|Classification System: APG IV|
Note: Comparison of materials of P. polycarpa at SING (Singapore Herbarium) and the holotype of P. dominantinervium shows that they are conspecific (Suwanphakdee and Chantaranothai, 2008). Therefore, P. dominantinervium named by Chaveerach et al. (2006) is considered to be the synonym of P. polycarpa. According to the priority rule of ICBN (see Simpson, 2006), P. dominantinervium should be rejected as it is a illiegimate name (contary to the rule of ICBN) and P. polycarpa is the valid name.
- Chaveerach, A., Sudmoon, R., Tanee, T. and Mokkamul, P. 2006. Three new species of Piperaceae from Thailand. Acta Phytotaxonomica Sinica 44(4): 447–453. 
- Simpson, M.G. 2006. Plant Systematics. (Chapter 16 Plant Nomenclature). Elsevier Academic Press, Burlington, MA. pp.501-514.
- Suwanphakdee, C. and Chantaranothai, P. 2008. A further note on the genus Piper L. (Piperaceae) from Thailand. Natural History Journal of Chulalongkorn University 8(2): 205–209.