Table 2: Matrix of hybridization distances ; see text for details) between all pairs of sympatric and allopatric populations. Above the diagonal, hybrids were identified using the “80–20” criterion; below the diagonal, hybrids were identified using the “90–10” criterion.

MT: Custer NF no.1 WY: Bighorn NF no.1 WY: Bighorn NF no.2 CO: Roosevelt NF MT: Custer NF no.2 WY: Medicine Bow NF ND: Little Missouri NG SD: Custer NF WY: Sand Creek NE: White River SD: Black Hills NF NE: Ponderosa SWMA SD: TNC Whitney Preserve NE: Nebraska NF SD: Ft. Meade NRA NE: Nenzel NE: TNC Niobrara Valley Preserve SD: Carpenter GPA ND: TNC Pigeon Point Preserve NE: Wiseman SWA SD: Newton Hills GPA

MT: Custer NF no. 10.000.000.070.000.000.000.000.320.190.100.290.000.130.500.881.000.961.001.001.00
WY: Bighorn NF no. 10.000.000.070.000.000.000.000.320.190.100.290.000.130.500.881.000.961.001.001.00
WY: Bighorn NF no. 20.000.000.000.000.000.000.000.320.190.100.290.000.130.500.881.000.961.001.001.00
CO: Roosevelt NF0.070.070.070.070.070.070.070.250.120.030.210.070.050.430.800.930.890.930.930.93
MT: Custer NF no. 20.000.000.000.070.000.000.000.320.190.100.290.000.130.500.881.000.961.001.001.00
WY: Medicine Bow NF0.000.000.000.070.000.000.000.320.190.100.290.000.130.500.881.000.961.001.001.00
ND: Little Missouri NG0.000.000.000.070.000.000.000.320.190.100.290.000.130.500.881.000.961.001.001.00
SD: Custer NF0.000.000.000.070.000.000.000.320.190.100.290.000.130.500.881.000.961.001.001.00
WY: Sand Creek0.320.320.320.250.320.320.320.320.130.220.040.320.200.180.550.680.640.680.680.68
NE: White River0.250.250.250.180.250.250.250.250.070.090.100.190.060.310.690.810.770.810.810.81
SD: Black Hills NF0.100.100.100.030.100.100.100.100.220.150.190.100.030.400.780.900.860.900.900.90
NE: Ponderosa SWMA0.500.500.500.430.500.500.500.500.180.250.400.290.160.210.590.710.680.710.710.71
SD: TNC Whitney Preserve0.000.000.000.070.000.000.000.000.320.250.100.500.130.500.881.000.961.001.001.00
NE: Nebraska NF0.500.500.500.430.500.500.500.500.180.250.400.000.500.380.750.880.840.880.880.88
SD: Ft. Meade NRA0.500.500.500.430.500.500.500.500.180.250.400.000.500.000.380.500.460.500.500.50
NE: Nenzel0.880.880.880.800.880.880.880.880.550.630.780.380.880.380.380.130.090.130.130.13
NE: TNC Niobrara Valley Preserve1.001.001.000.931.001.001.001.000.680.750.900.501.000.500.500.130.040.000.000.00
SD: Carpenter GPA0.960.960.960.890.960.960.960.960.640.710.860.460.960.460.460.090.040.040.040.04
ND: TNC Pigeon Point Preserve1.001.001.000.931.001.001.001.000.680.750.900.501.000.500.500.130.000.040.000.00
NE: Wiseman SWA1.001.001.000.931.001.001.001.000.680.750.900.501.000.500.500.130.000.040.000.00
SD: Newton Hills GPA0.960.960.960.890.960.960.960.960.640.710.860.460.960.460.460.090.040.000.040.04