Table 1. Sample codes, sample locations, and genetic diversity indices for 18 populations of Pterocarya hupehensis based on RAD-seq data and cpDNA data.

Code	Site	Longitude (°E)	Latitude (°N)	RAD-SNPs						cpDNA
				n	H O	H E	π	F is		h	π × 103	Haplotype (number of individuals)
n, the number of samples used for RAD-seq analysis; HO, observed heterozygosity; HE, expected heterozygosity; π, nucleotide diversity; Fis, inbreeding coefficient; h, haplotype diversity.
HH	Xian, Shaanxi	107.93	33.87	6	0.199	0.173	0.203	0.007		0	0	H1 (10)
HXC	Ankang, Shaanxi	109.49	32.72	3	0.207	0.165	0.209	0.004		0.42	0.005	H2 (1), H3 (1), H4 (7)
FLC	Ankang, Shaanxi	109.4	31.95	5	0.192	0.143	0.174	−0.033		0	0	H5 (9)
DSP	Baoji, Shaanxi	107.49	33.84	4	0.183	0.144	0.177	−0.013		0	0	H6 (8)
QDZ	Nanyang, Henan	111.97	33.52	6	0.210	0.175	0.197	−0.027		0.39	0.004	H7 (7), H8 (2)
HKC	Nanyang, Henan	112.02	33.57	6	0.193	0.184	0.209	0.033		0.5	0	H7 (6), H9 (3)
TSG	Nanyang, Henan	111.72	33.63	6	0.182	0.171	0.198	0.031		0.33	0	H7 (5), H10 (1)
LJL	Nanyang, Henan	111.70	33.63	4	0.191	0.164	0.207	0.027		0	0	H7 (4)
LYG	Tianshui, Gansu	106.1	34.23	5	0.189	0.152	0.177	0.021		0	0	H1 (10)
YPC	Longnan, Gansu	106.23	33.67	5	0.206	0.149	0.170	0.068		0	0	H11 (7)
HJG	Kangxian, Gansu	105.51	33.39	5	0.184	0.141	0.162	0.041		0	0	H12 (7)
MYG	Yangba, Gansu	105.74	33.03	6	0.191	0.170	0.196	0.010		0	0	H13 (6)
SNJ	Shennongjia, Hubei	110.92	31.65	7	0.216	0.199	0.217	0.004		0	0	H14 (7)
XJZ	Shennongjia, Hubei	110.58	31.59	11	0.209	0.209	0.220	0.033		0.47	0.067	H15 (7), H16 (3)
SHJZ	Enshi, Hubei	109.8	30.16	11	0.206	0.179	0.194	−0.026		0.76	0.067	H17 (5), H18 (1), H19 (2), H20 (1), H21 (1)
JSZ	Nanchuan, Chongqing	107.14	29.02	7	0.213	0.212	0.223	0.029		—		—
DFX	Bijie, Guizhou	105.88	27.33	12	0.224	0.212	0.222	−0.001		0.36	0.004	H22 (8), H23 (2)
NYX	Bijie, Guizhou	105.47	26.7	13	0.227	0.195	0.204	−0.047		0	0	H24 (10)
AVERAGE					0.201	0.174	0.198	−0.006		0.19	0.009