Potentilla collina s.l. clans are plants of hybridogenous origin with usually only regional distribution. If the leaves have cusp hairs (incomplete star hairs) the parents are most probably Potentilla argentea agg. and Potentilla incana. If the leaves are without cusp hairs the second parent should be Potentilla verna.
The plant from Mannheim belongs to the latter type without cusp hairs and should be originated from Potentilla argentea agg. and Potentilla verna. As the parents it is perennial.