A new species of the genus Potentilla L. (Rosaceae) from the Tehran province (Iran) Author Faghir, Marzieh Beygom Department of Biology, Faculty of Science, University of Guilan, Rasht (Iran) marziegbeygomfaghir@gmail.com Author Sadeghi, Samira Department of Biology, Faculty of Science, University of Guilan, Rasht (Iran) Author Attar, Farideh School of Biology, University College of Science, University of Tehran, Tehran (Iran) text Adansonia 2021 3 2021-05-03 43 9 99 106 journal article 7092 10.5252/adansonia2021v43a9 94084051-a340-4710-833e-8cd72977880e 1639-4798 4733904 IDENTIFICATION KEY FOR POTENTILLA L. SECT. AUREAE (RYDB.) JUZ. IN IRAN 1. Radical leaves 3-foliolate; petals twice larger than sepals .................................................. P. gelida C. A. Mey. — Radical leaves 3 and 5-7 foliolate; petals not twice larger than sepals ........................................................... 2 2. Radical leaves leaflets deeply toothed, flabellate in shape, with 3-7 oblong-elliptical teeth and glabrous on the upper side ....................................................................................................................... P. geranioides Willd. — Radical leaves leaflets ± shallowly toothed, not flabellate, 3-6 teeth, oblong to ovate and suborbicular in shape; hairy on both sides ................................................................................... P. crantzii (Crantz) Beck ex Fritsch — Basal leaves and dead stipules polystichous, hairs subappressed .................................................................... 3 3. Flowering stem erect-ascending, covered with long crispate, flexuose hairs, radical leaves 3-5 foliolate, obovateoblong cuneate, with 5 pairs of oblong acute, obliquely forward pointing teeth, petiole of radical with long crispate, flexuose hairs; petals 8-10 mm ................................................. P. alborzensis Faghir & Attar , sp. nov. — Flowering stem prostrate, having long and short straight hairs; radical leaves 5 -7 foliolate, narrowly obovate, with 3-6 pairs of obovate, suborbicular directly forward pointing teeth, with long and short straight hairs; petals 10-20 mm ................................................................................................ P. adenophylla Boiss. & Hohenack.