Characters;"P. annamensis";"P. scutellifolia" Petiole;"densely pilose";"appressed downwards tomentose" Lamina;"flat, with obviously cordate base and entire or crenate margins, abaxially and adaxially densely silky";"scutellate, with slightly sinuate base and serrate margins, adaxially glabrous, abaxially sparsely strigose" Gynoecium;"densely glandular hairy on apical >2/3";"glandular hairy on apical 1/2" Stigma;"bi-lipped; lips bifid with round lobes";"upper lip absent; lower lip with slightly emarginated truncate apex"