Natural hybridization and introgression in sympatric Ligularia species (Asteraceae, Senecioneae)
Jiao-Jun YU, Chiaki KURODA, Xun GONG
J Syst Evol . 2011, (5): 438 -448 .  DOI: 10.1111/j.1759-6831.2011.00150.x