Intricate, involved, entangled, complicated, complex.
A genealogical coefficient of a given genealogical tree; defined as the difference between the number of theoretical ancestors of a person and the number of his/her real ones in a given generation (the degree of pedigree collapse).
overlapping; contorted; convoluted
Having two opposite leaves, each with one edge overlapping the nearest edge of the other.
Having a circle of several leaves or petals which overlap in that manner.