Embracing the pteridophyte classification of Ren-Chang Ching using a generic phylogeny of Chinese ferns and lycophytes On Monophyly,Paraphyly and Polyphyly Sequences of low-copy nuclear gene support the monophyly of Ostrya and paraphyly of Carpinus (Betulaceae) A critique on the “Eight_Class System” of the classification of Angiosperms proposed by Wu et al.