allow a distinction classes be made. author, therefore, considers as two extreme wings of single natural unit, with Annonaceae, Aristolochiaceae, Nymphaeaceae, Piperaceae connecting links. Within monocotyledonous wing, 12 units higher than ordinal level (superorders) may tentatively recognized arranged according number features they possess degree their systematic isolation. Whereas groups present at least few clearly (like Arales Helobiae) occupy isolated position, reduction or absence (as in anemophilous monocotyledons) is accompanied by decreasing This indicates among have attained high evolutionary level, convergence largely camouflages relationship.