TY - J Syst Evol A1 - Richard J. Abbott T1 - Plant speciation across environmental gradients and the occurrence and nature of hybrid zones Y1 - 2017-07-24 JF - Journal of Systematics and Evolution JO - J Syst Evol SP - 238 EP - 258 VL - 55 IS - 4 UR - https://www.jse.ac.cn N1 - 10.1111/jse.12267 ER -