Characters;"B. soffiae";"B. buenopolensis";"B. archeri";"B. purpurascens"
"Cross-sectional shape of the midrib";Truncate;Triangular;Truncate;Rounded
Raphides;Present;Absent;Absent;Absent
"Expansion tissue stratification (cell layers)";4;4;3;3
"Number of accessory bundles";14–19;26–31;8–13;20–25
"Number of accessory bundles with reinforced sheath";2;1;1;0
"Number of collateral bundles";2;2;"3 or more";"3 or more"
"Isolated or small group of fibres on mesophyll";Absent;Present;Absent;Absent
"Non-vascular fibre bundle on midrib";Absent;Present;Absent;Absent