According to Eriksson et al. (2003) "The previously used genera Duchesnea (Potentilla indica), Horkelia, and Ivesia are strongly supported as nested within Potentilla". This treatment is followed by the New England Wild Flower Society's Flora Novae Angliae
Torsten Eriksson, Malin S. Hibbs, Anne D. Yoder, Charles F. Delwiche, and Michael J. Donoghue (2003). "The Phylogeny of Rosoideae (Rosaceae) Based on Sequences of the Internal Transcribed Spacers (ITS) of Nuclear Ribosomal DNA and the trnL/F Region of Chloroplast DNA". Int. J Plant Sci. 164 (2): 197–211. doi:10.1086/346163. (Link)
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.
Ugh, so we're veering away from Jepson on this one?