Aristolochia rethyae, a new species from Arunachal Pradesh, north-east India Author Kashung, Soyala 0000-0001-9765-3937 Forest Systematic & Ethnobiology Laboratory, Department of Forestry, North Eastern Regional Institute of Science and Technology, Nirjuli 791 109, Arunachal Pradesh, India & ksoyala @ gmail. com; https: // orcid. org / 0000 - 0001 - 9765 - 3937 ksoyala@gmail.com Author Gajurel, Padma Raj 0000-0002-0152-1540 Forest Systematic & Ethnobiology Laboratory, Department of Forestry, North Eastern Regional Institute of Science and Technology, Nirjuli 791 109, Arunachal Pradesh, India & prgajurel @ gmail. com; https: // orcid. org / 0000 - 0002 - 0152 - 1540 prgajurel@gmail.com Author Singh, Binay 0000-0003-0875-8783 Forest Systematic & Ethnobiology Laboratory, Department of Forestry, North Eastern Regional Institute of Science and Technology, Nirjuli 791 109, Arunachal Pradesh, India & bsingh. nird @ gmail. com; https: // orcid. org / 0000 - 0003 - 0875 - 8783 bsingh.nird@gmail.com Author Barman, Rimi 0000-0002-8816-1217 Forest Systematic & Ethnobiology Laboratory, Department of Forestry, North Eastern Regional Institute of Science and Technology, Nirjuli 791 109, Arunachal Pradesh, India & rimibarman 94 @ gmail. com; https: // orcid. org / 0000 - 0002 - 8816 - 1217 rimibarman94@gmail.com Author Yakang, Tage 0000-0002-6416-662X Forest Systematic & Ethnobiology Laboratory, Department of Forestry, North Eastern Regional Institute of Science and Technology, Nirjuli 791 109, Arunachal Pradesh, India & tage. yakang 17 @ gmail. com; https: // orcid. org / 0000 - 0002 - 6416 - 662 X tage.yakang17@gmail.com text Phytotaxa 2022 2022-09-14 564 1 1 7 journal article 142530 10.11646/phytotaxa.564.1.1 366c19db-ebef-4e26-9cc5-ebb52c4df664 1179-3163 7077725 Indian Siphisia With the addition of the present new species, the number of Siphisia species in India has become eight. A key for identification of the Indian species in the subgenus Siphisia is given below. Keys to the Indian species of Aristolochia in subgen. Siphisia 1a. Limbs saccate, lobe distinct............................................................................................................................................. A. transsecta 1b. Limbs not saccate, lobe distinct or indistinct .....................................................................................................................................2 2a. Limbs bell or trumpet shaped, lobe margin distinctly revolute..........................................................................................................3 2b. Limbs abruptly discoid, lobe margin slightly or non-revolute ...........................................................................................................5 3a. Leaves palmately 3-lobed ............................................................................................................................................. A. platanifolia 3b. Leaves entire.......................................................................................................................................................................................4 4a. Perianth tube 1.5–2 cm long, limb nearly rounded ............................................................................................................. A. saccata 4b. Perianth tube 3–4 cm long, limb nearly rectangular......................................................................................................... A. cathcartii 5a. Flowers on old branches, cauliflorous................................................................................................................................................6 5b. Flowers on young branches, ramiflorous ...........................................................................................................................................7 6a. Flowers in cluster, capsule densely pubescent, apex stipitate ............................................................................................. A. rethyae 6b. Flowers solitary and axillary, capsule lightly pubescent, apex folded ............................................................................... A. griffithii 7a. Perianth glabrescent, limb indistinctly 3-lobed.................................................................................................................. A. dilatata 7b. Perianth villous, limb distinctly 3-lobed ...................................................................................................................... A. punjabensis