1. Bornstein JA (1989) Taxonomic studies of the Piperaceae. J Arnold Arbor 70:1–55
2. Burger WC (1972) The evolutionary trends in the central american species of Piper (Piperaceae). Brittonia 24:356–362
3. Gajurel PR, Rethy P, Kumar Y, Singh B (2008) Piper species (Piperaceae) of North-East India (Arunachal Pradesh). Bishen Singh Mahendra Pal Singh, Dehra Dun
4. Hoogendijk M, Williams DE (2001) Characterizing the genetic diversity of home garden crops: some examples from the Americas. In: Watson JW, Eyzaguirre PB (ed) Home gardens and in situ conservation of plant genetic resources in farming systems. IPGRI: Proceedings of the second international home gardens workshop, Witzenhausen, Germany, pp 34–40
5. Huber H, Hutchings MJ (1997) Differential response to shading in Orthotropic and Plagiotropic shoots of the clonal herb. Glechoma Hirsuta Oecologia 112(4):485–491. https://doi.org/10.1007/s004420050336