Geranium aedonianum a new species of Geraniaceae from Ladakh, India Author Hurrah, Imtiyaz Ahmad 0000-0003-4331-4790 Plant Diversity, Systematics and Herbarium Division, CSIR-National Botanical Research Institute, Lucknow - 226001, Uttar Pradesh, India. & Academy of Scientific and Innovative Research (AcSIR), Ghaziabad - 201002, Uttar Pradesh, India. saithimtiyaz18@gmail.com Author Wagh, Vijay Vishnu 0000-0002-6890-8862 Plant Diversity, Systematics and Herbarium Division, CSIR-National Botanical Research Institute, Lucknow - 226001, Uttar Pradesh, India. & Academy of Scientific and Innovative Research (AcSIR), Ghaziabad - 201002, Uttar Pradesh, India. waghvijay14@yahoo.com text Phytotaxa 2021 2021-03-09 489 3 241 251 http://dx.doi.org/10.11646/phytotaxa.489.3.1 journal article 10.11646/phytotaxa.489.3.1 1179-3163 5755690 Key to the species :— The species selected for the preparation of taxonomic key share various morphological resemblances with the new species but differs in other characters that are incorporated in key. 1a. Rootstock vertical; eglandular hairs upto 2.7 mm long; staminal filaments pilose on adaxial surface; mericarp reticulate without basal callus....................................................................................................................................................................... G . strictipes . 1b. Rootstock horizontal; eglandular hairs upto 1.1mm long; staminal filaments glabrous on adaxial surface; mericarp smooth with basal callus......................................................................................................................................................................................... 2. 2a. Ratio of main sinus length/middle segment length 0.76–0.85; petals purplish; cilia along margins of staminal filaments 0.1–0.6 mm long; narrow apex 2.8–4.5 mm long................................................................................................................................ G. collinum . 2b. Ratio of main sinus length/middle segment length 0.60–0.79; petals not purplish; cilia along margins of staminal filaments 0.2–0.3 mm only; narrow apex up to 9 mm long ...........................................................................................................................................3. 3a. Middle segment rhombic, 9.8 mm wide at base, 8–19 lobes; pedicel not more than 21 mm long; glandular hairs absent along the margins of staminal filaments; fruit 27–30 mm long ................................................................................................ G. himalayense . 3b. Middle segment obtrullate-obtriangular, 2.5 – 4.5 mm wide at base, 3 – 9 lobes; pedicel up to 38 mm long; glandular hairs present along the margins of the staminal filaments; fruit 38 – 40 mm long......................................................................... G. aedonianum .