The term acrodroma defines the vein of the leaves when two or more primary or secondary veins well developed form arches that are not curved at the base, which converge towards the apex.
These can be:
– with basal position when the ribs originate from the base;
– suprabasal when they diverge above and at a certain distance from the base.
According to their development we say:
– perfect when they develop at least 2/3 of the length of the lamina or reach a distance of at least 2/3 from the apex of the lamina;
– imperfect when they develop less.
Hence an acrodromic vein occurs when two or more primary veins (or highly developed secondary veins) flow in converging arcs until they meet at the apex of the leaf.