Donysia avia (Primulaceae), a new species from Zagros Mountains, Iran Author Mehregan, Iraj 0000-0002-5108-2558 Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran. & imehregan @ srbiau. ac. ir; iraj @ daad-alumni. de; https: // orcid. org / 0000 - 0002 - 5108 - 2558 imehregan@srbiau.ac.ir Author Younesi, Simin 0000-0001-9324-9304 Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran. & simin. dionysia @ gmail. com; https: // orcid. org / 0000 - 0001 - 9324 - 9304 simin.dionysia@gmail.com Author Lidén, Magnus 0000-0001-6306-9353 Department of Systematic Biology, Uppsala University, EBC, Norbyvägen 18 D, SE- 75236, Uppsala, Sweden. & magnus. liden @ ebc. uu. se; https: // orcid. org / 0000 - 0001 - 6306 - 9353 magnus.liden@ebc.uu.se text Phytotaxa 2021 2021-07-19 511 3 296 300 http://dx.doi.org/10.11646/phytotaxa.511.3.9 journal article 10.11646/phytotaxa.511.3.9 1179-3163 5426785 Key to yellow-flowered species of Dionysia sect. Dionysia 1. Flowers in a stalked umbel; bracts foliaceous, usually larger than leaves ..................................................................... D. caespitosa - Flowers sessile, single; bracts shorter and narrower than leaves .......................................................................................................2 2. Early leaves 3–5 times longer than terminal leaves; corolla glabrous; ovules more than 15............................................................... D. bachtiarica - Leaves not strongly anisophyllous; corolla hairy; ovules 3 to 10 ......................................................................................................3 3. Leaves entire with prominent eglandular hairs; glands sparse, minute and subsessile, or absent .....................................................4 - Leaves entire or lobed, with or without eglandular hairs; glands prominent, subsessile to stalked..................................................... the remaining 13 species: D. crista-gallii , D. diapensiifolia sensu lato , D. drabifolia , D. gaubae , D. haussknechtii , D. iranica , D. khuzistanica , D. odora , D. robusta , D. sarvestanica , D. tacamahaca , D. zagrica , D. zetterlundii 4. Leaves evenly covered with up to 0.2 mm long, straight acute hairs.............................................................................. D. michauxii - Leaves with 0.4–0.7 mm long coarse curly hairs, forming a marginal fringe....................................................................................5 5. Leaves less than 4 mm ; leaves eglandular.................................................................................................................... D. lamingtonii - Leaves up to 10 mm ; leaves with small subsessile glands ....................................................................................................... D. avia