Knapp, Sandra & Barboza, Gloria & Bohs, Lynn & Särkinen, Tiina. (2019). A revision of the Morelloid Clade of Solanum L. (Solanaceae) in North and Central America and the Caribbean. PhytoKeys. 123. 1-144. 10.3897/phytokeys.123.31738. (Linkki)
Can this be handled as a simple taxon swap? As I read the paper by Knapp et al. (2019, p. 43 ff), it seems more complicated. They write: "The name S. americanum has been in common use in North America (e.g., Stebbins and Paddock 1949) for what is now known as S. emulans, but more recently (Schilling 1981) the two taxa have been distinguished and the name S. ptychanthum has been used for the taxon for which the oldest name is S. emulans. The type specimen of S. ptychanthum, however, falls within the variation of S. americanum, so is treated as a synonym here."
Unintended disagreements occur when a parent (B) is
thinned by swapping a child (E) to another part of the
taxonomic tree, resulting in existing IDs of the parent being interpreted
as disagreements with existing IDs of the swapped child.
Identification
ID 2 of taxon E will be an unintended disagreement with ID 1 of taxon B after the taxon swap
If thinning a parent results in more than 10 unintended disagreements, you
should split the parent after swapping the child to replace existing IDs
of the parent (B) with IDs that don't disagree.
Can this be handled as a simple taxon swap? As I read the paper by Knapp et al. (2019, p. 43 ff), it seems more complicated. They write: "The name S. americanum has been in common use in North America (e.g., Stebbins and Paddock 1949) for what is now known as S. emulans, but more recently (Schilling 1981) the two taxa have been distinguished and the name S. ptychanthum has been used for the taxon for which the oldest name is S. emulans. The type specimen of S. ptychanthum, however, falls within the variation of S. americanum, so is treated as a synonym here."