Editing Dioscoreales (section)

=== Subdivision ===
The three families of Dioscreales constitutes about 22 genera and about 849 species{{sfn|Christenhusz|Byng|2016}} making it one of the smaller monocot orders.{{sfn|Merckx et al|2010}} Of these, the largest group is ''[[Dioscorea]]'' (yams) with about 450 species. By contrast the second largest genus is ''[[Burmannia (plant)|Burmannia]]'' with about 60 species, and most have only one or two.{{sfn|Merckx et al|2010}}

Some authors,{{sfn|Merckx|Smets|2014}} preferring the original APG (1998)families, continue to treat Thismiaceae separately from Burmanniaceae and Taccaceae from Dioscoreaceae.{{sfn|Merckx et al|2010}} But in the 2015 study of Hertwerk and colleagues, seven genera representing all three families were examined with an eight gene dataset. Dioscoreales was monophyletic and three subclades were represented corresponding to the APG families. Dioscoreaceae and Burmanniaceae were in a sister group relationship.{{sfn|Hertweck et al|2015}}

{{cladogram
| title={{anchor|Clad2}}Cladogram II: Relationship of Dioscoreales families{{sfn|Hertweck et al|2015}} (number of genera){{sfn|Christenhusz|Byng|2016}}
| align=center
| cladogram={{clade|style=font-size:92%;line-height:100%;;width:500px;

| label1=Dioscoreales
        |1={{clade
         |1={{clade
             |1= [[Dioscoreaceae]] (9)
             |2= [[Burmanniaceae]] (8)
              }}
         |2= [[Nartheciaceae]] (5)
               }}
             }}
            }}