Three new species, two new records and additional taxonomic notes of Piper (Piperaceae) from Thailand

We revised the genus Piper (Piperaceae) for the forthcoming volume of the Flora of Thailand. Three new species, namely P. kerrii, P. phangngaense and P. rugocarpum are described and illustrated. In addition, two records of species new to Thailand, P. laosanum and P. obtusissimum, are presented. New complete taxonomic descriptions of P. crassipes and P. obtusissimum are provided. We also designate lectotypes and epitypes of P. laosanum and P. obtusissimum, respectively. An emended key to species including the new species, new records for Thai Piper species and additional taxonomic notes are provided.